mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-24 02:30:51 +00:00
1880 lines
76 KiB
C++
1880 lines
76 KiB
C++
#include "ClusterCopier.h"
|
|
|
|
#include "Internals.h"
|
|
|
|
namespace DB
|
|
{
|
|
|
|
|
|
using ConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;
|
|
|
|
static ConfigurationPtr getConfigurationFromXMLString(const std::string & xml_data)
|
|
{
|
|
std::stringstream ss(xml_data);
|
|
Poco::XML::InputSource input_source{ss};
|
|
return {new Poco::Util::XMLConfiguration{&input_source}};
|
|
}
|
|
|
|
|
|
class ClusterCopier
|
|
{
|
|
public:
|
|
|
|
ClusterCopier(String task_path_,
|
|
String host_id_,
|
|
String proxy_database_name_,
|
|
Context & context_)
|
|
:
|
|
task_zookeeper_path(std::move(task_path_)),
|
|
host_id(std::move(host_id_)),
|
|
working_database_name(std::move(proxy_database_name_)),
|
|
context(context_),
|
|
log(&Poco::Logger::get("ClusterCopier"))
|
|
{
|
|
}
|
|
|
|
void init()
|
|
{
|
|
auto zookeeper = context.getZooKeeper();
|
|
|
|
task_description_watch_callback = [this] (const Coordination::WatchResponse & response)
|
|
{
|
|
if (response.error != Coordination::ZOK)
|
|
return;
|
|
UInt64 version = ++task_descprtion_version;
|
|
LOG_DEBUG(log, "Task description should be updated, local version " << version);
|
|
};
|
|
|
|
task_description_path = task_zookeeper_path + "/description";
|
|
task_cluster = std::make_unique<TaskCluster>(task_zookeeper_path, working_database_name);
|
|
|
|
reloadTaskDescription();
|
|
task_cluster_initial_config = task_cluster_current_config;
|
|
|
|
task_cluster->loadTasks(*task_cluster_initial_config);
|
|
context.setClustersConfig(task_cluster_initial_config, task_cluster->clusters_prefix);
|
|
|
|
/// Set up shards and their priority
|
|
task_cluster->random_engine.seed(task_cluster->random_device());
|
|
for (auto & task_table : task_cluster->table_tasks)
|
|
{
|
|
task_table.cluster_pull = context.getCluster(task_table.cluster_pull_name);
|
|
task_table.cluster_push = context.getCluster(task_table.cluster_push_name);
|
|
task_table.initShards(task_cluster->random_engine);
|
|
}
|
|
|
|
LOG_DEBUG(log, "Will process " << task_cluster->table_tasks.size() << " table tasks");
|
|
|
|
/// Do not initialize tables, will make deferred initialization in process()
|
|
|
|
zookeeper->createAncestors(getWorkersPathVersion() + "/");
|
|
zookeeper->createAncestors(getWorkersPath() + "/");
|
|
}
|
|
|
|
template <typename T>
|
|
decltype(auto) retry(T && func, UInt64 max_tries = 100)
|
|
{
|
|
std::exception_ptr exception;
|
|
|
|
for (UInt64 try_number = 1; try_number <= max_tries; ++try_number)
|
|
{
|
|
try
|
|
{
|
|
return func();
|
|
}
|
|
catch (...)
|
|
{
|
|
exception = std::current_exception();
|
|
if (try_number < max_tries)
|
|
{
|
|
tryLogCurrentException(log, "Will retry");
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::rethrow_exception(exception);
|
|
}
|
|
|
|
|
|
void discoverShardPartitions(const ConnectionTimeouts & timeouts, const TaskShardPtr & task_shard)
|
|
{
|
|
TaskTable & task_table = task_shard->task_table;
|
|
|
|
LOG_INFO(log, "Discover partitions of shard " << task_shard->getDescription());
|
|
|
|
auto get_partitions = [&] () { return getShardPartitions(timeouts, *task_shard); };
|
|
auto existing_partitions_names = retry(get_partitions, 60);
|
|
Strings filtered_partitions_names;
|
|
Strings missing_partitions;
|
|
|
|
/// Check that user specified correct partition names
|
|
auto check_partition_format = [] (const DataTypePtr & type, const String & partition_text_quoted)
|
|
{
|
|
MutableColumnPtr column_dummy = type->createColumn();
|
|
ReadBufferFromString rb(partition_text_quoted);
|
|
|
|
try
|
|
{
|
|
type->deserializeAsTextQuoted(*column_dummy, rb, FormatSettings());
|
|
}
|
|
catch (Exception & e)
|
|
{
|
|
throw Exception("Partition " + partition_text_quoted + " has incorrect format. " + e.displayText(), ErrorCodes::BAD_ARGUMENTS);
|
|
}
|
|
};
|
|
|
|
if (task_table.has_enabled_partitions)
|
|
{
|
|
/// Process partition in order specified by <enabled_partitions/>
|
|
for (const String & partition_name : task_table.enabled_partitions)
|
|
{
|
|
/// Check that user specified correct partition names
|
|
check_partition_format(task_shard->partition_key_column.type, partition_name);
|
|
|
|
auto it = existing_partitions_names.find(partition_name);
|
|
|
|
/// Do not process partition if it is not in enabled_partitions list
|
|
if (it == existing_partitions_names.end())
|
|
{
|
|
missing_partitions.emplace_back(partition_name);
|
|
continue;
|
|
}
|
|
|
|
filtered_partitions_names.emplace_back(*it);
|
|
}
|
|
|
|
for (const String & partition_name : existing_partitions_names)
|
|
{
|
|
if (!task_table.enabled_partitions_set.count(partition_name))
|
|
{
|
|
LOG_DEBUG(log, "Partition " << partition_name << " will not be processed, since it is not in "
|
|
<< "enabled_partitions of " << task_table.table_id);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (const String & partition_name : existing_partitions_names)
|
|
filtered_partitions_names.emplace_back(partition_name);
|
|
}
|
|
|
|
for (const String & partition_name : filtered_partitions_names)
|
|
{
|
|
task_shard->partition_tasks.emplace(partition_name, ShardPartition(*task_shard, partition_name));
|
|
task_shard->checked_partitions.emplace(partition_name, true);
|
|
}
|
|
|
|
if (!missing_partitions.empty())
|
|
{
|
|
std::stringstream ss;
|
|
for (const String & missing_partition : missing_partitions)
|
|
ss << " " << missing_partition;
|
|
|
|
LOG_WARNING(log, "There are no " << missing_partitions.size() << " partitions from enabled_partitions in shard "
|
|
<< task_shard->getDescription() << " :" << ss.str());
|
|
}
|
|
|
|
LOG_DEBUG(log, "Will copy " << task_shard->partition_tasks.size() << " partitions from shard " << task_shard->getDescription());
|
|
}
|
|
|
|
/// Compute set of partitions, assume set of partitions aren't changed during the processing
|
|
void discoverTablePartitions(const ConnectionTimeouts & timeouts, TaskTable & task_table, UInt64 num_threads = 0)
|
|
{
|
|
/// Fetch partitions list from a shard
|
|
{
|
|
ThreadPool thread_pool(num_threads ? num_threads : 2 * getNumberOfPhysicalCPUCores());
|
|
|
|
for (const TaskShardPtr & task_shard : task_table.all_shards)
|
|
thread_pool.scheduleOrThrowOnError([this, timeouts, task_shard]() { discoverShardPartitions(timeouts, task_shard); });
|
|
|
|
LOG_DEBUG(log, "Waiting for " << thread_pool.active() << " setup jobs");
|
|
thread_pool.wait();
|
|
}
|
|
}
|
|
|
|
void uploadTaskDescription(const std::string & task_path, const std::string & task_file, const bool force)
|
|
{
|
|
auto local_task_description_path = task_path + "/description";
|
|
|
|
String task_config_str;
|
|
{
|
|
ReadBufferFromFile in(task_file);
|
|
readStringUntilEOF(task_config_str, in);
|
|
}
|
|
if (task_config_str.empty())
|
|
return;
|
|
|
|
auto zookeeper = context.getZooKeeper();
|
|
|
|
zookeeper->createAncestors(local_task_description_path);
|
|
auto code = zookeeper->tryCreate(local_task_description_path, task_config_str, zkutil::CreateMode::Persistent);
|
|
if (code && force)
|
|
zookeeper->createOrUpdate(local_task_description_path, task_config_str, zkutil::CreateMode::Persistent);
|
|
|
|
