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355 lines
11 KiB
C++
355 lines
11 KiB
C++
#include <Common/config.h>
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#if USE_HDFS
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#include <Storages/StorageFactory.h>
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#include <Storages/StorageHDFS.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Parsers/ASTLiteral.h>
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#include <IO/ReadHelpers.h>
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#include <IO/ReadBufferFromHDFS.h>
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#include <IO/WriteBufferFromHDFS.h>
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#include <IO/WriteHelpers.h>
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#include <IO/HDFSCommon.h>
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#include <Formats/FormatFactory.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataStreams/IBlockOutputStream.h>
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#include <DataStreams/OwningBlockInputStream.h>
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#include <DataStreams/IBlockInputStream.h>
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#include <DataStreams/narrowBlockInputStreams.h>
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#include <Common/parseGlobs.h>
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#include <Poco/URI.h>
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#include <re2/re2.h>
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#include <re2/stringpiece.h>
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#include <hdfs/hdfs.h>
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#include <Processors/Sources/SourceWithProgress.h>
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#include <Processors/Pipe.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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StorageHDFS::StorageHDFS(const String & uri_,
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const StorageID & table_id_,
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const String & format_name_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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Context & context_,
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const String & compression_method_ = "")
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: IStorage(table_id_)
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, uri(uri_)
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, format_name(format_name_)
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, context(context_)
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, compression_method(compression_method_)
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{
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context.getRemoteHostFilter().checkURL(Poco::URI(uri));
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StorageInMemoryMetadata storage_metadata;
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storage_metadata.setColumns(columns_);
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storage_metadata.setConstraints(constraints_);
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setInMemoryMetadata(storage_metadata);
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}
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namespace
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{
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class HDFSSource : public SourceWithProgress
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{
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public:
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struct SourcesInfo
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{
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std::vector<String> uris;
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std::atomic<size_t> next_uri_to_read = 0;
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bool need_path_column = false;
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bool need_file_column = false;
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};
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using SourcesInfoPtr = std::shared_ptr<SourcesInfo>;
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static Block getHeader(Block header, bool need_path_column, bool need_file_column)
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{
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if (need_path_column)
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header.insert({DataTypeString().createColumn(), std::make_shared<DataTypeString>(), "_path"});
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if (need_file_column)
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header.insert({DataTypeString().createColumn(), std::make_shared<DataTypeString>(), "_file"});
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return header;
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}
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HDFSSource(
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SourcesInfoPtr source_info_,
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String uri_,
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String format_,
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String compression_method_,
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Block sample_block_,
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const Context & context_,
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UInt64 max_block_size_)
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: SourceWithProgress(getHeader(sample_block_, source_info_->need_path_column, source_info_->need_file_column))
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, source_info(std::move(source_info_))
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, uri(std::move(uri_))
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, format(std::move(format_))
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, compression_method(compression_method_)
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, max_block_size(max_block_size_)
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, sample_block(std::move(sample_block_))
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, context(context_)
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{
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}
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String getName() const override
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{
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return "HDFS";
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}
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Chunk generate() override
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{
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while (true)
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{
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if (!reader)
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{
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auto pos = source_info->next_uri_to_read.fetch_add(1);
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if (pos >= source_info->uris.size())
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return {};
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auto path = source_info->uris[pos];
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current_path = uri + path;
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auto compression = chooseCompressionMethod(path, compression_method);
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auto read_buf = wrapReadBufferWithCompressionMethod(std::make_unique<ReadBufferFromHDFS>(current_path), compression);
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auto input_stream = FormatFactory::instance().getInput(format, *read_buf, sample_block, context, max_block_size);
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reader = std::make_shared<OwningBlockInputStream<ReadBuffer>>(input_stream, std::move(read_buf));
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reader->readPrefix();
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}
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if (auto res = reader->read())
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{
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Columns columns = res.getColumns();
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UInt64 num_rows = res.rows();
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/// Enrich with virtual columns.
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if (source_info->need_path_column)
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{
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auto column = DataTypeString().createColumnConst(num_rows, current_path);
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columns.push_back(column->convertToFullColumnIfConst());
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}
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if (source_info->need_file_column)
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{
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size_t last_slash_pos = current_path.find_last_of('/');
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auto file_name = current_path.substr(last_slash_pos + 1);
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auto column = DataTypeString().createColumnConst(num_rows, std::move(file_name));
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columns.push_back(column->convertToFullColumnIfConst());
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}
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return Chunk(std::move(columns), num_rows);
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}
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reader->readSuffix();
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reader.reset();
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}
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}
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private:
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BlockInputStreamPtr reader;
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SourcesInfoPtr source_info;
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String uri;
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String format;
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String compression_method;
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String current_path;
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UInt64 max_block_size;
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Block sample_block;
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const Context & context;
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};
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class HDFSBlockOutputStream : public IBlockOutputStream
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{
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public:
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HDFSBlockOutputStream(const String & uri,
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const String & format,
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const Block & sample_block_,
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const Context & context,
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const CompressionMethod compression_method)
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: sample_block(sample_block_)
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{
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write_buf = wrapWriteBufferWithCompressionMethod(std::make_unique<WriteBufferFromHDFS>(uri), compression_method, 3);
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writer = FormatFactory::instance().getOutput(format, *write_buf, sample_block, context);
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}
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Block getHeader() const override
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{
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return sample_block;
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}
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void write(const Block & block) override
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{
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writer->write(block);
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}
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void writePrefix() override
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{
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writer->writePrefix();
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}
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void writeSuffix() override
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{
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writer->writeSuffix();
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writer->flush();
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write_buf->sync();
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}
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private:
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Block sample_block;
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std::unique_ptr<WriteBuffer> write_buf;
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BlockOutputStreamPtr writer;
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};
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/* Recursive directory listing with matched paths as a result.
