// 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 "runtime/tablets_channel.h"

#include <bvar/bvar.h>
#include <fmt/format.h>
#include <gen_cpp/internal_service.pb.h>
#include <gen_cpp/types.pb.h>

#include <ctime>

#include "common/compiler_util.h" // IWYU pragma: keep
#include "common/status.h"
// IWYU pragma: no_include <bits/chrono.h>
#include <chrono> // IWYU pragma: keep
#include <initializer_list>
#include <set>
#include <thread>
#include <utility>

#ifdef DEBUG
#include <unordered_set>
#endif

#include "common/logging.h"
#include "exec/tablet_info.h"
#include "olap/delta_writer.h"
#include "olap/storage_engine.h"
#include "olap/txn_manager.h"
#include "runtime/load_channel.h"
#include "util/defer_op.h"
#include "util/doris_metrics.h"
#include "util/metrics.h"
#include "vec/core/block.h"

namespace doris {
class SlotDescriptor;

bvar::Adder<int64_t> g_tablets_channel_send_data_allocated_size(
        "tablets_channel_send_data_allocated_size");

DEFINE_GAUGE_METRIC_PROTOTYPE_2ARG(tablet_writer_count, MetricUnit::NOUNIT);

std::atomic<uint64_t> BaseTabletsChannel::_s_tablet_writer_count;

BaseTabletsChannel::BaseTabletsChannel(const TabletsChannelKey& key, const UniqueId& load_id,
                                       bool is_high_priority, RuntimeProfile* profile)
        : _key(key),
          _state(kInitialized),
          _load_id(load_id),
          _closed_senders(64),
          _is_high_priority(is_high_priority) {
    static std::once_flag once_flag;
    _init_profile(profile);
    std::call_once(once_flag, [] {
        REGISTER_HOOK_METRIC(tablet_writer_count, [&]() { return _s_tablet_writer_count.load(); });
    });
}

TabletsChannel::TabletsChannel(StorageEngine& engine, const TabletsChannelKey& key,
                               const UniqueId& load_id, bool is_high_priority,
                               RuntimeProfile* profile)
        : BaseTabletsChannel(key, load_id, is_high_priority, profile), _engine(engine) {}

BaseTabletsChannel::~BaseTabletsChannel() {
    _s_tablet_writer_count -= _tablet_writers.size();
}

TabletsChannel::~TabletsChannel() = default;

Status BaseTabletsChannel::_get_current_seq(int64_t& cur_seq,
                                            const PTabletWriterAddBlockRequest& request) {
    std::lock_guard<std::mutex> l(_lock);
    if (_state != kOpened) {
        return _state == kFinished ? _close_status
                                   : Status::InternalError("TabletsChannel {} state: {}",
                                                           _key.to_string(), _state);
    }
    cur_seq = _next_seqs[request.sender_id()];
    // check packet
    if (request.packet_seq() > cur_seq) {
        LOG(WARNING) << "lost data packet, expect_seq=" << cur_seq
                     << ", recept_seq=" << request.packet_seq();
        return Status::InternalError("lost data packet");
    }
    return Status::OK();
}

void BaseTabletsChannel::_init_profile(RuntimeProfile* profile) {
    _profile =
            profile->create_child(fmt::format("TabletsChannel {}", _key.to_string()), true, true);
    _add_batch_number_counter = ADD_COUNTER(_profile, "NumberBatchAdded", TUnit::UNIT);

    auto* memory_usage = _profile->create_child("PeakMemoryUsage", true, true);
    _add_batch_timer = ADD_TIMER(_profile, "AddBatchTime");
    _write_block_timer = ADD_TIMER(_profile, "WriteBlockTime");
    _incremental_open_timer = ADD_TIMER(_profile, "IncrementalOpenTabletTime");
    _memory_usage_counter = memory_usage->AddHighWaterMarkCounter("Total", TUnit::BYTES);
    _write_memory_usage_counter = memory_usage->AddHighWaterMarkCounter("Write", TUnit::BYTES);
    _flush_memory_usage_counter = memory_usage->AddHighWaterMarkCounter("Flush", TUnit::BYTES);
    _max_tablet_memory_usage_counter =
            memory_usage->AddHighWaterMarkCounter("MaxTablet", TUnit::BYTES);
    _max_tablet_write_memory_usage_counter =
            memory_usage->AddHighWaterMarkCounter("MaxTabletWrite", TUnit::BYTES);
    _max_tablet_flush_memory_usage_counter =
            memory_usage->AddHighWaterMarkCounter("MaxTabletFlush", TUnit::BYTES);
}

void TabletsChannel::_init_profile(RuntimeProfile* profile) {
    BaseTabletsChannel::_init_profile(profile);
    _slave_replica_timer = ADD_TIMER(_profile, "SlaveReplicaTime");
}