LOG_DEBUG(log, "Task description " << ((code && !force) ? "not " : "") << "uploaded to " << local_task_description_path << " with result " << code << " ("<< zookeeper->error2string(code) << ")");
|
|
}
|
|
|
|
void reloadTaskDescription()
|
|
{
|
|
auto zookeeper = context.getZooKeeper();
|
|
task_description_watch_zookeeper = zookeeper;
|
|
|
|
String task_config_str;
|
|
Coordination::Stat stat{};
|
|
int code;
|
|
|
|
zookeeper->tryGetWatch(task_description_path, task_config_str, &stat, task_description_watch_callback, &code);
|
|
if (code)
|
|
throw Exception("Can't get description node " + task_description_path, ErrorCodes::BAD_ARGUMENTS);
|
|
|
|
LOG_DEBUG(log, "Loading description, zxid=" << task_description_current_stat.czxid);
|
|
auto config = getConfigurationFromXMLString(task_config_str);
|
|
|
|
/// Setup settings
|
|
task_cluster->reloadSettings(*config);
|
|
context.getSettingsRef() = task_cluster->settings_common;
|
|
|
|
task_cluster_current_config = config;
|
|
task_description_current_stat = stat;
|
|
}
|
|
|
|
void updateConfigIfNeeded()
|
|
{
|
|
UInt64 version_to_update = task_descprtion_version;
|
|
bool is_outdated_version = task_descprtion_current_version != version_to_update;
|
|
bool is_expired_session = !task_description_watch_zookeeper || task_description_watch_zookeeper->expired();
|
|
|
|
if (!is_outdated_version && !is_expired_session)
|
|
return;
|
|
|
|
LOG_DEBUG(log, "Updating task description");
|
|
reloadTaskDescription();
|
|
|
|
task_descprtion_current_version = version_to_update;
|
|
}
|
|
|
|
void process(const ConnectionTimeouts & timeouts)
|
|
{
|
|
for (TaskTable & task_table : task_cluster->table_tasks)
|
|
{
|
|
LOG_INFO(log, "Process table task " << task_table.table_id << " with "
|
|
<< task_table.all_shards.size() << " shards, " << task_table.local_shards.size() << " of them are local ones");
|
|
|
|
if (task_table.all_shards.empty())
|
|
continue;
|
|
|
|
/// Discover partitions of each shard and total set of partitions
|
|
if (!task_table.has_enabled_partitions)
|
|
{
|
|
/// If there are no specified enabled_partitions, we must discover them manually
|
|
discoverTablePartitions(timeouts, task_table);
|
|
|
|
/// After partitions of each shard are initialized, initialize cluster partitions
|
|
for (const TaskShardPtr & task_shard : task_table.all_shards)
|
|
{
|
|
for (const auto & partition_elem : task_shard->partition_tasks)
|
|
{
|
|
const String & partition_name = partition_elem.first;
|
|
task_table.cluster_partitions.emplace(partition_name, ClusterPartition{});
|
|
}
|
|
}
|
|
|
|
for (auto & partition_elem : task_table.cluster_partitions)
|
|
{
|
|
const String & partition_name = partition_elem.first;
|
|
|
|
for (const TaskShardPtr & task_shard : task_table.all_shards)
|
|
task_shard->checked_partitions.emplace(partition_name);
|
|
|
|
task_table.ordered_partition_names.emplace_back(partition_name);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/// If enabled_partitions are specified, assume that each shard has all partitions
|
|
/// We will refine partition set of each shard in future
|
|
|
|
for (const String & partition_name : task_table.enabled_partitions)
|
|
{
|
|
task_table.cluster_partitions.emplace(partition_name, ClusterPartition{});
|
|
task_table.ordered_partition_names.emplace_back(partition_name);
|
|
}
|
|
}
|
|
|
|
task_table.watch.restart();
|
|
|
|
/// Retry table processing
|
|
bool table_is_done = false;
|
|
for (UInt64 num_table_tries = 0; num_table_tries < max_table_tries; ++num_table_tries)
|
|
{
|
|
if (tryProcessTable(timeouts, task_table))
|
|
{
|
|
table_is_done = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!table_is_done)
|
|
{
|
|
throw Exception("Too many tries to process table " + task_table.table_id + ". Abort remaining execution",
|
|
ErrorCodes::UNFINISHED);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Disables DROP PARTITION commands that used to clear data after errors
|
|
void setSafeMode(bool is_safe_mode_ = true)
|
|
{
|
|
is_safe_mode = is_safe_mode_;
|
|
}
|
|
|
|
void setCopyFaultProbability(double copy_fault_probability_)
|
|
{
|
|
copy_fault_probability = copy_fault_probability_;
|
|
}
|
|
|
|
|
|
protected:
|
|
|
|
String getWorkersPath() const
|
|
{
|
|
return task_cluster->task_zookeeper_path + "/task_active_workers";
|
|
}
|
|
|
|
String getWorkersPathVersion() const
|
|
{
|
|
return getWorkersPath() + "_version";
|
|
}
|
|
|
|
String getCurrentWorkerNodePath() const
|
|
{
|
|
return getWorkersPath() + "/" + host_id;
|
|
}
|
|
|
|
zkutil::EphemeralNodeHolder::Ptr createTaskWorkerNodeAndWaitIfNeed(
|
|
const zkutil::ZooKeeperPtr & zookeeper,
|
|
const String & description,
|
|
bool unprioritized)
|
|
{
|
|
std::chrono::milliseconds current_sleep_time = default_sleep_time;
|
|
static constexpr std::chrono::milliseconds max_sleep_time(30000); // 30 sec
|
|
|
|
if (unprioritized)
|
|
std::this_thread::sleep_for(current_sleep_time);
|
|
|
|
String workers_version_path = getWorkersPathVersion();
|
|
String workers_path = getWorkersPath();
|
|
String current_worker_path = getCurrentWorkerNodePath();
|
|
|
|
UInt64 num_bad_version_errors = 0;
|
|
|
|
while (true)
|
|
{
|
|
updateConfigIfNeeded();
|
|
|
|
Coordination::Stat stat{};
|
|
zookeeper->get(workers_version_path, &stat);
|
|
auto version = stat.version;
|
|
zookeeper->get(workers_path, &stat);
|
|
|
|
if (static_cast<UInt64>(stat.numChildren) >= task_cluster->max_workers)
|
|
{
|
|
LOG_DEBUG(log, "Too many workers (" << stat.numChildren << ", maximum " << task_cluster->max_workers << ")"
|
|
<< ". Postpone processing " << description);
|
|
|
|
if (unprioritized)
|
|
current_sleep_time = std::min(max_sleep_time, current_sleep_time + default_sleep_time);
|
|
|
|
std::this_thread::sleep_for(current_sleep_time);
|
|
num_bad_version_errors = 0;
|
|
}
|
|
else
|
|
{
|
|
Coordination::Requests ops;
|
|
ops.emplace_back(zkutil::makeSetRequest(workers_version_path, description, version));
|
|
ops.emplace_back(zkutil::makeCreateRequest(current_worker_path, description, zkutil::CreateMode::Ephemeral));
|
|
Coordination::Responses responses;
|
|
auto code = zookeeper->tryMulti(ops, responses);
|
|
|
|
if (code == Coordination::ZOK || code == Coordination::ZNODEEXISTS)
|
|
return std::make_shared<zkutil::EphemeralNodeHolder>(current_worker_path, *zookeeper, false, false, description);
|
|
|
|
if (code == Coordination::ZBADVERSION)
|
|
{
|
|
++num_bad_version_errors;
|
|
|
|
/// Try to make fast retries
|
|
if (num_bad_version_errors > 3)
|
|
{
|
|
LOG_DEBUG(log, "A concurrent worker has just been added, will check free worker slots again");
|
|
std::chrono::milliseconds random_sleep_time(std::uniform_int_distribution<int>(1, 1000)(task_cluster->random_engine));
|
|
std::this_thread::sleep_for(random_sleep_time);
|
|
num_bad_version_errors = 0;
|
|
}
|
|
}
|
|
else
|
|
throw Coordination::Exception(code);
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Checks that the whole partition of a table was copied. We should do it carefully due to dirty lock.
|
|
* State of some task could change during the processing.
|
|
* We have to ensure that all shards have the finished state and there is no dirty flag.
|
|
* Moreover, we have to check status twice and check zxid, because state can change during the checking.
