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205 lines
9.3 KiB
C++
205 lines
9.3 KiB
C++
#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <Storages/System/StorageSystemReplicas.h>
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#include <Storages/StorageReplicatedMergeTree.h>
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#include <Storages/VirtualColumnUtils.h>
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#include <Access/ContextAccess.h>
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#include <Common/typeid_cast.h>
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#include <Databases/IDatabase.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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namespace DB
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{
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StorageSystemReplicas::StorageSystemReplicas(const std::string & name_)
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: IStorage({"system", name_})
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{
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setColumns(ColumnsDescription({
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{ "database", std::make_shared<DataTypeString>() },
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{ "table", std::make_shared<DataTypeString>() },
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{ "engine", std::make_shared<DataTypeString>() },
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{ "is_leader", std::make_shared<DataTypeUInt8>() },
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{ "can_become_leader", std::make_shared<DataTypeUInt8>() },
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{ "is_readonly", std::make_shared<DataTypeUInt8>() },
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{ "is_session_expired", std::make_shared<DataTypeUInt8>() },
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{ "future_parts", std::make_shared<DataTypeUInt32>() },
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{ "parts_to_check", std::make_shared<DataTypeUInt32>() },
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{ "zookeeper_path", std::make_shared<DataTypeString>() },
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{ "replica_name", std::make_shared<DataTypeString>() },
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{ "replica_path", std::make_shared<DataTypeString>() },
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{ "columns_version", std::make_shared<DataTypeInt32>() },
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{ "queue_size", std::make_shared<DataTypeUInt32>() },
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{ "inserts_in_queue", std::make_shared<DataTypeUInt32>() },
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{ "merges_in_queue", std::make_shared<DataTypeUInt32>() },
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{ "part_mutations_in_queue", std::make_shared<DataTypeUInt32>() },
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{ "queue_oldest_time", std::make_shared<DataTypeDateTime>() },
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{ "inserts_oldest_time", std::make_shared<DataTypeDateTime>() },
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{ "merges_oldest_time", std::make_shared<DataTypeDateTime>() },
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{ "part_mutations_oldest_time", std::make_shared<DataTypeDateTime>() },
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{ "oldest_part_to_get", std::make_shared<DataTypeString>() },
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{ "oldest_part_to_merge_to", std::make_shared<DataTypeString>() },
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{ "oldest_part_to_mutate_to", std::make_shared<DataTypeString>() },
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{ "log_max_index", std::make_shared<DataTypeUInt64>() },
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{ "log_pointer", std::make_shared<DataTypeUInt64>() },
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{ "last_queue_update", std::make_shared<DataTypeDateTime>() },
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{ "absolute_delay", std::make_shared<DataTypeUInt64>() },
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{ "total_replicas", std::make_shared<DataTypeUInt8>() },
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{ "active_replicas", std::make_shared<DataTypeUInt8>() },
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{ "zookeeper_exception", std::make_shared<DataTypeString>() },
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}));
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}
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Pipes StorageSystemReplicas::read(
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const Names & column_names,
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const SelectQueryInfo & query_info,
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const Context & context,
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QueryProcessingStage::Enum /*processed_stage*/,
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const size_t /*max_block_size*/,
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const unsigned /*num_streams*/)
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{
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check(column_names);
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const auto access = context.getAccess();
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const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_TABLES);
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/// We collect a set of replicated tables.
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std::map<String, std::map<String, StoragePtr>> replicated_tables;
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for (const auto & db : DatabaseCatalog::instance().getDatabases())
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{
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/// Lazy database can not contain replicated tables
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if (db.second->getEngineName() == "Lazy")
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continue;
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const bool check_access_for_tables = check_access_for_databases && !access->isGranted(AccessType::SHOW_TABLES, db.first);
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for (auto iterator = db.second->getTablesIterator(context); iterator->isValid(); iterator->next())
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{
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if (!dynamic_cast<const StorageReplicatedMergeTree *>(iterator->table().get()))
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continue;
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if (check_access_for_tables && !access->isGranted(AccessType::SHOW_TABLES, db.first, iterator->name()))
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continue;
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replicated_tables[db.first][iterator->name()] = iterator->table();
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}
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}
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/// Do you need columns that require a ZooKeeper request to compute.