Status BaseTabletsChannel::open(const PTabletWriterOpenRequest& request) {
    std::lock_guard<std::mutex> l(_lock);
    // if _state is kOpened, it's a normal case, already open by other sender
    // if _state is kFinished, already cancelled by other sender
    if (_state == kOpened || _state == kFinished) {
        return Status::OK();
    }
    LOG(INFO) << fmt::format("open tablets channel of index {}, tablets num: {} timeout(s): {}",
                             _index_id, request.tablets().size(), request.load_channel_timeout_s());
    _txn_id = request.txn_id();
    _index_id = request.index_id();
    _schema = std::make_shared<OlapTableSchemaParam>();
    RETURN_IF_ERROR(_schema->init(request.schema()));
    _tuple_desc = _schema->tuple_desc();

    int max_sender = request.num_senders();
    /*
     * a tablets channel in reciever is related to a bulk of VNodeChannel of sender. each instance one or none.
     * there are two possibilities:
     *  1. there's partitions originally broadcasted by FE. so all sender(instance) know it at start. and open() will be 
     *     called directly, not by incremental_open(). and after _state changes to kOpened. _open_by_incremental will never 
     *     be true. in this case, _num_remaining_senders will keep same with senders number. when all sender sent close rpc,
     *     the tablets channel will close. and if for auto partition table, these channel's closing will hang on reciever and
     *     return together to avoid close-then-incremental-open problem.
     *  2. this tablets channel is opened by incremental_open of sender's sink node. so only this sender will know this partition
     *     (this TabletsChannel) at that time. and we are not sure how many sender will know in the end. it depends on data
     *     distribution. in this situation open() is called by incremental_open() at first time. so _open_by_incremental is true.
     *     then _num_remaining_senders will not be set here. but inc every time when incremental_open() called. so it's dynamic
     *     and also need same number of senders' close to close. but will not hang.
     */
    if (_open_by_incremental) {
        DCHECK(_num_remaining_senders == 0) << _num_remaining_senders;
    } else {
        _num_remaining_senders = max_sender;
    }
    LOG(INFO) << fmt::format(
            "txn {}: TabletsChannel of index {} init senders {} with incremental {}", _txn_id,
            _index_id, _num_remaining_senders, _open_by_incremental ? "on" : "off");
    // just use max_sender no matter incremental or not cuz we dont know how many senders will open.
    _next_seqs.resize(max_sender, 0);
    _closed_senders.Reset(max_sender);

    RETURN_IF_ERROR(_open_all_writers(request));

    _state = kOpened;
    return Status::OK();
}

Status BaseTabletsChannel::incremental_open(const PTabletWriterOpenRequest& params) {
    SCOPED_TIMER(_incremental_open_timer);

    // current node first opened by incremental open
    if (_state == kInitialized) {
        _open_by_incremental = true;
        RETURN_IF_ERROR(open(params));
    }

    std::lock_guard<std::mutex> l(_lock);

    // one sender may incremental_open many times. but only close one time. so dont count duplicately.
    if (_open_by_incremental) {
        if (params.has_sender_id() && !_recieved_senders.contains(params.sender_id())) {
            _recieved_senders.insert(params.sender_id());
            _num_remaining_senders++;
        } else if (!params.has_sender_id()) { // for compatible
            _num_remaining_senders++;
        }
        VLOG_DEBUG << fmt::format("txn {}: TabletsChannel {} inc senders to {}", _txn_id, _index_id,
                                  _num_remaining_senders);
    }

    std::vector<SlotDescriptor*>* index_slots = nullptr;
    int32_t schema_hash = 0;
    for (const auto& index : _schema->indexes()) {
        if (index->index_id == _index_id) {
            index_slots = &index->slots;
            schema_hash = index->schema_hash;
            break;
        }
    }
    if (index_slots == nullptr) {
        return Status::InternalError("unknown index id, key={}", _key.to_string());
    }
    // update tablets
    size_t incremental_tablet_num = 0;
    std::stringstream ss;
    ss << "LocalTabletsChannel txn_id: " << _txn_id << " load_id: " << print_id(params.id())
       << " incremental open delta writer: ";

    for (const auto& tablet : params.tablets()) {
        if (_tablet_writers.find(tablet.tablet_id()) != _tablet_writers.end()) {
            continue;
        }
        incremental_tablet_num++;