|
|
*/
|
|
bool checkPartitionIsDone(const TaskTable & task_table, const String & partition_name, const TasksShard & shards_with_partition)
|
|
{
|
|
LOG_DEBUG(log, "Check that all shards processed partition " << partition_name << " successfully");
|
|
|
|
auto zookeeper = context.getZooKeeper();
|
|
|
|
Strings status_paths;
|
|
for (auto & shard : shards_with_partition)
|
|
{
|
|
ShardPartition & task_shard_partition = shard->partition_tasks.find(partition_name)->second;
|
|
status_paths.emplace_back(task_shard_partition.getShardStatusPath());
|
|
}
|
|
|
|
std::vector<int64_t> zxid1, zxid2;
|
|
|
|
try
|
|
{
|
|
std::vector<zkutil::ZooKeeper::FutureGet> get_futures;
|
|
for (const String & path : status_paths)
|
|
get_futures.emplace_back(zookeeper->asyncGet(path));
|
|
|
|
// Check that state is Finished and remember zxid
|
|
for (auto & future : get_futures)
|
|
{
|
|
auto res = future.get();
|
|
|
|
TaskStateWithOwner status = TaskStateWithOwner::fromString(res.data);
|
|
if (status.state != TaskState::Finished)
|
|
{
|
|
LOG_INFO(log, "The task " << res.data << " is being rewritten by " << status.owner << ". Partition will be rechecked");
|
|
return false;
|
|
}
|
|
|
|
zxid1.push_back(res.stat.pzxid);
|
|
}
|
|
|
|
// Check that partition is not dirty
|
|
{
|
|
CleanStateClock clean_state_clock (
|
|
zookeeper,
|
|
task_table.getPartitionIsDirtyPath(partition_name),
|
|
task_table.getPartitionIsCleanedPath(partition_name)
|
|
);
|
|
Coordination::Stat stat{};
|
|
LogicalClock task_start_clock;
|
|
if (zookeeper->exists(task_table.getPartitionTaskStatusPath(partition_name), &stat))
|
|
task_start_clock = LogicalClock(stat.mzxid);
|
|
zookeeper->get(task_table.getPartitionTaskStatusPath(partition_name), &stat);
|
|
if (!clean_state_clock.is_clean() || task_start_clock <= clean_state_clock.discovery_zxid)
|
|
{
|
|
LOG_INFO(log, "Partition " << partition_name << " become dirty");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
get_futures.clear();
|
|
for (const String & path : status_paths)
|
|
get_futures.emplace_back(zookeeper->asyncGet(path));
|
|
|
|
// Remember zxid of states again
|
|
for (auto & future : get_futures)
|
|
{
|
|
auto res = future.get();
|
|
zxid2.push_back(res.stat.pzxid);
|
|
}
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
LOG_INFO(log, "A ZooKeeper error occurred while checking partition " << partition_name
|
|
<< ". Will recheck the partition. Error: " << e.displayText());
|
|
return false;
|
|
}
|
|
|
|
// If all task is finished and zxid is not changed then partition could not become dirty again
|
|
for (UInt64 shard_num = 0; shard_num < status_paths.size(); ++shard_num)
|
|
{
|
|
if (zxid1[shard_num] != zxid2[shard_num])
|
|
{
|
|
LOG_INFO(log, "The task " << status_paths[shard_num] << " is being modified now. Partition will be rechecked");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
LOG_INFO(log, "Partition " << partition_name << " is copied successfully");
|
|
return true;
|
|
}
|
|
|
|
/// Removes MATERIALIZED and ALIAS columns from create table query
|
|
static ASTPtr removeAliasColumnsFromCreateQuery(const ASTPtr & query_ast)
|
|
{
|
|
const ASTs & column_asts = query_ast->as<ASTCreateQuery &>().columns_list->columns->children;
|
|
auto new_columns = std::make_shared<ASTExpressionList>();
|
|
|
|
for (const ASTPtr & column_ast : column_asts)
|
|
{
|
|
const auto & column = column_ast->as<ASTColumnDeclaration &>();
|
|
|
|
if (!column.default_specifier.empty())
|
|
{
|
|
ColumnDefaultKind kind = columnDefaultKindFromString(column.default_specifier);
|
|
if (kind == ColumnDefaultKind::Materialized || kind == ColumnDefaultKind::Alias)
|
|
continue;
|
|
}
|
|
|
|
new_columns->children.emplace_back(column_ast->clone());
|
|
}
|
|
|
|
ASTPtr new_query_ast = query_ast->clone();
|
|
auto & new_query = new_query_ast->as<ASTCreateQuery &>();
|
|
|
|
auto new_columns_list = std::make_shared<ASTColumns>();
|
|
new_columns_list->set(new_columns_list->columns, new_columns);
|
|
if (auto indices = query_ast->as<ASTCreateQuery>()->columns_list->indices)
|
|
new_columns_list->set(new_columns_list->indices, indices->clone());
|
|
|
|
new_query.replace(new_query.columns_list, new_columns_list);
|
|
|
|
return new_query_ast;
|
|
}
|
|
|
|
/// Replaces ENGINE and table name in a create query
|
|
static std::shared_ptr<ASTCreateQuery> rewriteCreateQueryStorage(const ASTPtr & create_query_ast, const DatabaseAndTableName & new_table, const ASTPtr & new_storage_ast)
|
|
{
|
|
const auto & create = create_query_ast->as<ASTCreateQuery &>();
|
|
auto res = std::make_shared<ASTCreateQuery>(create);
|
|
|
|
if (create.storage == nullptr || new_storage_ast == nullptr)
|
|
throw Exception("Storage is not specified", ErrorCodes::LOGICAL_ERROR);
|
|
|
|
res->database = new_table.first;
|
|
res->table = new_table.second;
|
|
|
|
res->children.clear();
|
|
res->set(res->columns_list, create.columns_list->clone());
|
|
res->set(res->storage, new_storage_ast->clone());
|
|
|
|
return res;
|
|
}
|
|
|
|
/** Allows to compare two incremental counters of type UInt32 in presence of possible overflow.
|
|
* We assume that we compare values that are not too far away.
|
|
* For example, when we increment 0xFFFFFFFF, we get 0. So, 0xFFFFFFFF is less than 0.
|
|
*/
|
|
class WrappingUInt32
|
|
{
|
|
public:
|
|
UInt32 value;
|
|
|
|
explicit WrappingUInt32(UInt32 _value)
|
|
: value(_value)
|
|
{}
|
|
|
|
bool operator<(const WrappingUInt32 & other) const
|
|
{
|
|
return value != other.value && *this <= other;
|
|
}
|
|
|
|
bool operator<=(const WrappingUInt32 & other) const
|
|
{
|
|
const UInt32 HALF = 1 << 31;
|
|
return (value <= other.value && other.value - value < HALF)
|
|
|| (value > other.value && value - other.value > HALF);
|
|
}
|
|
|
|
bool operator==(const WrappingUInt32 & other) const
|
|
{
|
|
return value == other.value;
|
|
}
|
|
};
|
|
|
|
/** Conforming Zxid definition.
|
|
* cf. https://github.com/apache/zookeeper/blob/631d1b284f0edb1c4f6b0fb221bf2428aec71aaa/zookeeper-docs/src/main/resources/markdown/zookeeperInternals.md#guarantees-properties-and-definitions
|
|
*
|
|
* But it is better to read this: https://zookeeper.apache.org/doc/r3.1.2/zookeeperProgrammers.html
|
|
*
|
|
* Actually here is the definition of Zxid.
|
|
* Every change to the ZooKeeper state receives a stamp in the form of a zxid (ZooKeeper Transaction Id).
|
|
* This exposes the total ordering of all changes to ZooKeeper. Each change will have a unique zxid
|
|
* and if zxid1 is smaller than zxid2 then zxid1 happened before zxid2.
|
|
*/
|
|
class Zxid
|
|
{
|
|
public:
|
|
WrappingUInt32 epoch;
|
|
WrappingUInt32 counter;
|
|
explicit Zxid(UInt64 _zxid)
|
|
: epoch(_zxid >> 32)
|
|
, counter(_zxid)
|
|
{}
|
|
|
|
bool operator<=(const Zxid & other) const
|
|
{
|
|
return (epoch < other.epoch)
|
|
|| (epoch == other.epoch && counter <= other.counter);
|
|
}
|
|
|
|
bool operator==(const Zxid & other) const
|
|
{
|
|
return epoch == other.epoch && counter == other.counter;
|
|
}
|
|
};
|
|
|
|
/* When multiple ClusterCopiers discover that the target partition is not empty,
|
|
* they will attempt to clean up this partition before proceeding to copying.
|
|
*
|
|
* Instead of purging is_dirty, the history of cleaning work is preserved and partition hygiene is established
|
|
* based on a happens-before relation between the events.
|
|
* This relation is encoded by LogicalClock based on the mzxid of the is_dirty ZNode and is_dirty/cleaned.
|
|
* The fact of the partition hygiene is encoded by CleanStateClock.
|
|
*
|
|
* For you to know what mzxid means:
|
|
*
|
|
* ZooKeeper Stat Structure:
|
|
* The Stat structure for each znode in ZooKeeper is made up of the following fields:
|
|
*
|
|
* -- czxid
|
|
* The zxid of the change that caused this znode to be created.
|
|
*
|
|
* -- mzxid
|
|
* The zxid of the change that last modified this znode.
|
|
*
|
|
* -- ctime
|
|
* The time in milliseconds from epoch when this znode was created.
|
|
*
|
|
* -- mtime
|
|
* The time in milliseconds from epoch when this znode was last modified.
|
|
*
|
|
* -- version
|
|
* The number of changes to the data of this znode.
|
|
*
|
|
* -- cversion
|
|
* The number of changes to the children of this znode.
|
|
*
|
|
* -- aversion
|
|
* The number of changes to the ACL of this znode.
|
|
*
|
|
* -- ephemeralOwner
|
|
* The session id of the owner of this znode if the znode is an ephemeral node.
|
|
* If it is not an ephemeral node, it will be zero.
|
|
*
|
|
* -- dataLength
|
|
* The length of the data field of this znode.
|
|
*
|
|
* -- numChildren
|
|
* The number of children of this znode.
