// 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.

#include "olap/full_compaction.h"

#include <glog/logging.h>

#include <time.h>

#include <memory>

#include <mutex>

#include <ostream>

#include <shared_mutex>

#include "common/config.h"

#include "common/status.h"

#include "olap/cumulative_compaction_policy.h"

#include "olap/olap_common.h"

#include "olap/olap_define.h"

#include "olap/rowset/beta_rowset.h"

#include "olap/rowset/rowset.h"

#include "olap/schema_change.h"

#include "olap/tablet_meta.h"

#include "runtime/thread_context.h"

#include "util/thread.h"

#include "util/trace.h"

namespace doris {

using namespace ErrorCode;

FullCompaction::FullCompaction(const TabletSharedPtr& tablet)

        : Compaction(tablet, "FullCompaction:" + std::to_string(tablet->tablet_id())) {}

FullCompaction::~FullCompaction() {

    _tablet->set_is_full_compaction_running(false);

}

Status FullCompaction::prepare_compact() {

    if (!_tablet->init_succeeded()) {

        return Status::Error<INVALID_ARGUMENT, false>("Full compaction init failed");

    }

    std::unique_lock base_lock(_tablet->get_base_compaction_lock());

    std::unique_lock cumu_lock(_tablet->get_cumulative_compaction_lock());

    _tablet->set_is_full_compaction_running(true);

    // 1. pick rowsets to compact

    RETURN_IF_ERROR(pick_rowsets_to_compact());

    return Status::OK();

}

Status FullCompaction::execute_compact_impl() {

    std::unique_lock base_lock(_tablet->get_base_compaction_lock());

    std::unique_lock cumu_lock(_tablet->get_cumulative_compaction_lock());

    SCOPED_ATTACH_TASK(_mem_tracker);

    // 2. do full compaction, merge rowsets

    int64_t permits = get_compaction_permits();

    RETURN_IF_ERROR(do_compaction(permits));

    // 3. set state to success

    _state = CompactionState::SUCCESS;

    // 4. set cumulative level

    _tablet->cumulative_compaction_policy()->update_compaction_level(_tablet.get(), _input_rowsets,

                                                                     _output_rowset);

    // 5. set cumulative point

    Version last_version = _input_rowsets.back()->version();

    _tablet->cumulative_compaction_policy()->update_cumulative_point(_tablet.get(), _input_rowsets,

                                                                     _output_rowset, last_version);

    VLOG_CRITICAL << "after cumulative compaction, current cumulative point is "

                  << _tablet->cumulative_layer_point() << ", tablet=" << _tablet->full_name();

    return Status::OK();

}

Status FullCompaction::pick_rowsets_to_compact() {

    _input_rowsets = _tablet->pick_candidate_rowsets_to_full_compaction();

    RETURN_IF_ERROR(check_version_continuity(_input_rowsets));

    RETURN_IF_ERROR(_check_all_version(_input_rowsets));

    if (_input_rowsets.size() <= 1) {

        return Status::Error<FULL_NO_SUITABLE_VERSION>("There is no suitable version");

    }

    if (_input_rowsets.size() == 2 && _input_rowsets[0]->end_version() == 1) {

        // the tablet is with rowset: [0-1], [2-y]

        // and [0-1] has no data. in this situation, no need to do full compaction.

        return Status::Error<FULL_NO_SUITABLE_VERSION>("There is no suitable version");

    }

    return Status::OK();

}

Status FullCompaction::modify_rowsets(const Merger::Statistics* stats) {

    if (_tablet->keys_type() == KeysType::UNIQUE_KEYS &&

        _tablet->enable_unique_key_merge_on_write()) {

        RETURN_IF_ERROR(

                _full_compaction_update_delete_bitmap(_output_rowset, _output_rs_writer.get()));

    }

    std::vector<RowsetSharedPtr> output_rowsets(1, _output_rowset);

    {

        std::lock_guard<std::mutex> rowset_update_wlock(_tablet->get_rowset_update_lock());

        std::lock_guard<std::shared_mutex> meta_wlock(_tablet->get_header_lock());

        RETURN_IF_ERROR(_tablet->modify_rowsets(output_rowsets, _input_rowsets, true));

        DBUG_EXECUTE_IF("FullCompaction.modify_rowsets.sleep", { sleep(5); })

        _tablet->save_meta();

    }

    return Status::OK();

}

Status FullCompaction::_check_all_version(const std::vector<RowsetSharedPtr>& rowsets) {

    if (rowsets.empty()) {

        return Status::Error<FULL_MISS_VERSION, false>(

                "There is no input rowset when do full compaction");