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bool with_zk_fields = false;
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for (const auto & column_name : column_names)
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{
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if ( column_name == "log_max_index"
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|| column_name == "log_pointer"
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|| column_name == "total_replicas"
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|| column_name == "active_replicas"
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|| column_name == "zookeeper_exception")
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{
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with_zk_fields = true;
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break;
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}
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}
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MutableColumnPtr col_database_mut = ColumnString::create();
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MutableColumnPtr col_table_mut = ColumnString::create();
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MutableColumnPtr col_engine_mut = ColumnString::create();
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for (auto & db : replicated_tables)
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{
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for (auto & table : db.second)
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{
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col_database_mut->insert(db.first);
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col_table_mut->insert(table.first);
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col_engine_mut->insert(table.second->getName());
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}
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}
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ColumnPtr col_database = std::move(col_database_mut);
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ColumnPtr col_table = std::move(col_table_mut);
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ColumnPtr col_engine = std::move(col_engine_mut);
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/// Determine what tables are needed by the conditions in the query.
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{
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Block filtered_block
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{
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{ col_database, std::make_shared<DataTypeString>(), "database" },
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{ col_table, std::make_shared<DataTypeString>(), "table" },
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{ col_engine, std::make_shared<DataTypeString>(), "engine" },
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};
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VirtualColumnUtils::filterBlockWithQuery(query_info.query, filtered_block, context);
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if (!filtered_block.rows())
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return Pipes();
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col_database = filtered_block.getByName("database").column;
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col_table = filtered_block.getByName("table").column;
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col_engine = filtered_block.getByName("engine").column;
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}
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MutableColumns res_columns = getSampleBlock().cloneEmptyColumns();
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for (size_t i = 0, size = col_database->size(); i < size; ++i)
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{
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StorageReplicatedMergeTree::Status status;
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dynamic_cast<StorageReplicatedMergeTree &>(
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*replicated_tables
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[(*col_database)[i].safeGet<const String &>()]
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[(*col_table)[i].safeGet<const String &>()]).getStatus(status, with_zk_fields);
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size_t col_num = 3;
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res_columns[col_num++]->insert(status.is_leader);
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res_columns[col_num++]->insert(status.can_become_leader);
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res_columns[col_num++]->insert(status.is_readonly);
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res_columns[col_num++]->insert(status.is_session_expired);
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res_columns[col_num++]->insert(status.queue.future_parts);
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res_columns[col_num++]->insert(status.parts_to_check);
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res_columns[col_num++]->insert(status.zookeeper_path);
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res_columns[col_num++]->insert(status.replica_name);
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res_columns[col_num++]->insert(status.replica_path);
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res_columns[col_num++]->insert(status.columns_version);
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res_columns[col_num++]->insert(status.queue.queue_size);
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res_columns[col_num++]->insert(status.queue.inserts_in_queue);
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res_columns[col_num++]->insert(status.queue.merges_in_queue);
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res_columns[col_num++]->insert(status.queue.part_mutations_in_queue);
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res_columns[col_num++]->insert(status.queue.queue_oldest_time);
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res_columns[col_num++]->insert(status.queue.inserts_oldest_time);
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res_columns[col_num++]->insert(status.queue.merges_oldest_time);
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res_columns[col_num++]->insert(status.queue.part_mutations_oldest_time);
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res_columns[col_num++]->insert(status.queue.oldest_part_to_get);
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res_columns[col_num++]->insert(status.queue.oldest_part_to_merge_to);
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res_columns[col_num++]->insert(status.queue.oldest_part_to_mutate_to);
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res_columns[col_num++]->insert(status.log_max_index);
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res_columns[col_num++]->insert(status.log_pointer);
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res_columns[col_num++]->insert(status.queue.last_queue_update);
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res_columns[col_num++]->insert(status.absolute_delay);
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res_columns[col_num++]->insert(status.total_replicas);
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res_columns[col_num++]->insert(status.active_replicas);
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res_columns[col_num++]->insert(status.zookeeper_exception);
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}
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Block header = getSampleBlock();
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Columns fin_columns;
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fin_columns.reserve(res_columns.size());
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for (auto & col : res_columns)
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fin_columns.emplace_back(std::move(col));
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fin_columns[0] = std::move(col_database);
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fin_columns[1] = std::move(col_table);
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fin_columns[2] = std::move(col_engine);
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UInt64 num_rows = fin_columns.at(0)->size();
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Chunk chunk(std::move(fin_columns), num_rows);
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Pipes pipes;
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pipes.emplace_back(std::make_shared<SourceFromSingleChunk>(getSampleBlock(), std::move(chunk)));
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return pipes;
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}
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}
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