        WriteRequest wrequest;
        wrequest.index_id = params.index_id();
        wrequest.tablet_id = tablet.tablet_id();
        wrequest.schema_hash = schema_hash;
        wrequest.txn_id = _txn_id;
        wrequest.partition_id = tablet.partition_id();
        wrequest.load_id = params.id();
        wrequest.tuple_desc = _tuple_desc;
        wrequest.slots = index_slots;
        wrequest.is_high_priority = _is_high_priority;
        wrequest.table_schema_param = _schema;

        // TODO(plat1ko): CloudDeltaWriter
        auto delta_writer = std::make_unique<DeltaWriter>(*StorageEngine::instance(), &wrequest,
                                                          _profile, _load_id);
        ss << "[" << tablet.tablet_id() << "]";
        {
            std::lock_guard<SpinLock> l(_tablet_writers_lock);
            _tablet_writers.emplace(tablet.tablet_id(), std::move(delta_writer));
        }
    }

    _s_tablet_writer_count += incremental_tablet_num;
    LOG(INFO) << ss.str();

    _state = kOpened;
    return Status::OK();
}

Status TabletsChannel::close(LoadChannel* parent, const PTabletWriterAddBlockRequest& req,
                             PTabletWriterAddBlockResult* res, bool* finished) {
    int sender_id = req.sender_id();
    int64_t backend_id = req.backend_id();
    const auto& partition_ids = req.partition_ids();
    auto* tablet_errors = res->mutable_tablet_errors();
    std::lock_guard<std::mutex> l(_lock);
    if (_state == kFinished) {
        return _close_status;
    }
    if (_closed_senders.Get(sender_id)) {
        // Double close from one sender, just return OK
        *finished = (_num_remaining_senders == 0);
        return _close_status;
    }
    LOG(INFO) << "close tablets channel: " << _key << ", sender id: " << sender_id
              << ", backend id: " << backend_id;
    for (auto pid : partition_ids) {
        _partition_ids.emplace(pid);
    }
    _closed_senders.Set(sender_id, true);
    _num_remaining_senders--;
    *finished = (_num_remaining_senders == 0);
    if (*finished) {
        _state = kFinished;
        // All senders are closed
        // 1. close all delta writers
        std::set<DeltaWriter*> need_wait_writers;
        for (auto&& [tablet_id, writer] : _tablet_writers) {
            if (_partition_ids.contains(writer->partition_id())) {
                auto st = writer->close();
                if (!st.ok()) {
                    auto err_msg = fmt::format(
                            "close tablet writer failed, tablet_id={}, "
                            "transaction_id={}, err={}",
                            tablet_id, _txn_id, st.to_string());
                    LOG(WARNING) << err_msg;
                    PTabletError* tablet_error = tablet_errors->Add();
                    tablet_error->set_tablet_id(tablet_id);
                    tablet_error->set_msg(st.to_string());
                    // just skip this tablet(writer) and continue to close others
                    continue;
                }
                // tablet writer in `_broken_tablets` should not call `build_rowset` and
                // `commit_txn` method, after that, the publish-version task will success,
                // which can cause the replica inconsistency.
                if (_is_broken_tablet(writer->tablet_id())) {
                    LOG(WARNING) << "SHOULD NOT HAPPEN, tablet writer is broken but not cancelled"
                                 << ", tablet_id=" << tablet_id << ", transaction_id=" << _txn_id;
                    continue;
                }
                need_wait_writers.insert(static_cast<DeltaWriter*>(writer.get()));
            } else {
                auto st = writer->cancel();
                if (!st.ok()) {
                    LOG(WARNING) << "cancel tablet writer failed, tablet_id=" << tablet_id
                                 << ", transaction_id=" << _txn_id;
                    // just skip this tablet(writer) and continue to close others
                    continue;
                }
                VLOG_PROGRESS << "cancel tablet writer successfully, tablet_id=" << tablet_id
                              << ", transaction_id=" << _txn_id;
            }
        }

        _write_single_replica = req.write_single_replica();

        // 2. wait all writer finished flush.
        for (auto* writer : need_wait_writers) {
            RETURN_IF_ERROR((writer->wait_flush()));
        }