|
|
* */
|
|
|
|
class LogicalClock
|
|
{
|
|
public:
|
|
std::optional<Zxid> zxid;
|
|
|
|
LogicalClock() = default;
|
|
|
|
explicit LogicalClock(UInt64 _zxid)
|
|
: zxid(_zxid)
|
|
{}
|
|
|
|
bool hasHappened() const
|
|
{
|
|
return bool(zxid);
|
|
}
|
|
|
|
/// happens-before relation with a reasonable time bound
|
|
bool happensBefore(const LogicalClock & other) const
|
|
{
|
|
return !zxid
|
|
|| (other.zxid && *zxid <= *other.zxid);
|
|
}
|
|
|
|
bool operator<=(const LogicalClock & other) const
|
|
{
|
|
return happensBefore(other);
|
|
}
|
|
|
|
/// strict equality check
|
|
bool operator==(const LogicalClock & other) const
|
|
{
|
|
return zxid == other.zxid;
|
|
}
|
|
};
|
|
|
|
|
|
class CleanStateClock
|
|
{
|
|
public:
|
|
LogicalClock discovery_zxid;
|
|
std::optional<UInt32> discovery_version;
|
|
|
|
LogicalClock clean_state_zxid;
|
|
std::optional<UInt32> clean_state_version;
|
|
|
|
std::shared_ptr<std::atomic_bool> stale;
|
|
|
|
bool is_clean() const
|
|
{
|
|
return
|
|
!is_stale()
|
|
&& (
|
|
!discovery_zxid.hasHappened()
|
|
|| (clean_state_zxid.hasHappened() && discovery_zxid <= clean_state_zxid));
|
|
}
|
|
|
|
bool is_stale() const
|
|
{
|
|
return stale->load();
|
|
}
|
|
|
|
CleanStateClock(
|
|
const zkutil::ZooKeeperPtr & zookeeper,
|
|
const String & discovery_path,
|
|
const String & clean_state_path)
|
|
: stale(std::make_shared<std::atomic_bool>(false))
|
|
{
|
|
Coordination::Stat stat{};
|
|
String _some_data;
|
|
auto watch_callback =
|
|
[stale = stale] (const Coordination::WatchResponse & rsp)
|
|
{
|
|
auto logger = &Poco::Logger::get("ClusterCopier");
|
|
if (rsp.error == Coordination::ZOK)
|
|
{
|
|
switch (rsp.type)
|
|
{
|
|
case Coordination::CREATED:
|
|
LOG_DEBUG(logger, "CleanStateClock change: CREATED, at " << rsp.path);
|
|
stale->store(true);
|
|
break;
|
|
case Coordination::CHANGED:
|
|
LOG_DEBUG(logger, "CleanStateClock change: CHANGED, at" << rsp.path);
|
|
stale->store(true);
|
|
}
|
|
}
|
|
};
|
|
if (zookeeper->tryGetWatch(discovery_path, _some_data, &stat, watch_callback))
|
|
{
|
|
discovery_zxid = LogicalClock(stat.mzxid);
|
|
discovery_version = stat.version;
|
|
}
|
|
if (zookeeper->tryGetWatch(clean_state_path, _some_data, &stat, watch_callback))
|
|
{
|
|
clean_state_zxid = LogicalClock(stat.mzxid);
|
|
clean_state_version = stat.version;
|
|
}
|
|
}
|
|
|
|
bool operator==(const CleanStateClock & other) const
|
|
{
|
|
return !is_stale()
|
|
&& !other.is_stale()
|
|
&& discovery_zxid == other.discovery_zxid
|
|
&& discovery_version == other.discovery_version
|
|
&& clean_state_zxid == other.clean_state_zxid
|
|
&& clean_state_version == other.clean_state_version;
|
|
}
|
|
|
|
bool operator!=(const CleanStateClock & other) const
|
|
{
|
|
return !(*this == other);
|
|
}
|
|
};
|
|
|
|
bool tryDropPartition(ShardPartition & task_partition, const zkutil::ZooKeeperPtr & zookeeper, const CleanStateClock & clean_state_clock)
|
|
{
|
|
if (is_safe_mode)
|
|
throw Exception("DROP PARTITION is prohibited in safe mode", ErrorCodes::NOT_IMPLEMENTED);
|
|
|
|
TaskTable & task_table = task_partition.task_shard.task_table;
|
|
|
|
const String current_shards_path = task_partition.getPartitionShardsPath();
|
|
const String current_partition_active_workers_dir = task_partition.getPartitionActiveWorkersPath();
|
|
const String is_dirty_flag_path = task_partition.getCommonPartitionIsDirtyPath();
|
|
const String dirty_cleaner_path = is_dirty_flag_path + "/cleaner";
|
|
const String is_dirty_cleaned_path = task_partition.getCommonPartitionIsCleanedPath();
|
|
|
|
zkutil::EphemeralNodeHolder::Ptr cleaner_holder;
|
|
try
|
|
{
|
|
cleaner_holder = zkutil::EphemeralNodeHolder::create(dirty_cleaner_path, *zookeeper, host_id);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (e.code == Coordination::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "Partition " << task_partition.name << " is cleaning now by somebody, sleep");
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
return false;
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
Coordination::Stat stat{};
|
|
if (zookeeper->exists(current_partition_active_workers_dir, &stat))
|
|
{
|
|
if (stat.numChildren != 0)
|
|
{
|
|
LOG_DEBUG(log, "Partition " << task_partition.name << " contains " << stat.numChildren << " active workers while trying to drop it. Going to sleep.");
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
zookeeper->remove(current_partition_active_workers_dir);
|
|
}
|
|
}
|
|
|
|
{
|
|
zkutil::EphemeralNodeHolder::Ptr active_workers_lock;
|
|
try
|
|
{
|
|
active_workers_lock = zkutil::EphemeralNodeHolder::create(current_partition_active_workers_dir, *zookeeper, host_id);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (e.code == Coordination::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "Partition " << task_partition.name << " is being filled now by somebody, sleep");
|
|
return false;
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
// Lock the dirty flag
|
|
zookeeper->set(is_dirty_flag_path, host_id, clean_state_clock.discovery_version.value());
|
|
zookeeper->tryRemove(task_partition.getPartitionCleanStartPath());
|
|
CleanStateClock my_clock(zookeeper, is_dirty_flag_path, is_dirty_cleaned_path);
|
|
|
|
/// Remove all status nodes
|
|
{
|
|
Strings children;
|
|
if (zookeeper->tryGetChildren(current_shards_path, children) == Coordination::ZOK)
|
|
for (const auto & child : children)
|
|
{
|
|
zookeeper->removeRecursive(current_shards_path + "/" + child);
|
|
}
|
|
}
|
|
|
|
String query = "ALTER TABLE " + getQuotedTable(task_table.table_push);
|
|
query += " DROP PARTITION " + task_partition.name + "";
|
|
|
|
/// TODO: use this statement after servers will be updated up to 1.1.54310
|
|
// query += " DROP PARTITION ID '" + task_partition.name + "'";
|
|
|
|
ClusterPtr & cluster_push = task_table.cluster_push;
|
|
Settings settings_push = task_cluster->settings_push;
|
|
|
|
/// It is important, DROP PARTITION must be done synchronously
|
|
settings_push.replication_alter_partitions_sync = 2;
|
|
|
|
LOG_DEBUG(log, "Execute distributed DROP PARTITION: " << query);
|
|
/// Limit number of max executing replicas to 1
|
|
UInt64 num_shards = executeQueryOnCluster(cluster_push, query, nullptr, &settings_push, PoolMode::GET_ONE, 1);
|
|
|
|
if (num_shards < cluster_push->getShardCount())
|
|
{
|
|
LOG_INFO(log, "DROP PARTITION wasn't successfully executed on " << cluster_push->getShardCount() - num_shards << " shards");
|
|
return false;
|
|
}
|
|
|
|
/// Update the locking node
|
|
if (!my_clock.is_stale())
|
|
{
|
|
zookeeper->set(is_dirty_flag_path, host_id, my_clock.discovery_version.value());
|
|
if (my_clock.clean_state_version)
|
|
zookeeper->set(is_dirty_cleaned_path, host_id, my_clock.clean_state_version.value());
|
|
else
|
|
zookeeper->create(is_dirty_cleaned_path, host_id, zkutil::CreateMode::Persistent);
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Clean state is altered when dropping the partition, cowardly bailing");
|
|
/// clean state is stale
|
|
return false;
|
|
}
|
|
|
|
LOG_INFO(log, "Partition " << task_partition.name << " was dropped on cluster " << task_table.cluster_push_name);
|
|
if (zookeeper->tryCreate(current_shards_path, host_id, zkutil::CreateMode::Persistent) == Coordination::ZNODEEXISTS)
|
|
zookeeper->set(current_shards_path, host_id);
|
|
}
|
|
|
|
LOG_INFO(log, "Partition " << task_partition.name << " is safe for work now.");
|
|
return true;
|
|
}
|
|
|
|
|
|
static constexpr UInt64 max_table_tries = 1000;
|
|
static constexpr UInt64 max_shard_partition_tries = 600;
|
|
|
|
bool tryProcessTable(const ConnectionTimeouts & timeouts, TaskTable & task_table)
|
|
{
|
|
/// A heuristic: if previous shard is already done, then check next one without sleeps due to max_workers constraint
|
|
bool previous_shard_is_instantly_finished = false;
|
|
|
|
/// Process each partition that is present in cluster
|
|
for (const String & partition_name : task_table.ordered_partition_names)
|
|
{
|
|
if (!task_table.cluster_partitions.count(partition_name))
|
|
throw Exception("There are no expected partition " + partition_name + ". It is a bug", ErrorCodes::LOGICAL_ERROR);
|
|
|
|
ClusterPartition & cluster_partition = task_table.cluster_partitions[partition_name];
|
|
|
|
Stopwatch watch;
|
|
/// We will check all the shards of the table and check if they contain current partition.
|
|
TasksShard expected_shards;
|
|
UInt64 num_failed_shards = 0;
|
|
|
|
++cluster_partition.total_tries;
|
|
|
|
LOG_DEBUG(log, "Processing partition " << partition_name << " for the whole cluster");
|
|
|
|
/// Process each source shard having current partition and copy current partition
|
|
/// NOTE: shards are sorted by "distance" to current host
|
|
bool has_shard_to_process = false;
|
|
for (const TaskShardPtr & shard : task_table.all_shards)
|
|
{
|
|
/// Does shard have a node with current partition?
|
|
if (shard->partition_tasks.count(partition_name) == 0)
|
|
{
|
|
/// If not, did we check existence of that partition previously?
|
|
if (shard->checked_partitions.count(partition_name) == 0)
|
|
{
|
|
auto check_shard_has_partition = [&] () { return checkShardHasPartition(timeouts, *shard, partition_name); };
|
|
bool has_partition = retry(check_shard_has_partition);
|
|
|
|
shard->checked_partitions.emplace(partition_name);
|
|
|
|
if (has_partition)
|
|
{
|
|
shard->partition_tasks.emplace(partition_name, ShardPartition(*shard, partition_name));
|
|
LOG_DEBUG(log, "Discovered partition " << partition_name << " in shard " << shard->getDescription());
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Found that shard " << shard->getDescription() << " does not contain current partition " << partition_name);
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/// We have already checked that partition, but did not discover it
|
|
previous_shard_is_instantly_finished = true;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
auto it_shard_partition = shard->partition_tasks.find(partition_name);
|
|
/// Previously when we discovered that shard does not contain current partition, we skipped it.
|
|
/// At this moment partition have to be present.