    }

    const RowsetSharedPtr& last_rowset = rowsets.back();

    const RowsetSharedPtr& first_rowset = rowsets.front();

    if (last_rowset->version() != _tablet->max_version() || first_rowset->version().first != 0) {

        return Status::Error<FULL_MISS_VERSION, false>(

                "Full compaction rowsets' versions not equal to all exist rowsets' versions. "

                "full compaction rowsets max version={}-{}"

                ", current rowsets max version={}-{}"

                "full compaction rowsets min version={}-{}, current rowsets min version=0-1",

                last_rowset->start_version(), last_rowset->end_version(),

                _tablet->max_version().first, _tablet->max_version().second,

                first_rowset->start_version(), first_rowset->end_version());

    }

    return Status::OK();

}

Status FullCompaction::_full_compaction_update_delete_bitmap(const RowsetSharedPtr& rowset,

                                                             RowsetWriter* rowset_writer) {

    std::vector<RowsetSharedPtr> tmp_rowsets {};

    // tablet is under alter process. The delete bitmap will be calculated after conversion.

    if (_tablet->tablet_state() == TABLET_NOTREADY) {

        LOG(INFO) << "tablet is under alter process, update delete bitmap later, tablet_id="

                  << _tablet->tablet_id();

        return Status::OK();

    }

    int64_t max_version = _tablet->max_version().second;

    DCHECK(max_version >= rowset->version().second);

    if (max_version > rowset->version().second) {

        _tablet->capture_consistent_rowsets({rowset->version().second + 1, max_version},

                                            &tmp_rowsets);

    }

    for (const auto& it : tmp_rowsets) {

        const int64_t& cur_version = it->rowset_meta()->start_version();

        RETURN_IF_ERROR(

                _full_compaction_calc_delete_bitmap(it, rowset, cur_version, rowset_writer));

    }

    std::lock_guard rowset_update_lock(_tablet->get_rowset_update_lock());

    std::lock_guard header_lock(_tablet->get_header_lock());

    SCOPED_SIMPLE_TRACE_IF_TIMEOUT(TRACE_TABLET_LOCK_THRESHOLD);

    for (const auto& it : _tablet->rowset_map()) {

        const int64_t& cur_version = it.first.first;

        const RowsetSharedPtr& published_rowset = it.second;

        if (cur_version > max_version) {

            RETURN_IF_ERROR(_full_compaction_calc_delete_bitmap(published_rowset, rowset,

                                                                cur_version, rowset_writer));

        }

    }

    return Status::OK();

}

Status FullCompaction::_full_compaction_calc_delete_bitmap(const RowsetSharedPtr& published_rowset,

                                                           const RowsetSharedPtr& rowset,

                                                           const int64_t& cur_version,

                                                           RowsetWriter* rowset_writer) {

    std::vector<segment_v2::SegmentSharedPtr> segments;

    auto beta_rowset = reinterpret_cast<BetaRowset*>(published_rowset.get());

    RETURN_IF_ERROR(beta_rowset->load_segments(&segments));

    DeleteBitmapPtr delete_bitmap =

            std::make_shared<DeleteBitmap>(_tablet->tablet_meta()->tablet_id());

    std::vector<RowsetSharedPtr> specified_rowsets(1, rowset);

    OlapStopWatch watch;

    RETURN_IF_ERROR(_tablet->calc_delete_bitmap(published_rowset, segments, specified_rowsets,

                                                delete_bitmap, cur_version, nullptr,

                                                rowset_writer));

    size_t total_rows = std::accumulate(

            segments.begin(), segments.end(), 0,

            [](size_t sum, const segment_v2::SegmentSharedPtr& s) { return sum += s->num_rows(); });

    VLOG_DEBUG << "[Full compaction] construct delete bitmap tablet: " << _tablet->tablet_id()

               << ", published rowset version: [" << published_rowset->version().first << "-"

               << published_rowset->version().second << "]"

               << ", full compaction rowset version: [" << rowset->version().first << "-"

               << rowset->version().second << "]"

               << ", cost: " << watch.get_elapse_time_us() << "(us), total rows: " << total_rows;

    for (const auto& [k, v] : delete_bitmap->delete_bitmap) {

        _tablet->tablet_meta()->delete_bitmap().merge({std::get<0>(k), std::get<1>(k), cur_version},

                                                      v);

    }

    return Status::OK();

}

} // namespace doris