        // 3. build rowset
        for (auto it = need_wait_writers.begin(); it != need_wait_writers.end();) {
            Status st = (*it)->build_rowset();
            if (!st.ok()) {
                _add_error_tablet(tablet_errors, (*it)->tablet_id(), st);
                it = need_wait_writers.erase(it);
                continue;
            }
            // 3.1 calculate delete bitmap for Unique Key MoW tables
            st = (*it)->submit_calc_delete_bitmap_task();
            if (!st.ok()) {
                _add_error_tablet(tablet_errors, (*it)->tablet_id(), st);
                it = need_wait_writers.erase(it);
                continue;
            }
            it++;
        }

        // 4. wait for delete bitmap calculation complete if necessary
        for (auto it = need_wait_writers.begin(); it != need_wait_writers.end();) {
            Status st = (*it)->wait_calc_delete_bitmap();
            if (!st.ok()) {
                _add_error_tablet(tablet_errors, (*it)->tablet_id(), st);
                it = need_wait_writers.erase(it);
                continue;
            }
            it++;
        }

        // 5. commit all writers

        for (auto* writer : need_wait_writers) {
            PSlaveTabletNodes slave_nodes;

            // close may return failed, but no need to handle it here.
            // tablet_vec will only contains success tablet, and then let FE judge it.
            _commit_txn(writer, req, res);
        }

        if (_write_single_replica) {
            auto* success_slave_tablet_node_ids = res->mutable_success_slave_tablet_node_ids();
            // The operation waiting for all slave replicas to complete must end before the timeout,
            // so that there is enough time to collect completed replica. Otherwise, the task may
            // timeout and fail even though most of the replicas are completed. Here we set 0.9
            // times the timeout as the maximum waiting time.
            SCOPED_TIMER(_slave_replica_timer);
            while (!need_wait_writers.empty() &&
                   (time(nullptr) - parent->last_updated_time()) < (parent->timeout() * 0.9)) {
                std::set<DeltaWriter*>::iterator it;
                for (it = need_wait_writers.begin(); it != need_wait_writers.end();) {
                    bool is_done = (*it)->check_slave_replicas_done(success_slave_tablet_node_ids);
                    if (is_done) {
                        need_wait_writers.erase(it++);
                    } else {
                        it++;
                    }
                }
                std::this_thread::sleep_for(std::chrono::milliseconds(100));
            }
            for (auto* writer : need_wait_writers) {
                writer->add_finished_slave_replicas(success_slave_tablet_node_ids);
            }
            _engine.txn_manager()->clear_txn_tablet_delta_writer(_txn_id);
        }
    }
    return Status::OK();
}

void TabletsChannel::_commit_txn(DeltaWriter* writer, const PTabletWriterAddBlockRequest& req,
                                 PTabletWriterAddBlockResult* res) {
    Status st = writer->commit_txn(_write_single_replica
                                           ? req.slave_tablet_nodes().at(writer->tablet_id())
                                           : PSlaveTabletNodes {});
    if (st.ok()) [[likely]] {
        auto* tablet_vec = res->mutable_tablet_vec();
        PTabletInfo* tablet_info = tablet_vec->Add();
        tablet_info->set_tablet_id(writer->tablet_id());
        // unused required field.
        tablet_info->set_schema_hash(0);
        tablet_info->set_received_rows(writer->total_received_rows());
        tablet_info->set_num_rows_filtered(writer->num_rows_filtered());
        _total_received_rows += writer->total_received_rows();
        _num_rows_filtered += writer->num_rows_filtered();
    } else {
        _add_error_tablet(res->mutable_tablet_errors(), writer->tablet_id(), st);
    }
}

void BaseTabletsChannel::_add_error_tablet(
        google::protobuf::RepeatedPtrField<PTabletError>* tablet_errors, int64_t tablet_id,
        Status error) const {
    PTabletError* tablet_error = tablet_errors->Add();
    tablet_error->set_tablet_id(tablet_id);
    tablet_error->set_msg(error.to_string());
    VLOG_PROGRESS << "close wait failed tablet " << tablet_id << " transaction_id " << _txn_id
                  << "err msg " << error;
}