|
|
if (it_shard_partition == shard->partition_tasks.end())
|
|
throw Exception("There are no such partition in a shard. This is a bug.", ErrorCodes::LOGICAL_ERROR);
|
|
auto & partition = it_shard_partition->second;
|
|
|
|
expected_shards.emplace_back(shard);
|
|
|
|
/// Do not sleep if there is a sequence of already processed shards to increase startup
|
|
bool is_unprioritized_task = !previous_shard_is_instantly_finished && shard->priority.is_remote;
|
|
PartitionTaskStatus task_status = PartitionTaskStatus::Error;
|
|
bool was_error = false;
|
|
has_shard_to_process = true;
|
|
for (UInt64 try_num = 0; try_num < max_shard_partition_tries; ++try_num)
|
|
{
|
|
task_status = tryProcessPartitionTask(timeouts, partition, is_unprioritized_task);
|
|
|
|
/// Exit if success
|
|
if (task_status == PartitionTaskStatus::Finished)
|
|
break;
|
|
|
|
was_error = true;
|
|
|
|
/// Skip if the task is being processed by someone
|
|
if (task_status == PartitionTaskStatus::Active)
|
|
break;
|
|
|
|
/// Repeat on errors
|
|
std::this_thread::sleep_for(default_sleep_time);
|
|
}
|
|
|
|
if (task_status == PartitionTaskStatus::Error)
|
|
++num_failed_shards;
|
|
|
|
previous_shard_is_instantly_finished = !was_error;
|
|
}
|
|
|
|
cluster_partition.elapsed_time_seconds += watch.elapsedSeconds();
|
|
|
|
/// Check that whole cluster partition is done
|
|
/// Firstly check the number of failed partition tasks, then look into ZooKeeper and ensure that each partition is done
|
|
bool partition_is_done = num_failed_shards == 0;
|
|
try
|
|
{
|
|
partition_is_done =
|
|
!has_shard_to_process
|
|
|| (partition_is_done && checkPartitionIsDone(task_table, partition_name, expected_shards));
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log);
|
|
partition_is_done = false;
|
|
}
|
|
|
|
if (partition_is_done)
|
|
{
|
|
task_table.finished_cluster_partitions.emplace(partition_name);
|
|
|
|
task_table.bytes_copied += cluster_partition.bytes_copied;
|
|
task_table.rows_copied += cluster_partition.rows_copied;
|
|
double elapsed = cluster_partition.elapsed_time_seconds;
|
|
|
|
LOG_INFO(log, "It took " << std::fixed << std::setprecision(2) << elapsed << " seconds to copy partition " << partition_name
|
|
<< ": " << formatReadableSizeWithDecimalSuffix(cluster_partition.bytes_copied) << " uncompressed bytes"
|
|
<< ", " << formatReadableQuantity(cluster_partition.rows_copied) << " rows"
|
|
<< " and " << cluster_partition.blocks_copied << " source blocks are copied");
|
|
|
|
if (cluster_partition.rows_copied)
|
|
{
|
|
LOG_INFO(log, "Average partition speed: "
|
|
<< formatReadableSizeWithDecimalSuffix(cluster_partition.bytes_copied / elapsed) << " per second.");
|
|
}
|
|
|
|
if (task_table.rows_copied)
|
|
{
|
|
LOG_INFO(log, "Average table " << task_table.table_id << " speed: "
|
|
<< formatReadableSizeWithDecimalSuffix(task_table.bytes_copied / elapsed) << " per second.");
|
|
}
|
|
}
|
|
}
|
|
|
|
UInt64 required_partitions = task_table.cluster_partitions.size();
|
|
UInt64 finished_partitions = task_table.finished_cluster_partitions.size();
|
|
bool table_is_done = finished_partitions >= required_partitions;
|
|
|
|
if (!table_is_done)
|
|
{
|
|
LOG_INFO(log, "Table " + task_table.table_id + " is not processed yet."
|
|
<< "Copied " << finished_partitions << " of " << required_partitions << ", will retry");
|
|
}
|
|
|
|
return table_is_done;
|
|
}
|
|
|
|
|
|
/// Execution status of a task
|
|
enum class PartitionTaskStatus
|
|
{
|
|
Active,
|
|
Finished,
|
|
Error,
|
|
};
|
|
|
|
/// Job for copying partition from particular shard.
|
|
PartitionTaskStatus tryProcessPartitionTask(const ConnectionTimeouts & timeouts, ShardPartition & task_partition, bool is_unprioritized_task)
|
|
{
|
|
PartitionTaskStatus res;
|
|
|
|
try
|
|
{
|
|
res = processPartitionTaskImpl(timeouts, task_partition, is_unprioritized_task);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred while processing partition " + task_partition.name);
|
|
res = PartitionTaskStatus::Error;
|
|
}
|
|
|
|
/// At the end of each task check if the config is updated
|
|
try
|
|
{
|
|
updateConfigIfNeeded();
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred while updating the config");
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
PartitionTaskStatus processPartitionTaskImpl(const ConnectionTimeouts & timeouts, ShardPartition & task_partition, bool is_unprioritized_task)
|
|
{
|
|
TaskShard & task_shard = task_partition.task_shard;
|
|
TaskTable & task_table = task_shard.task_table;
|
|
ClusterPartition & cluster_partition = task_table.getClusterPartition(task_partition.name);
|
|
const size_t number_of_splits = task_table.number_of_splits;
|
|
UNUSED(number_of_splits);
|
|
|
|
/// We need to update table definitions for each partition, it could be changed after ALTER
|
|
createShardInternalTables(timeouts, task_shard);
|
|
|
|
auto zookeeper = context.getZooKeeper();
|
|
|
|
const String is_dirty_flag_path = task_partition.getCommonPartitionIsDirtyPath();
|
|
const String is_dirty_cleaned_path = task_partition.getCommonPartitionIsCleanedPath();
|
|
const String current_task_is_active_path = task_partition.getActiveWorkerPath();
|
|
const String current_task_status_path = task_partition.getShardStatusPath();
|
|
|
|
/// Auxiliary functions:
|
|
|
|
/// Creates is_dirty node to initialize DROP PARTITION
|
|
auto create_is_dirty_node = [&, this] (const CleanStateClock & clock)
|
|
{
|
|
if (clock.is_stale())
|
|
LOG_DEBUG(log, "Clean state clock is stale while setting dirty flag, cowardly bailing");
|
|
else if (!clock.is_clean())
|
|
LOG_DEBUG(log, "Thank you, Captain Obvious");
|
|
else if (clock.discovery_version)
|
|
{
|
|
LOG_DEBUG(log, "Updating clean state clock");
|
|
zookeeper->set(is_dirty_flag_path, host_id, clock.discovery_version.value());
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Creating clean state clock");
|
|
zookeeper->create(is_dirty_flag_path, host_id, zkutil::CreateMode::Persistent);
|
|
}
|
|
};
|
|
|
|
/// Returns SELECT query filtering current partition and applying user filter
|
|
auto get_select_query = [&] (const DatabaseAndTableName & from_table, const String & fields, String limit = "",
|
|
bool enable_splitting = false, size_t current_piece_number = 0)
|
|
{
|
|
String query;
|
|
query += "SELECT " + fields + " FROM " + getQuotedTable(from_table);
|
|
/// TODO: Bad, it is better to rewrite with ASTLiteral(partition_key_field)
|
|
query += " WHERE (" + queryToString(task_table.engine_push_partition_key_ast) + " = (" + task_partition.name + " AS partition_key))";
|
|
if (enable_splitting)
|
|
query += " AND ( cityHash64(*) = " + std::to_string(current_piece_number) + " )";
|
|
if (!task_table.where_condition_str.empty())
|
|
query += " AND (" + task_table.where_condition_str + ")";
|
|
if (!limit.empty())
|
|
query += " LIMIT " + limit;
|
|
|
|
ParserQuery p_query(query.data() + query.size());
|
|
return parseQuery(p_query, query, 0);
|
|
};
|
|
|
|
/// Load balancing
|
|
auto worker_node_holder = createTaskWorkerNodeAndWaitIfNeed(zookeeper, current_task_status_path, is_unprioritized_task);
|
|
|
|
LOG_DEBUG(log, "Processing " << current_task_status_path);
|
|
|
|
CleanStateClock clean_state_clock (zookeeper, is_dirty_flag_path, is_dirty_cleaned_path);
|
|
|
|
LogicalClock task_start_clock;
|
|
{
|
|
Coordination::Stat stat{};
|
|
if (zookeeper->exists(task_partition.getPartitionShardsPath(), &stat))
|
|
task_start_clock = LogicalClock(stat.mzxid);
|
|
}
|
|
|
|
/// Do not start if partition is dirty, try to clean it
|
|
if (clean_state_clock.is_clean()
|
|
&& (!task_start_clock.hasHappened() || clean_state_clock.discovery_zxid <= task_start_clock))
|
|
{
|
|
LOG_DEBUG(log, "Partition " << task_partition.name << " appears to be clean");
|
|
zookeeper->createAncestors(current_task_status_path);
|
|
}
|
|
else
|
|
{
|
|
LOG_DEBUG(log, "Partition " << task_partition.name << " is dirty, try to drop it");
|
|
|
|
try
|
|
{
|
|
tryDropPartition(task_partition, zookeeper, clean_state_clock);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred when clean partition");
|
|
}
|
|
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
|
|
/// Create ephemeral node to mark that we are active and process the partition
|
|
zookeeper->createAncestors(current_task_is_active_path);
|
|
zkutil::EphemeralNodeHolderPtr partition_task_node_holder;
|
|
try
|
|
{
|
|
partition_task_node_holder = zkutil::EphemeralNodeHolder::create(current_task_is_active_path, *zookeeper, host_id);
|
|
}
|
|
catch (const Coordination::Exception & e)
|
|
{
|
|
if (e.code == Coordination::ZNODEEXISTS)
|
|
{
|
|
LOG_DEBUG(log, "Someone is already processing " << current_task_is_active_path);
|
|
return PartitionTaskStatus::Active;
|
|
}
|
|
|
|
throw;
|
|
}
|
|
|
|
/// Exit if task has been already processed;
|
|
/// create blocking node to signal cleaning up if it is abandoned
|
|
{
|
|
String status_data;
|
|
if (zookeeper->tryGet(current_task_status_path, status_data))
|
|
{
|
|
TaskStateWithOwner status = TaskStateWithOwner::fromString(status_data);
|
|
if (status.state == TaskState::Finished)
|
|
{
|
|
LOG_DEBUG(log, "Task " << current_task_status_path << " has been successfully executed by " << status.owner);
|
|
return PartitionTaskStatus::Finished;
|
|
}
|
|
|
|
// Task is abandoned, initialize DROP PARTITION
|
|
LOG_DEBUG(log, "Task " << current_task_status_path << " has not been successfully finished by " <<
|
|
status.owner << ". Partition will be dropped and refilled.");
|
|
|
|
create_is_dirty_node(clean_state_clock);
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
}
|
|
|
|
/// Check that destination partition is empty if we are first worker
|
|
/// NOTE: this check is incorrect if pull and push tables have different partition key!
