ClickHouse/dbms/include/DB/Storages/Distributed/DirectoryMonitor.h

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#pragma once
#include <DB/DataStreams/RemoteBlockOutputStream.h>
#include <DB/Common/escapeForFileName.h>
#include <DB/Storages/StorageDistributed.h>
#include <boost/algorithm/string/find_iterator.hpp>
#include <boost/algorithm/string/finder.hpp>
#include <thread>
#include <mutex>
namespace DB
{
namespace
{
static constexpr const std::chrono::seconds max_sleep_time{30};
static constexpr const std::chrono::minutes decrease_error_count_period{5};
template <typename PoolFactory>
ConnectionPools createPoolsForAddresses(const std::string & name, PoolFactory && factory)
{
ConnectionPools pools;
for (auto it = boost::make_split_iterator(name, boost::first_finder(",")); it != decltype(it){}; ++it)
{
const auto address = boost::copy_range<std::string>(*it);
const auto user_pw_end = strchr(address.data(), '@');
const auto colon = strchr(address.data(), ':');
if (!user_pw_end || !colon)
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throw Exception{
"Shard address '" + address + "' does not match to 'user[:password]@host:port' pattern",
ErrorCodes::INCORRECT_FILE_NAME
};
const auto has_pw = colon < user_pw_end;
const auto host_end = has_pw ? strchr(user_pw_end + 1, ':') : colon;
if (!host_end)
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throw Exception{
"Shard address '" + address + "' does not contain port",
ErrorCodes::INCORRECT_FILE_NAME
};
const auto user = unescapeForFileName({address.data(), has_pw ? colon : user_pw_end});
const auto password = has_pw ? unescapeForFileName({colon + 1, user_pw_end}) : std::string{};
const auto host = unescapeForFileName({user_pw_end + 1, host_end});
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const auto port = parse<UInt16>(host_end + 1);
pools.emplace_back(factory(host, port, user, password));
}
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return pools;
}
}
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/** Implementation for StorageDistributed::DirectoryMonitor nested class.
* This type is not designed for standalone use. */
class StorageDistributed::DirectoryMonitor
{
public:
DirectoryMonitor(StorageDistributed & storage, const std::string & name)
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: storage(storage), pool{createPool(name)}, path{storage.path + name + '/'}
, default_sleep_time{storage.context.getSettingsRef().distributed_directory_monitor_sleep_time_ms.totalMilliseconds()}
, sleep_time{default_sleep_time}
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, log{&Logger::get(getLoggerName())}
{
}
~DirectoryMonitor()
{
{
quit = true;
std::lock_guard<std::mutex> lock{mutex};
}
cond.notify_one();
thread.join();
}
private:
void run()
{
std::unique_lock<std::mutex> lock{mutex};
const auto quit_requested = [this] { return quit; };
while (!quit_requested())
{
auto do_sleep = true;
try
{
do_sleep = !findFiles();
}
catch (...)
{
do_sleep = true;
++error_count;
sleep_time = std::min(
std::chrono::milliseconds{std::int64_t(default_sleep_time.count() * std::exp2(error_count))},
std::chrono::milliseconds{max_sleep_time});
tryLogCurrentException(getLoggerName().data());
};
if (do_sleep)
cond.wait_for(lock, sleep_time, quit_requested);
const auto now = std::chrono::system_clock::now();
if (now - last_decrease_time > decrease_error_count_period)
{
error_count /= 2;
last_decrease_time = now;
}
}
}
ConnectionPoolPtr createPool(const std::string & name)
{
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const auto pool_factory = [this, &name] (const std::string & host, const UInt16 port,
const std::string & user, const std::string & password) {
return new ConnectionPool{
1, host, port, "",
user, password, storage.context.getDataTypeFactory(),
storage.getName() + '_' + name};
};
auto pools = createPoolsForAddresses(name, pool_factory);
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return pools.size() == 1 ? pools.front() : new ConnectionPoolWithFailover(pools, LoadBalancing::RANDOM);
}
bool findFiles()
{
std::map<UInt64, std::string> files;
Poco::DirectoryIterator end;
for (Poco::DirectoryIterator it{path}; it != end; ++it)
{
const auto & file_path_str = it->path();
Poco::Path file_path{file_path_str};
if (!it->isDirectory() && 0 == strncmp(file_path.getExtension().data(), "bin", strlen("bin")))
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files[parse<UInt64>(file_path.getBaseName())] = file_path_str;
}
if (files.empty())
return false;
for (const auto & file : files)
{
if (quit)
return true;
processFile(file.second);
}
return true;
}
void processFile(const std::string & file_path)
{
LOG_TRACE(log, "Started processing `" << file_path << '`');
auto connection = pool->get();
try
{
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ReadBufferFromFile in{file_path};
std::string insert_query;
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readStringBinary(insert_query, in);
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RemoteBlockOutputStream remote{*connection, insert_query};
remote.writePrefix();
remote.writePrepared(in);
remote.writeSuffix();
}
catch (const Exception & e)
{
const auto code = e.code();
/// mark file as broken if necessary
if (code == ErrorCodes::CHECKSUM_DOESNT_MATCH ||
code == ErrorCodes::TOO_LARGE_SIZE_COMPRESSED ||
code == ErrorCodes::CANNOT_READ_ALL_DATA)
{
const auto last_path_separator_pos = file_path.rfind('/');
const auto & path = file_path.substr(0, last_path_separator_pos + 1);
const auto & file_name = file_path.substr(last_path_separator_pos + 1);
const auto & broken_path = path + "broken/";
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const auto & broken_file_path = broken_path + file_name;
Poco::File{broken_path}.createDirectory();
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Poco::File{file_path}.renameTo(broken_file_path);
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LOG_ERROR(log, "Renamed `" << file_path << "` to `" << broken_file_path << '`');
}
throw;
}
Poco::File{file_path}.remove();
LOG_TRACE(log, "Finished processing `" << file_path << '`');
}
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std::string getLoggerName() const
{
return storage.name + '.' + storage.getName() + ".DirectoryMonitor";
}
StorageDistributed & storage;
ConnectionPoolPtr pool;
std::string path;
std::size_t error_count{};
std::chrono::milliseconds default_sleep_time;
std::chrono::milliseconds sleep_time;
std::chrono::time_point<std::chrono::system_clock> last_decrease_time{
std::chrono::system_clock::now()
};
bool quit{false};
std::mutex mutex;
std::condition_variable cond;
Logger * log;
std::thread thread{&DirectoryMonitor::run, this};
};
}