void BaseTabletsChannel::refresh_profile() {
    int64_t write_mem_usage = 0;
    int64_t flush_mem_usage = 0;
    int64_t max_tablet_mem_usage = 0;
    int64_t max_tablet_write_mem_usage = 0;
    int64_t max_tablet_flush_mem_usage = 0;
    {
        std::lock_guard<SpinLock> l(_tablet_writers_lock);
        for (auto&& [tablet_id, writer] : _tablet_writers) {
            int64_t write_mem = writer->mem_consumption(MemType::WRITE);
            write_mem_usage += write_mem;
            int64_t flush_mem = writer->mem_consumption(MemType::FLUSH);
            flush_mem_usage += flush_mem;
            if (write_mem > max_tablet_write_mem_usage) {
                max_tablet_write_mem_usage = write_mem;
            }
            if (flush_mem > max_tablet_flush_mem_usage) {
                max_tablet_flush_mem_usage = flush_mem;
            }
            if (write_mem + flush_mem > max_tablet_mem_usage) {
                max_tablet_mem_usage = write_mem + flush_mem;
            }
        }
    }
    COUNTER_SET(_memory_usage_counter, write_mem_usage + flush_mem_usage);
    COUNTER_SET(_write_memory_usage_counter, write_mem_usage);
    COUNTER_SET(_flush_memory_usage_counter, flush_mem_usage);
    COUNTER_SET(_max_tablet_memory_usage_counter, max_tablet_mem_usage);
    COUNTER_SET(_max_tablet_write_memory_usage_counter, max_tablet_write_mem_usage);
    COUNTER_SET(_max_tablet_flush_memory_usage_counter, max_tablet_flush_mem_usage);
}

Status BaseTabletsChannel::_open_all_writers(const PTabletWriterOpenRequest& request) {
    std::vector<SlotDescriptor*>* index_slots = nullptr;
    int32_t schema_hash = 0;
    for (const auto& index : _schema->indexes()) {
        if (index->index_id == _index_id) {
            index_slots = &index->slots;
            schema_hash = index->schema_hash;
            break;
        }
    }
    if (index_slots == nullptr) {
        return Status::InternalError("unknown index id, key={}", _key.to_string());
    }

#ifdef DEBUG
    // check: tablet ids should be unique
    {
        std::unordered_set<int64_t> tablet_ids;
        for (const auto& tablet : request.tablets()) {
            CHECK(tablet_ids.count(tablet.tablet_id()) == 0)
                    << "found duplicate tablet id: " << tablet.tablet_id();
            tablet_ids.insert(tablet.tablet_id());
        }
    }
#endif

    int tablet_cnt = 0;
    for (const auto& tablet : request.tablets()) {
        if (_tablet_writers.find(tablet.tablet_id()) != _tablet_writers.end()) {
            continue;
        }
        tablet_cnt++;
        WriteRequest wrequest {
                .tablet_id = tablet.tablet_id(),
                .schema_hash = schema_hash,
                .txn_id = _txn_id,
                .index_id = request.index_id(),
                .partition_id = tablet.partition_id(),
                .load_id = request.id(),
                .tuple_desc = _tuple_desc,
                .slots = index_slots,
                .table_schema_param = _schema,
                .is_high_priority = _is_high_priority,
                .write_file_cache = request.write_file_cache(),
        };

        // TODO(plat1ko): CloudDeltaWriter
        auto writer = std::make_unique<DeltaWriter>(*StorageEngine::instance(), &wrequest, _profile,
                                                    _load_id);
        {
            std::lock_guard<SpinLock> l(_tablet_writers_lock);
            _tablet_writers.emplace(tablet.tablet_id(), std::move(writer));
        }
    }
    _s_tablet_writer_count += _tablet_writers.size();
    DCHECK_EQ(_tablet_writers.size(), tablet_cnt);
    return Status::OK();
}

Status BaseTabletsChannel::cancel() {
    std::lock_guard<std::mutex> l(_lock);
    if (_state == kFinished) {
        return _close_status;
    }
    for (auto& it : _tablet_writers) {
        static_cast<void>(it.second->cancel());
    }
    _state = kFinished;

    return Status::OK();
}

Status TabletsChannel::cancel() {
    RETURN_IF_ERROR(BaseTabletsChannel::cancel());
    if (_write_single_replica) {
        _engine.txn_manager()->clear_txn_tablet_delta_writer(_txn_id);
    }
    return Status::OK();
}

std::string TabletsChannelKey::to_string() const {
    std::stringstream ss;
    ss << *this;
    return ss.str();
}

std::ostream& operator<<(std::ostream& os, const TabletsChannelKey& key) {
    os << "(load_id=" << key.id << ", index_id=" << key.index_id << ")";
    return os;
}