|
|
String clean_start_status;
|
|
if (!zookeeper->tryGet(task_partition.getPartitionCleanStartPath(), clean_start_status) || clean_start_status != "ok")
|
|
{
|
|
zookeeper->createIfNotExists(task_partition.getPartitionCleanStartPath(), "");
|
|
auto checker = zkutil::EphemeralNodeHolder::create(task_partition.getPartitionCleanStartPath() + "/checker",
|
|
*zookeeper, host_id);
|
|
// Maybe we are the first worker
|
|
ASTPtr query_select_ast = get_select_query(task_shard.table_split_shard, "count()");
|
|
UInt64 count;
|
|
{
|
|
Context local_context = context;
|
|
// Use pull (i.e. readonly) settings, but fetch data from destination servers
|
|
local_context.getSettingsRef() = task_cluster->settings_pull;
|
|
local_context.getSettingsRef().skip_unavailable_shards = true;
|
|
|
|
Block block = getBlockWithAllStreamData(InterpreterFactory::get(query_select_ast, local_context)->execute().in);
|
|
count = (block) ? block.safeGetByPosition(0).column->getUInt(0) : 0;
|
|
}
|
|
|
|
if (count != 0)
|
|
{
|
|
Coordination::Stat stat_shards{};
|
|
zookeeper->get(task_partition.getPartitionShardsPath(), &stat_shards);
|
|
|
|
/// NOTE: partition is still fresh if dirt discovery happens before cleaning
|
|
if (stat_shards.numChildren == 0)
|
|
{
|
|
LOG_WARNING(log, "There are no workers for partition " << task_partition.name
|
|
<< ", but destination table contains " << count << " rows"
|
|
<< ". Partition will be dropped and refilled.");
|
|
|
|
create_is_dirty_node(clean_state_clock);
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
}
|
|
zookeeper->set(task_partition.getPartitionCleanStartPath(), "ok");
|
|
}
|
|
/// At this point, we need to sync that the destination table is clean
|
|
/// before any actual work
|
|
|
|
/// Try start processing, create node about it
|
|
{
|
|
String start_state = TaskStateWithOwner::getData(TaskState::Started, host_id);
|
|
CleanStateClock new_clean_state_clock (zookeeper, is_dirty_flag_path, is_dirty_cleaned_path);
|
|
if (clean_state_clock != new_clean_state_clock)
|
|
{
|
|
LOG_INFO(log, "Partition " << task_partition.name << " clean state changed, cowardly bailing");
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
else if (!new_clean_state_clock.is_clean())
|
|
{
|
|
LOG_INFO(log, "Partition " << task_partition.name << " is dirty and will be dropped and refilled");
|
|
create_is_dirty_node(new_clean_state_clock);
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
zookeeper->create(current_task_status_path, start_state, zkutil::CreateMode::Persistent);
|
|
}
|
|
|
|
/// Try create table (if not exists) on each shard
|
|
{
|
|
auto create_query_push_ast = rewriteCreateQueryStorage(task_shard.current_pull_table_create_query,
|
|
task_table.table_push, task_table.engine_push_ast);
|
|
create_query_push_ast->as<ASTCreateQuery &>().if_not_exists = true;
|
|
String query = queryToString(create_query_push_ast);
|
|
|
|
LOG_DEBUG(log, "Create destination tables. Query: " << query);
|
|
UInt64 shards = executeQueryOnCluster(task_table.cluster_push, query,
|
|
create_query_push_ast, &task_cluster->settings_push,
|
|
PoolMode::GET_MANY);
|
|
LOG_DEBUG(log, "Destination tables " << getQuotedTable(task_table.table_push) <<
|
|
" have been created on " << shards << " shards of " << task_table.cluster_push->getShardCount());
|
|
}
|
|
|
|
/// Do the copying
|
|
{
|
|
bool inject_fault = false;
|
|
if (copy_fault_probability > 0)
|
|
{
|
|
double value = std::uniform_real_distribution<>(0, 1)(task_table.task_cluster.random_engine);
|
|
inject_fault = value < copy_fault_probability;
|
|
}
|
|
|
|
// Select all fields
|
|
ASTPtr query_select_ast = get_select_query(task_shard.table_read_shard, "*", inject_fault ? "1" : "");
|
|
|
|
LOG_DEBUG(log, "Executing SELECT query and pull from " << task_shard.getDescription()
|
|
<< " : " << queryToString(query_select_ast));
|
|
|
|
ASTPtr query_insert_ast;
|
|
{
|
|
String query;
|
|
query += "INSERT INTO " + getQuotedTable(task_shard.table_split_shard) + " VALUES ";
|
|
|
|
ParserQuery p_query(query.data() + query.size());
|
|
query_insert_ast = parseQuery(p_query, query, 0);
|
|
|
|
LOG_DEBUG(log, "Executing INSERT query: " << query);
|
|
}
|
|
|
|
try
|
|
{
|
|
/// Custom INSERT SELECT implementation
|
|
Context context_select = context;
|
|
context_select.getSettingsRef() = task_cluster->settings_pull;
|
|
|
|
Context context_insert = context;
|
|
context_insert.getSettingsRef() = task_cluster->settings_push;
|
|
|
|
BlockInputStreamPtr input;
|
|
BlockOutputStreamPtr output;
|
|
{
|
|
BlockIO io_select = InterpreterFactory::get(query_select_ast, context_select)->execute();
|
|
BlockIO io_insert = InterpreterFactory::get(query_insert_ast, context_insert)->execute();
|
|
|
|
input = io_select.in;
|
|
output = io_insert.out;
|
|
}
|
|
|
|
/// Fail-fast optimization to abort copying when the current clean state expires
|
|
std::future<Coordination::ExistsResponse> future_is_dirty_checker;
|
|
|
|
Stopwatch watch(CLOCK_MONOTONIC_COARSE);
|
|
constexpr UInt64 check_period_milliseconds = 500;
|
|
|
|
/// Will asynchronously check that ZooKeeper connection and is_dirty flag appearing while copying data
|
|
auto cancel_check = [&] ()
|
|
{
|
|
if (zookeeper->expired())
|
|
throw Exception("ZooKeeper session is expired, cancel INSERT SELECT", ErrorCodes::UNFINISHED);
|
|
|
|
if (!future_is_dirty_checker.valid())
|
|
future_is_dirty_checker = zookeeper->asyncExists(is_dirty_flag_path);
|
|
|
|
/// check_period_milliseconds should less than average insert time of single block
|
|
/// Otherwise, the insertion will slow a little bit
|
|
if (watch.elapsedMilliseconds() >= check_period_milliseconds)
|
|
{
|
|
Coordination::ExistsResponse status = future_is_dirty_checker.get();
|
|
|
|
if (status.error != Coordination::ZNONODE)
|
|
{
|
|
LogicalClock dirt_discovery_epoch (status.stat.mzxid);
|
|
if (dirt_discovery_epoch == clean_state_clock.discovery_zxid)
|
|
return false;
|
|
throw Exception("Partition is dirty, cancel INSERT SELECT", ErrorCodes::UNFINISHED);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
};
|
|
|
|
/// Update statistics
|
|
/// It is quite rough: bytes_copied don't take into account DROP PARTITION.