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* Have the same method in StorageFile.
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*/
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Strings LSWithRegexpMatching(const String & path_for_ls, const HDFSFSPtr & fs, const String & for_match)
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{
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const size_t first_glob = for_match.find_first_of("*?{");
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const size_t end_of_path_without_globs = for_match.substr(0, first_glob).rfind('/');
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const String suffix_with_globs = for_match.substr(end_of_path_without_globs); /// begin with '/'
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const String prefix_without_globs = path_for_ls + for_match.substr(1, end_of_path_without_globs); /// ends with '/'
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const size_t next_slash = suffix_with_globs.find('/', 1);
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re2::RE2 matcher(makeRegexpPatternFromGlobs(suffix_with_globs.substr(0, next_slash)));
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HDFSFileInfo ls;
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ls.file_info = hdfsListDirectory(fs.get(), prefix_without_globs.data(), &ls.length);
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Strings result;
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for (int i = 0; i < ls.length; ++i)
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{
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const String full_path = String(ls.file_info[i].mName);
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const size_t last_slash = full_path.rfind('/');
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const String file_name = full_path.substr(last_slash);
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const bool looking_for_directory = next_slash != std::string::npos;
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const bool is_directory = ls.file_info[i].mKind == 'D';
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/// Condition with type of current file_info means what kind of path is it in current iteration of ls
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if (!is_directory && !looking_for_directory)
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{
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if (re2::RE2::FullMatch(file_name, matcher))
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{
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result.push_back(String(ls.file_info[i].mName));
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}
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}
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else if (is_directory && looking_for_directory)
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{
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if (re2::RE2::FullMatch(file_name, matcher))
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{
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Strings result_part = LSWithRegexpMatching(full_path + "/", fs, suffix_with_globs.substr(next_slash));
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/// Recursion depth is limited by pattern. '*' works only for depth = 1, for depth = 2 pattern path is '*/*'. So we do not need additional check.
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std::move(result_part.begin(), result_part.end(), std::back_inserter(result));
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}
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}
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}
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return result;
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}
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}
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Pipe StorageHDFS::read(
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const Names & column_names,
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const StorageMetadataPtr & metadata_snapshot,
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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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size_t max_block_size,
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unsigned num_streams)
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{
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const size_t begin_of_path = uri.find('/', uri.find("//") + 2);
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const String path_from_uri = uri.substr(begin_of_path);
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const String uri_without_path = uri.substr(0, begin_of_path);
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HDFSBuilderPtr builder = createHDFSBuilder(uri_without_path + "/");
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HDFSFSPtr fs = createHDFSFS(builder.get());
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auto sources_info = std::make_shared<HDFSSource::SourcesInfo>();
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sources_info->uris = LSWithRegexpMatching("/", fs, path_from_uri);
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for (const auto & column : column_names)
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{
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if (column == "_path")
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sources_info->need_path_column = true;
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if (column == "_file")
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sources_info->need_file_column = true;
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}
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if (num_streams > sources_info->uris.size())
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num_streams = sources_info->uris.size();
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Pipes pipes;
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for (size_t i = 0; i < num_streams; ++i)
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pipes.emplace_back(std::make_shared<HDFSSource>(
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sources_info, uri_without_path, format_name, compression_method, metadata_snapshot->getSampleBlock(), context_, max_block_size));
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return Pipe::unitePipes(std::move(pipes));
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}
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BlockOutputStreamPtr StorageHDFS::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & /*context*/)
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{
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return std::make_shared<HDFSBlockOutputStream>(uri,
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format_name,
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metadata_snapshot->getSampleBlock(),
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context,
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chooseCompressionMethod(uri, compression_method));
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}
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void registerStorageHDFS(StorageFactory & factory)
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{
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factory.registerStorage("HDFS", [](const StorageFactory::Arguments & args)
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{
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ASTs & engine_args = args.engine_args;
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if (engine_args.size() != 2 && engine_args.size() != 3)
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throw Exception(
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"Storage HDFS requires 2 or 3 arguments: url, name of used format and optional compression method.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[0], args.local_context);
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String url = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
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engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.local_context);
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String format_name = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
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String compression_method;
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if (engine_args.size() == 3)
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{
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engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.local_context);
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compression_method = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
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} else compression_method = "auto";
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return StorageHDFS::create(url, args.table_id, format_name, args.columns, args.constraints, args.context, compression_method);
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},
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{
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.source_access_type = AccessType::HDFS,
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});
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}
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NamesAndTypesList StorageHDFS::getVirtuals() const
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{
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return NamesAndTypesList{
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{"_path", std::make_shared<DataTypeString>()},
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{"_file", std::make_shared<DataTypeString>()}
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};
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}
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}
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#endif
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