ClickHouse/src/Storages/StorageS3Distributed.cpp

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#include "Storages/StorageS3Distributed.h"
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#if !defined(ARCADIA_BUILD)
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#include <Common/config.h>
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#endif
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#if USE_AWS_S3
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#include "Common/Exception.h"
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#include <Common/Throttler.h>
#include "Client/Connection.h"
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#include "Core/QueryProcessingStage.h"
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#include <Core/UUID.h>
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#include "DataStreams/RemoteBlockInputStream.h"
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeString.h>
#include <IO/ReadBufferFromS3.h>
#include <IO/ReadHelpers.h>
#include <IO/WriteBufferFromS3.h>
#include <IO/WriteHelpers.h>
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#include <Interpreters/Context.h>
#include <Interpreters/getHeaderForProcessingStage.h>
#include <Interpreters/SelectQueryOptions.h>
#include <Interpreters/InterpreterSelectQuery.h>
#include <Interpreters/getTableExpressions.h>
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#include <Formats/FormatFactory.h>
#include <DataStreams/IBlockOutputStream.h>
#include <DataStreams/AddingDefaultsBlockInputStream.h>
#include <DataStreams/narrowBlockInputStreams.h>
#include <Processors/Formats/InputStreamFromInputFormat.h>
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#include <Processors/Pipe.h>
#include <Processors/Sources/SourceFromInputStream.h>
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#include "Processors/Sources/SourceWithProgress.h"
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#include <Processors/Sources/RemoteSource.h>
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#include <Parsers/queryToString.h>
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#include <Parsers/ASTTablesInSelectQuery.h>
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#include <Storages/IStorage.h>
#include <Storages/SelectQueryInfo.h>
#include <common/logger_useful.h>
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#include <aws/core/auth/AWSCredentials.h>
#include <aws/s3/S3Client.h>
#include <aws/s3/model/ListObjectsV2Request.h>
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#include <ios>
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#include <memory>
#include <string>
#include <thread>
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#include <cassert>
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namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
StorageS3Distributed::StorageS3Distributed(
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const String & filename_,
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const String & access_key_id_,
const String & secret_access_key_,
const StorageID & table_id_,
String cluster_name_,
const String & format_name_,
UInt64 max_connections_,
const ColumnsDescription & columns_,
const ConstraintsDescription & constraints_,
const Context & context_,
const String & compression_method_)
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: IStorage(table_id_)
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, client_auth{S3::URI{Poco::URI{filename_}}, access_key_id_, secret_access_key_, max_connections_, {}, {}} /// Client and settings will be updated later
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, filename(filename_)
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, cluster_name(cluster_name_)
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, cluster(context_.getCluster(cluster_name)->getClusterWithReplicasAsShards(context_.getSettings()))
, format_name(format_name_)
, compression_method(compression_method_)
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{
StorageInMemoryMetadata storage_metadata;
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storage_metadata.setColumns(columns_);
storage_metadata.setConstraints(constraints_);
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setInMemoryMetadata(storage_metadata);
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StorageS3::updateClientAndAuthSettings(context_, client_auth);
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}
Pipe StorageS3Distributed::read(
const Names & column_names,
const StorageMetadataPtr & metadata_snapshot,
SelectQueryInfo & query_info,
const Context & context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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unsigned /*num_streams*/)
{
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StorageS3::updateClientAndAuthSettings(context, client_auth);
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/// Secondary query, need to read from S3
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if (context.getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY)
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{
bool need_path_column = false;
bool need_file_column = false;
for (const auto & column : column_names)
{
if (column == "_path")
need_path_column = true;
if (column == "_file")
need_file_column = true;
}
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/// Save callback not to capture context by reference of copy it.
auto file_iterator = std::make_shared<StorageS3Source::IteratorWrapper>(
[callback = context.getReadTaskCallback()]() -> std::optional<String> {
return callback();
});
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return Pipe(std::make_shared<StorageS3Source>(
need_path_column, need_file_column, format_name, getName(),
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metadata_snapshot->getSampleBlock(), context,
metadata_snapshot->getColumns(), max_block_size,
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compression_method,
client_auth.client,
client_auth.uri.bucket,
file_iterator
));
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}
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/// The code from here and below executes on initiator
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S3::URI s3_uri(Poco::URI{filename});
StorageS3::updateClientAndAuthSettings(context, client_auth);
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auto iterator = std::make_shared<StorageS3Source::DisclosedGlobIterator>(*client_auth.client, client_auth.uri);
auto callback = std::make_shared<StorageS3Source::IteratorWrapper>([iterator]() mutable -> std::optional<String>
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{
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return iterator->next();
});
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/// Calculate the header. This is significant, because some columns could be thrown away in some cases like query with count(*)
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Block header =
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InterpreterSelectQuery(query_info.query, context, SelectQueryOptions(processed_stage).analyze()).getSampleBlock();
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const Scalars & scalars = context.hasQueryContext() ? context.getQueryContext().getScalars() : Scalars{};
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Pipes pipes;
connections.reserve(cluster->getShardCount());
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for (const auto & replicas : cluster->getShardsAddresses()) {
/// There will be only one replica, because we consider each replica as a shard
for (const auto & node : replicas)
{
connections.emplace_back(std::make_shared<Connection>(
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node.host_name, node.port, context.getGlobalContext().getCurrentDatabase(),
node.user, node.password, node.cluster, node.cluster_secret,
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"S3DistributedInititiator",
node.compression,
node.secure
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));
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/// For unknown reason global context is passed to IStorage::read() method
/// So, task_identifier is passed as constructor argument. It is more obvious.
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auto remote_query_executor = std::make_shared<RemoteQueryExecutor>(
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*connections.back(), queryToString(query_info.query), header, context,
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/*throttler=*/nullptr, scalars, Tables(), processed_stage, callback);
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pipes.emplace_back(std::make_shared<RemoteSource>(remote_query_executor, false, false));
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}
}
metadata_snapshot->check(column_names, getVirtuals(), getStorageID());
return Pipe::unitePipes(std::move(pipes));
}
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QueryProcessingStage::Enum StorageS3Distributed::getQueryProcessingStage(
const Context & context, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const
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{
/// Initiator executes query on remote node.
if (context.getClientInfo().query_kind == ClientInfo::QueryKind::INITIAL_QUERY) {
return QueryProcessingStage::Enum::WithMergeableState;
}
/// Follower just reads the data.
return QueryProcessingStage::Enum::FetchColumns;
}
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}
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#endif