|
|
auto update_stats = [&cluster_partition] (const Block & block)
|
|
{
|
|
cluster_partition.bytes_copied += block.bytes();
|
|
cluster_partition.rows_copied += block.rows();
|
|
cluster_partition.blocks_copied += 1;
|
|
};
|
|
|
|
/// Main work is here
|
|
copyData(*input, *output, cancel_check, update_stats);
|
|
|
|
// Just in case
|
|
if (future_is_dirty_checker.valid())
|
|
future_is_dirty_checker.get();
|
|
|
|
if (inject_fault)
|
|
throw Exception("Copy fault injection is activated", ErrorCodes::UNFINISHED);
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(log, "An error occurred during copying, partition will be marked as dirty");
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
}
|
|
|
|
/// Finalize the processing, change state of current partition task (and also check is_dirty flag)
|
|
{
|
|
String state_finished = TaskStateWithOwner::getData(TaskState::Finished, host_id);
|
|
CleanStateClock new_clean_state_clock (zookeeper, is_dirty_flag_path, is_dirty_cleaned_path);
|
|
if (clean_state_clock != new_clean_state_clock)
|
|
{
|
|
LOG_INFO(log, "Partition " << task_partition.name << " clean state changed, cowardly bailing");
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
else if (!new_clean_state_clock.is_clean())
|
|
{
|
|
LOG_INFO(log, "Partition " << task_partition.name << " became dirty and will be dropped and refilled");
|
|
create_is_dirty_node(new_clean_state_clock);
|
|
return PartitionTaskStatus::Error;
|
|
}
|
|
zookeeper->set(current_task_status_path, state_finished, 0);
|
|
}
|
|
|
|
LOG_INFO(log, "Partition " << task_partition.name << " copied");
|
|
return PartitionTaskStatus::Finished;
|
|
}
|
|
|
|
void dropAndCreateLocalTable(const ASTPtr & create_ast)
|
|
{
|
|
const auto & create = create_ast->as<ASTCreateQuery &>();
|
|
dropLocalTableIfExists({create.database, create.table});
|
|
|
|
InterpreterCreateQuery interpreter(create_ast, context);
|
|
interpreter.execute();
|
|
}
|
|
|
|
void dropLocalTableIfExists(const DatabaseAndTableName & table_name) const
|
|
{
|
|
auto drop_ast = std::make_shared<ASTDropQuery>();
|
|
drop_ast->if_exists = true;
|
|
drop_ast->database = table_name.first;
|
|
drop_ast->table = table_name.second;
|
|
|
|
InterpreterDropQuery interpreter(drop_ast, context);
|
|
interpreter.execute();
|
|
}
|
|
|
|
String getRemoteCreateTable(const DatabaseAndTableName & table, Connection & connection, const Settings * settings = nullptr)
|
|
{
|
|
String query = "SHOW CREATE TABLE " + getQuotedTable(table);
|
|
Block block = getBlockWithAllStreamData(std::make_shared<RemoteBlockInputStream>(
|
|
connection, query, InterpreterShowCreateQuery::getSampleBlock(), context, settings));
|
|
|
|
return typeid_cast<const ColumnString &>(*block.safeGetByPosition(0).column).getDataAt(0).toString();
|
|
}
|
|
|
|
ASTPtr getCreateTableForPullShard(const ConnectionTimeouts & timeouts, TaskShard & task_shard)
|
|
{
|
|
/// Fetch and parse (possibly) new definition
|
|
auto connection_entry = task_shard.info.pool->get(timeouts, &task_cluster->settings_pull);
|
|
String create_query_pull_str = getRemoteCreateTable(
|
|
task_shard.task_table.table_pull,
|
|
*connection_entry,
|
|
&task_cluster->settings_pull);
|
|
|
|
ParserCreateQuery parser_create_query;
|
|
return parseQuery(parser_create_query, create_query_pull_str, 0);
|
|
}
|
|
|
|
void createShardInternalTables(const ConnectionTimeouts & timeouts, TaskShard & task_shard, bool create_split = true)
|
|
{
|
|
TaskTable & task_table = task_shard.task_table;
|
|
|
|
/// We need to update table definitions for each part, it could be changed after ALTER
|
|
task_shard.current_pull_table_create_query = getCreateTableForPullShard(timeouts, task_shard);
|
|
|
|
/// Create local Distributed tables:
|
|
/// a table fetching data from current shard and a table inserting data to the whole destination cluster
|
|
String read_shard_prefix = ".read_shard_" + toString(task_shard.indexInCluster()) + ".";
|
|
String split_shard_prefix = ".split.";
|
|
task_shard.table_read_shard = DatabaseAndTableName(working_database_name, read_shard_prefix + task_table.table_id);
|
|
task_shard.table_split_shard = DatabaseAndTableName(working_database_name, split_shard_prefix + task_table.table_id);
|
|
|
|
/// Create special cluster with single shard
|
|
String shard_read_cluster_name = read_shard_prefix + task_table.cluster_pull_name;
|
|
ClusterPtr cluster_pull_current_shard = task_table.cluster_pull->getClusterWithSingleShard(task_shard.indexInCluster());
|
|
context.setCluster(shard_read_cluster_name, cluster_pull_current_shard);
|
|
|
|
auto storage_shard_ast = createASTStorageDistributed(shard_read_cluster_name, task_table.table_pull.first, task_table.table_pull.second);
|
|
const auto & storage_split_ast = task_table.engine_split_ast;
|
|
|
|
auto create_query_ast = removeAliasColumnsFromCreateQuery(task_shard.current_pull_table_create_query);
|
|
auto create_table_pull_ast = rewriteCreateQueryStorage(create_query_ast, task_shard.table_read_shard, storage_shard_ast);
|
|
auto create_table_split_ast = rewriteCreateQueryStorage(create_query_ast, task_shard.table_split_shard, storage_split_ast);
|
|
|
|
dropAndCreateLocalTable(create_table_pull_ast);
|
|
|
|
if (create_split)
|
|
dropAndCreateLocalTable(create_table_split_ast);
|
|
}
|
|
|
|
|
|
std::set<String> getShardPartitions(const ConnectionTimeouts & timeouts, TaskShard & task_shard)
|
|
{
|
|
createShardInternalTables(timeouts, task_shard, false);
|
|
|
|
TaskTable & task_table = task_shard.task_table;
|
|
|
|
String query;
|
|
{
|
|
WriteBufferFromOwnString wb;
|
|
wb << "SELECT DISTINCT " << queryToString(task_table.engine_push_partition_key_ast) << " AS partition FROM"
|
|
<< " " << getQuotedTable(task_shard.table_read_shard) << " ORDER BY partition DESC";
|
|
query = wb.str();
|
|
}
|
|
|
|
ParserQuery parser_query(query.data() + query.size());
|
|
ASTPtr query_ast = parseQuery(parser_query, query, 0);
|
|
|
|
LOG_DEBUG(log, "Computing destination partition set, executing query: " << query);
|
|
|
|
Context local_context = context;
|
|
local_context.setSettings(task_cluster->settings_pull);
|
|
Block block = getBlockWithAllStreamData(InterpreterFactory::get(query_ast, local_context)->execute().in);
|
|
|
|
std::set<String> res;
|
|
if (block)
|
|
{
|
|
ColumnWithTypeAndName & column = block.getByPosition(0);
|
|
task_shard.partition_key_column = column;
|
|
|
|
for (size_t i = 0; i < column.column->size(); ++i)
|
|
{
|
|
WriteBufferFromOwnString wb;
|
|
column.type->serializeAsTextQuoted(*column.column, i, wb, FormatSettings());
|
|
res.emplace(wb.str());
|
|
}
|
|
}
|
|
|
|
LOG_DEBUG(log, "There are " << res.size() << " destination partitions in shard " << task_shard.getDescription());
|
|
|
|
return res;
|
|
}
|
|
|
|
bool checkShardHasPartition(const ConnectionTimeouts & timeouts, TaskShard & task_shard, const String & partition_quoted_name)
|
|
{
|
|
createShardInternalTables(timeouts, task_shard, false);
|
|
|
|
TaskTable & task_table = task_shard.task_table;
|
|
|
|
std::string query = "SELECT 1 FROM " + getQuotedTable(task_shard.table_read_shard)
|
|
+ " WHERE (" + queryToString(task_table.engine_push_partition_key_ast) + " = (" + partition_quoted_name + " AS partition_key))";
|
|
|
|
if (!task_table.where_condition_str.empty())
|
|
query += " AND (" + task_table.where_condition_str + ")";
|
|
|
|
query += " LIMIT 1";
|
|
|
|
LOG_DEBUG(log, "Checking shard " << task_shard.getDescription() << " for partition "
|
|
<< partition_quoted_name << " existence, executing query: " << query);
|
|
|
|
ParserQuery parser_query(query.data() + query.size());
|
|
ASTPtr query_ast = parseQuery(parser_query, query, 0);
|
|
|
|
Context local_context = context;
|
|
local_context.setSettings(task_cluster->settings_pull);
|
|
return InterpreterFactory::get(query_ast, local_context)->execute().in->read().rows() != 0;
|
|
}
|
|
|
|
/** Executes simple query (without output streams, for example DDL queries) on each shard of the cluster
|
|
* Returns number of shards for which at least one replica executed query successfully
|
|
*/
|
|
UInt64 executeQueryOnCluster(
|
|
const ClusterPtr & cluster,
|
|
const String & query,
|
|
const ASTPtr & query_ast_ = nullptr,
|
|
const Settings * settings = nullptr,
|
|
PoolMode pool_mode = PoolMode::GET_ALL,
|
|
UInt64 max_successful_executions_per_shard = 0) const
|
|
{
|
|
auto num_shards = cluster->getShardsInfo().size();
|
|
std::vector<UInt64> per_shard_num_successful_replicas(num_shards, 0);
|
|
|
|
ASTPtr query_ast;
|
|
if (query_ast_ == nullptr)
|
|
{
|
|
ParserQuery p_query(query.data() + query.size());
|
|
query_ast = parseQuery(p_query, query, 0);
|
|
}
|
|
else
|
|
query_ast = query_ast_;
|
|
|
|
|
|
/// We need to execute query on one replica at least
|
|
auto do_for_shard = [&] (UInt64 shard_index)
|
|
{
|
|
const Cluster::ShardInfo & shard = cluster->getShardsInfo().at(shard_index);
|
|
UInt64 & num_successful_executions = per_shard_num_successful_replicas.at(shard_index);
|
|
num_successful_executions = 0;
|
|
|
|
auto increment_and_check_exit = [&] () -> bool
|
|
{
|
|
++num_successful_executions;
|
|
return max_successful_executions_per_shard && num_successful_executions >= max_successful_executions_per_shard;
