be/src/storage/rowset/segment_creator.h

Source
// 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.

#pragma once

#include <gen_cpp/internal_service.pb.h>
#include <gen_cpp/olap_file.pb.h>

#include <memory>
#include <mutex>
#include <utility>
#include <vector>

#include "common/status.h"
#include "core/block/block.h"
#include "io/fs/file_reader_writer_fwd.h"
#include "storage/index/index_file_writer.h"
#include "storage/rowset/rowset_writer_context.h"
#include "storage/segment/segment_index_file_cache_loader.h"
#include "storage/tablet/tablet_fwd.h"

namespace doris {
class Block;

namespace segment_v2 {
class SegmentWriter;
class VerticalSegmentWriter;
class DerivedColumnGenerator;
// Matches block_transform.h: at most one derived column (the row-store column)
// for each flush, held as a {cid, generator} pair; null generator means none.
using DerivedColumn = std::pair<uint32_t, std::shared_ptr<const DerivedColumnGenerator>>;
} // namespace segment_v2

struct SegmentStatistics;
class BetaRowsetWriter;
class SegmentFileCollection;
class InvertedIndexFileCollection;

class FileWriterCreator {
public:
    virtual ~FileWriterCreator() = default;

    virtual Status create(uint32_t segment_id, io::FileWriterPtr& file_writer,
                          FileType file_type = FileType::SEGMENT_FILE) = 0;

    virtual Status create(uint32_t segment_id, IndexFileWriterPtr* file_writer) = 0;
};

template <class T>
    requires std::is_base_of_v<RowsetWriter, T>
class FileWriterCreatorT : public FileWriterCreator {
public:
    explicit FileWriterCreatorT(T* t) : _t(t) {}

    Status create(uint32_t segment_id, io::FileWriterPtr& file_writer,
                  FileType file_type = FileType::SEGMENT_FILE) override {
        return _t->create_file_writer(segment_id, file_writer, file_type);
    }

    Status create(uint32_t segment_id, IndexFileWriterPtr* file_writer) override {
        return _t->create_index_file_writer(segment_id, file_writer);
    }

private:
    T* _t = nullptr;
};

class SegmentCollector {
public:
    virtual ~SegmentCollector() = default;

    virtual Status add(uint32_t segment_id, SegmentStatistics& segstat) = 0;
};

template <class T>
    requires std::is_base_of_v<RowsetWriter, T>
class SegmentCollectorT : public SegmentCollector {
public:
    explicit SegmentCollectorT(T* t) : _t(t) {}

    Status add(uint32_t segment_id, SegmentStatistics& segstat) override {
        return _t->add_segment(segment_id, segstat);
    }

private:
    T* _t = nullptr;
};

class SegmentFlusher {
public:
    SegmentFlusher(RowsetWriterContext& context, SegmentFileCollection& seg_files,
                   InvertedIndexFileCollection& idx_files);

    ~SegmentFlusher();

    // Runs the block transform chain on `block` and hands back the derived (row-store)
    // column for the caller to feed into its writer.
    Status transform_block(Block* block, int32_t segment_id,
                           segment_v2::DerivedColumn* derived_column);

    // Return the file size flushed to disk in "flush_size"
    // This method is thread-safe.
    Status flush_single_block(const Block* block, int32_t segment_id,
                              int64_t* flush_size = nullptr);

    int64_t num_rows_written() const { return _num_rows_written; }

    // for partial update
    int64_t num_rows_updated() const { return _num_rows_updated; }
    int64_t num_rows_deleted() const { return _num_rows_deleted; }
    int64_t num_rows_new_added() const { return _num_rows_new_added; }
    int64_t num_rows_filtered() const { return _num_rows_filtered; }

    Status close();

public:
    class Writer {
        friend class SegmentFlusher;

    public:
        ~Writer();

        Status add_rows(const Block* block, size_t row_offset, size_t input_row_num) {
            RETURN_IF_ERROR(_flusher->_add_rows(_writer, block, row_offset, input_row_num));
            _flusher->_num_rows_written += input_row_num;
            return Status::OK();
        }

