| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| #ifndef KUDU_TABLET_MULTI_COLUMN_WRITER_H |
| #define KUDU_TABLET_MULTI_COLUMN_WRITER_H |
| |
| #include <cstddef> |
| #include <map> |
| #include <string> |
| #include <vector> |
| |
| #include <glog/logging.h> |
| |
| #include "kudu/fs/block_id.h" |
| #include "kudu/gutil/macros.h" |
| #include "kudu/util/status.h" |
| |
| namespace kudu { |
| |
| class FsManager; |
| class RowBlock; |
| class Schema; |
| struct ColumnId; |
| |
| namespace cfile { |
| class CFileWriter; |
| } // namespace cfile |
| |
| namespace fs { |
| class BlockCreationTransaction; |
| } // namespace fs |
| |
| namespace tablet { |
| |
| // Wrapper which writes several columns in parallel corresponding to some |
| // Schema. Written blocks will fall in the tablet_id's data dir group. |
| class MultiColumnWriter { |
| public: |
| MultiColumnWriter(FsManager* fs, |
| const Schema* schema, |
| std::string tablet_id); |
| |
| virtual ~MultiColumnWriter(); |
| |
| // Open and start writing the columns. |
| Status Open(); |
| |
| // Append the given block to the output columns. |
| // |
| // Note that the selection vector here is ignored. |
| Status AppendBlock(const RowBlock& block); |
| |
| // Close the in-progress CFiles, finalizing the underlying writable |
| // blocks and releasing them to 'transaction'. |
| Status FinishAndReleaseBlocks(fs::BlockCreationTransaction* transaction); |
| |
| // Return the number of bytes written so far. |
| size_t written_size() const; |
| |
| cfile::CFileWriter* writer_for_col_idx(int i) { |
| DCHECK_LT(i, cfile_writers_.size()); |
| return cfile_writers_[i]; |
| } |
| |
| // Return the block IDs of the written columns, keyed by column ID. |
| // |
| // REQUIRES: Finish() already called. |
| void GetFlushedBlocksByColumnId(std::map<ColumnId, BlockId>* ret) const; |
| |
| private: |
| FsManager* const fs_; |
| const Schema* const schema_; |
| |
| bool finished_; |
| |
| const std::string tablet_id_; |
| |
| std::vector<cfile::CFileWriter *> cfile_writers_; |
| std::vector<BlockId> block_ids_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MultiColumnWriter); |
| }; |
| |
| } // namespace tablet |
| } // namespace kudu |
| #endif /* KUDU_TABLET_MULTI_COLUMN_WRITER_H */ |