|
|
};
|
|
|
|
UInt64 num_replicas = cluster->getShardsAddresses().at(shard_index).size();
|
|
UInt64 num_local_replicas = shard.getLocalNodeCount();
|
|
UInt64 num_remote_replicas = num_replicas - num_local_replicas;
|
|
|
|
/// In that case we don't have local replicas, but do it just in case
|
|
for (UInt64 i = 0; i < num_local_replicas; ++i)
|
|
{
|
|
auto interpreter = InterpreterFactory::get(query_ast, context);
|
|
interpreter->execute();
|
|
|
|
if (increment_and_check_exit())
|
|
return;
|
|
}
|
|
|
|
/// Will try to make as many as possible queries
|
|
if (shard.hasRemoteConnections())
|
|
{
|
|
Settings current_settings = settings ? *settings : task_cluster->settings_common;
|
|
current_settings.max_parallel_replicas = num_remote_replicas ? num_remote_replicas : 1;
|
|
|
|
auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(current_settings).getSaturated(current_settings.max_execution_time);
|
|
auto connections = shard.pool->getMany(timeouts, ¤t_settings, pool_mode);
|
|
|
|
for (auto & connection : connections)
|
|
{
|
|
if (connection.isNull())
|
|
continue;
|
|
|
|
try
|
|
{
|
|
/// CREATE TABLE and DROP PARTITION queries return empty block
|
|
RemoteBlockInputStream stream{*connection, query, Block{}, context, ¤t_settings};
|
|
NullBlockOutputStream output{Block{}};
|
|
copyData(stream, output);
|
|
|
|
if (increment_and_check_exit())
|
|
return;
|
|
}
|
|
catch (const Exception &)
|
|
{
|
|
LOG_INFO(log, getCurrentExceptionMessage(false, true));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
{
|
|
ThreadPool thread_pool(std::min<UInt64>(num_shards, getNumberOfPhysicalCPUCores()));
|
|
|
|
for (UInt64 shard_index = 0; shard_index < num_shards; ++shard_index)
|
|
thread_pool.scheduleOrThrowOnError([=] { do_for_shard(shard_index); });
|
|
|
|
thread_pool.wait();
|
|
}
|
|
|
|
UInt64 successful_shards = 0;
|
|
for (UInt64 num_replicas : per_shard_num_successful_replicas)
|
|
successful_shards += (num_replicas > 0);
|
|
|
|
return successful_shards;
|
|
}
|
|
|
|
private:
|
|
String task_zookeeper_path;
|
|
String task_description_path;
|
|
String host_id;
|
|
String working_database_name;
|
|
|
|
/// Auto update config stuff
|
|
UInt64 task_descprtion_current_version = 1;
|
|
std::atomic<UInt64> task_descprtion_version{1};
|
|
Coordination::WatchCallback task_description_watch_callback;
|
|
/// ZooKeeper session used to set the callback
|
|
zkutil::ZooKeeperPtr task_description_watch_zookeeper;
|
|
|
|
ConfigurationPtr task_cluster_initial_config;
|
|
ConfigurationPtr task_cluster_current_config;
|
|
Coordination::Stat task_description_current_stat{};
|
|
|
|
std::unique_ptr<TaskCluster> task_cluster;
|
|
|
|
bool is_safe_mode = false;
|
|
double copy_fault_probability = 0.0;
|
|
|
|
Context & context;
|
|
Poco::Logger * log;
|
|
|
|
std::chrono::milliseconds default_sleep_time{1000};
|
|
};
|
|
|
|
|
|
/// ClusterCopierApp
|
|
|
|
|
|
void ClusterCopierApp::initialize(Poco::Util::Application & self)
|
|
{
|
|
is_help = config().has("help");
|
|
if (is_help)
|
|
return;
|
|
|
|
config_xml_path = config().getString("config-file");
|
|
task_path = config().getString("task-path");
|
|
log_level = config().getString("log-level", "trace");
|
|
is_safe_mode = config().has("safe-mode");
|
|
if (config().has("copy-fault-probability"))
|
|
copy_fault_probability = std::max(std::min(config().getDouble("copy-fault-probability"), 1.0), 0.0);
|
|
base_dir = (config().has("base-dir")) ? config().getString("base-dir") : Poco::Path::current();
|
|
// process_id is '<hostname>#<start_timestamp>_<pid>'
|
|
time_t timestamp = Poco::Timestamp().epochTime();
|
|
auto curr_pid = Poco::Process::id();
|
|
|
|
process_id = std::to_string(DateLUT::instance().toNumYYYYMMDDhhmmss(timestamp)) + "_" + std::to_string(curr_pid);
|
|
host_id = escapeForFileName(getFQDNOrHostName()) + '#' + process_id;
|
|
process_path = Poco::Path(base_dir + "/clickhouse-copier_" + process_id).absolute().toString();
|
|
Poco::File(process_path).createDirectories();
|
|
|
|
/// Override variables for BaseDaemon
|
|
if (config().has("log-level"))
|
|
config().setString("logger.level", config().getString("log-level"));
|
|
|
|
if (config().has("base-dir") || !config().has("logger.log"))
|
|
config().setString("logger.log", process_path + "/log.log");
|
|
|
|
if (config().has("base-dir") || !config().has("logger.errorlog"))
|
|
config().setString("logger.errorlog", process_path + "/log.err.log");
|
|
|
|
Base::initialize(self);
|
|
}
|
|
|
|
|
|
void ClusterCopierApp::handleHelp(const std::string &, const std::string &)
|
|
{
|
|
Poco::Util::HelpFormatter helpFormatter(options());
|
|
helpFormatter.setCommand(commandName());
|
|
helpFormatter.setHeader("Copies tables from one cluster to another");
|
|
helpFormatter.setUsage("--config-file <config-file> --task-path <task-path>");
|
|
helpFormatter.format(std::cerr);
|
|
|
|
stopOptionsProcessing();
|
|
}
|
|
|
|
|
|
void ClusterCopierApp::defineOptions(Poco::Util::OptionSet & options)
|
|
{
|
|
Base::defineOptions(options);
|
|
|
|
options.addOption(Poco::Util::Option("task-path", "", "path to task in ZooKeeper")
|
|
.argument("task-path").binding("task-path"));
|
|
options.addOption(Poco::Util::Option("task-file", "", "path to task file for uploading in ZooKeeper to task-path")
|
|
.argument("task-file").binding("task-file"));
|
|
options.addOption(Poco::Util::Option("task-upload-force", "", "Force upload task-file even node already exists")
|
|
.argument("task-upload-force").binding("task-upload-force"));
|
|
options.addOption(Poco::Util::Option("safe-mode", "", "disables ALTER DROP PARTITION in case of errors")
|
|
.binding("safe-mode"));
|
|
options.addOption(Poco::Util::Option("copy-fault-probability", "", "the copying fails with specified probability (used to test partition state recovering)")
|
|
.argument("copy-fault-probability").binding("copy-fault-probability"));
|
|
options.addOption(Poco::Util::Option("log-level", "", "sets log level")
|
|
.argument("log-level").binding("log-level"));
|
|
options.addOption(Poco::Util::Option("base-dir", "", "base directory for copiers, consecutive copier launches will populate /base-dir/launch_id/* directories")
|
|
.argument("base-dir").binding("base-dir"));
|
|
|
|
using Me = std::decay_t<decltype(*this)>;
|
|
options.addOption(Poco::Util::Option("help", "", "produce this help message").binding("help")
|
|
.callback(Poco::Util::OptionCallback<Me>(this, &Me::handleHelp)));
|
|
}
|
|
|
|
|
|
void ClusterCopierApp::mainImpl()
|
|
{
|
|
StatusFile status_file(process_path + "/status");
|
|
ThreadStatus thread_status;
|
|
|
|
auto log = &logger();
|
|
LOG_INFO(log, "Starting clickhouse-copier ("
|
|
<< "id " << process_id << ", "
|
|
<< "host_id " << host_id << ", "
|
|
<< "path " << process_path << ", "
|
|
<< "revision " << ClickHouseRevision::get() << ")");
|
|
|
|
auto context = std::make_unique<Context>(Context::createGlobal());
|
|
context->makeGlobalContext();
|
|
SCOPE_EXIT(context->shutdown());
|
|
|
|
context->setConfig(loaded_config.configuration);
|
|
context->setApplicationType(Context::ApplicationType::LOCAL);
|
|
context->setPath(process_path);
|
|
|
|
registerFunctions();
|
|
registerAggregateFunctions();
|
|
registerTableFunctions();
|
|
registerStorages();
|
|
registerDictionaries();
|
|
registerDisks();
|
|
|
|
static const std::string default_database = "_local";
|
|
context->addDatabase(default_database, std::make_shared<DatabaseMemory>(default_database));
|
|
context->setCurrentDatabase(default_database);
|
|
|
|
/// Initialize query scope just in case.
|
|
CurrentThread::QueryScope query_scope(*context);
|
|
|
|
auto copier = std::make_unique<ClusterCopier>(task_path, host_id, default_database, *context);
|
|
copier->setSafeMode(is_safe_mode);
|
|
copier->setCopyFaultProbability(copy_fault_probability);
|
|
|
|
auto task_file = config().getString("task-file", "");
|
|
if (!task_file.empty())
|
|
copier->uploadTaskDescription(task_path, task_file, config().getBool("task-upload-force", false));
|
|
|
|
copier->init();
|
|
copier->process(ConnectionTimeouts::getTCPTimeoutsWithoutFailover(context->getSettingsRef()));
|
|
|
|
/// Reset ZooKeeper before removing ClusterCopier.
|
|
/// Otherwise zookeeper watch can call callback which use already removed ClusterCopier object.
|
|
context->resetZooKeeper();
|
|
}
|
|
|
|
|
|
int ClusterCopierApp::main(const std::vector<std::string> &)
|
|
{
|
|
if (is_help)
|
|
return 0;
|
|
|
|
try
|
|
{
|
|
mainImpl();
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException(&Poco::Logger::root(), __PRETTY_FUNCTION__);
|
|
auto code = getCurrentExceptionCode();
|
|
|
|
return (code) ? code : -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
}
|
|
|
|
#pragma GCC diagnostic ignored "-Wunused-function"
|
|
#pragma GCC diagnostic ignored "-Wmissing-declarations"
|
|
|
|
int mainEntryClickHouseClusterCopier(int argc, char ** argv)
|
|
{
|
|
try
|
|
{
|
|
DB::ClusterCopierApp app;
|
|
return app.run(argc, argv);
|
|
}
|
|
catch (...)
|
|
{
|
|
std::cerr << DB::getCurrentExceptionMessage(true) << "\n";
|
|
auto code = DB::getCurrentExceptionCode();
|
|
|
|
return (code) ? code : -1;
|
|
}
|
|
}
|