        Status flush();

        int64_t max_row_to_add(size_t row_avg_size_in_bytes);

    private:
        Writer(SegmentFlusher* flusher, std::unique_ptr<segment_v2::SegmentWriter>& segment_writer);

        SegmentFlusher* _flusher = nullptr;
        std::unique_ptr<segment_v2::SegmentWriter> _writer;
    };

    Status create_writer(std::unique_ptr<SegmentFlusher::Writer>& writer, uint32_t segment_id);

private:
    Status _add_rows(std::unique_ptr<segment_v2::SegmentWriter>& segment_writer, const Block* block,
                     size_t row_offset, size_t row_num);
    Status _add_rows(std::unique_ptr<segment_v2::VerticalSegmentWriter>& segment_writer,
                     const Block* block, size_t row_offset, size_t row_num);
    Status _create_segment_writer(std::unique_ptr<segment_v2::SegmentWriter>& writer,
                                  int32_t segment_id, bool no_compression = false);
    Status _create_segment_writer(std::unique_ptr<segment_v2::VerticalSegmentWriter>& writer,
                                  int32_t segment_id, bool no_compression = false);
    Status _flush_segment_writer(std::unique_ptr<segment_v2::SegmentWriter>& writer,
                                 int64_t* flush_size = nullptr);
    Status _flush_segment_writer(std::unique_ptr<segment_v2::VerticalSegmentWriter>& writer,
                                 int64_t* flush_size = nullptr);
    void _record_segment_index_file_cache_preload(
            uint32_t segment_id, const segment_v2::SegmentIndexFileCacheInfo& info);
    Status _preload_segment_indexes_to_file_cache();

private:
    RowsetWriterContext& _context;
    SegmentFileCollection& _seg_files;
    InvertedIndexFileCollection& _idx_files;

    // written rows by add_block/add_row
    std::atomic<int64_t> _num_rows_written = 0;
    std::atomic<int64_t> _num_rows_updated = 0;
    std::atomic<int64_t> _num_rows_new_added = 0;
    std::atomic<int64_t> _num_rows_deleted = 0;
    std::atomic<int64_t> _num_rows_filtered = 0;
    std::mutex _segment_index_file_cache_preloads_lock;
    std::vector<segment_v2::SegmentIndexFileCachePreloadTask> _segment_index_file_cache_preloads;
};

class SegmentCreator {
public:
    SegmentCreator(RowsetWriterContext& context, SegmentFileCollection& seg_files,
                   InvertedIndexFileCollection& idx_files);

    ~SegmentCreator() = default;

    void set_segment_start_id(uint32_t start_id) { _next_segment_id = start_id; }

    Status add_block(const Block* block);

    Status flush();

    int32_t allocate_segment_id() { return _next_segment_id.fetch_add(1); }

    // Return the next segment id to be allocated without advancing internal state.
    int32_t get_allocated_segment_id() const { return _next_segment_id.load(); }

    int32_t next_segment_id() const { return _next_segment_id.load(); }

    int64_t num_rows_written() const { return _segment_flusher.num_rows_written(); }

    // for partial update
    int64_t num_rows_updated() const { return _segment_flusher.num_rows_updated(); }
    int64_t num_rows_deleted() const { return _segment_flusher.num_rows_deleted(); }
    int64_t num_rows_new_added() const { return _segment_flusher.num_rows_new_added(); }
    int64_t num_rows_filtered() const { return _segment_flusher.num_rows_filtered(); }

    // Flush a block into a single segment, with pre-allocated segment_id.
    // Return the file size flushed to disk in "flush_size"
    // This method is thread-safe.
    Status flush_single_block(const Block* block, int32_t segment_id,
                              int64_t* flush_size = nullptr);

    // Flush a block into a single segment, without pre-allocated segment_id.
    // This method is thread-safe.
    Status flush_single_block(const Block* block) {
        return flush_single_block(block, allocate_segment_id());
    }

    Status close();

private:
    std::atomic<int32_t> _next_segment_id = 0;
    SegmentFlusher _segment_flusher;
    std::unique_ptr<SegmentFlusher::Writer> _flush_writer;
};

} // namespace doris

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Created: 2026-08-18 18:21