Status BaseTabletsChannel::add_batch(const PTabletWriterAddBlockRequest& request,
                                     PTabletWriterAddBlockResult* response) {
    SCOPED_TIMER(_add_batch_timer);
    int64_t cur_seq = 0;
    _add_batch_number_counter->update(1);

    auto status = _get_current_seq(cur_seq, request);
    if (UNLIKELY(!status.ok())) {
        return status;
    }

    if (request.packet_seq() < cur_seq) {
        LOG(INFO) << "packet has already recept before, expect_seq=" << cur_seq
                  << ", recept_seq=" << request.packet_seq();
        return Status::OK();
    }

    std::unordered_map<int64_t /* tablet_id */, std::vector<uint32_t> /* row index */>
            tablet_to_rowidxs;
    _build_tablet_to_rowidxs(request, &tablet_to_rowidxs);

    vectorized::Block send_data;
    RETURN_IF_ERROR(send_data.deserialize(request.block()));
    CHECK(send_data.rows() == request.tablet_ids_size())
            << "block rows: " << send_data.rows()
            << ", tablet_ids_size: " << request.tablet_ids_size();

    g_tablets_channel_send_data_allocated_size << send_data.allocated_bytes();
    Defer defer {
            [&]() { g_tablets_channel_send_data_allocated_size << -send_data.allocated_bytes(); }};

    auto write_tablet_data = [&](int64_t tablet_id,
                                 std::function<Status(BaseDeltaWriter * writer)> write_func) {
        google::protobuf::RepeatedPtrField<PTabletError>* tablet_errors =
                response->mutable_tablet_errors();
        auto tablet_writer_it = _tablet_writers.find(tablet_id);
        if (tablet_writer_it == _tablet_writers.end()) {
            return Status::InternalError("unknown tablet to append data, tablet={}", tablet_id);
        }
        Status st = write_func(tablet_writer_it->second.get());
        if (!st.ok()) {
            auto err_msg =
                    fmt::format("tablet writer write failed, tablet_id={}, txn_id={}, err={}",
                                tablet_id, _txn_id, st.to_string());
            LOG(WARNING) << err_msg;
            PTabletError* error = tablet_errors->Add();
            error->set_tablet_id(tablet_id);
            error->set_msg(err_msg);
            static_cast<void>(tablet_writer_it->second->cancel_with_status(st));
            _add_broken_tablet(tablet_id);
            // continue write to other tablet.
            // the error will return back to sender.
        }
        return Status::OK();
    };

    SCOPED_TIMER(_write_block_timer);
    for (const auto& tablet_to_rowidxs_it : tablet_to_rowidxs) {
        RETURN_IF_ERROR(write_tablet_data(tablet_to_rowidxs_it.first, [&](BaseDeltaWriter* writer) {
            return writer->write(&send_data, tablet_to_rowidxs_it.second);
        }));
    }

    {
        std::lock_guard<std::mutex> l(_lock);
        _next_seqs[request.sender_id()] = cur_seq + 1;
    }
    return Status::OK();
}

void BaseTabletsChannel::_add_broken_tablet(int64_t tablet_id) {
    std::unique_lock<std::shared_mutex> wlock(_broken_tablets_lock);
    _broken_tablets.insert(tablet_id);
}

bool BaseTabletsChannel::_is_broken_tablet(int64_t tablet_id) const {
    return _broken_tablets.find(tablet_id) != _broken_tablets.end();
}

void BaseTabletsChannel::_build_tablet_to_rowidxs(
        const PTabletWriterAddBlockRequest& request,
        std::unordered_map<int64_t, std::vector<uint32_t>>* tablet_to_rowidxs) {
    // just add a coarse-grained read lock here rather than each time when visiting _broken_tablets
    // tests show that a relatively coarse-grained read lock here performs better under multicore scenario
    // see: https://github.com/apache/doris/pull/28552
    std::shared_lock<std::shared_mutex> rlock(_broken_tablets_lock);
    for (uint32_t i = 0; i < request.tablet_ids_size(); ++i) {
        if (request.is_single_tablet_block()) {
            break;
        }
        int64_t tablet_id = request.tablet_ids(i);
        if (_is_broken_tablet(tablet_id)) {
            // skip broken tablets
            VLOG_PROGRESS << "skip broken tablet tablet=" << tablet_id;
            continue;
        }
        auto it = tablet_to_rowidxs->find(tablet_id);
        if (it == tablet_to_rowidxs->end()) {
            tablet_to_rowidxs->emplace(tablet_id, std::initializer_list<uint32_t> {i});
        } else {
            it->second.emplace_back(i);
        }
    }
}

} // namespace doris