// 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 {}, tablets num: {} timeout(s): {}",

                             _key.to_string(), 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: ";

    // every change will hold _lock. this find in under _lock too. so no need _tablet_writers_lock again.

    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;

        wrequest.txn_expiration = params.txn_expiration(); // Required by CLOUD.

        wrequest.storage_vault_id = params.storage_vault_id();

        auto delta_writer = create_delta_writer(wrequest);

        {

            // here we modify _tablet_writers. so need lock.

            std::lock_guard<SpinLock> l(_tablet_writers_lock);

            _tablet_writers.emplace(tablet.tablet_id(), std::move(delta_writer));

        }

        ss << "[" << tablet.tablet_id() << "]";

    }

    _s_tablet_writer_count += incremental_tablet_num;

    LOG(INFO) << ss.str();

    _state = kOpened;

    return Status::OK();

}

std::unique_ptr<BaseDeltaWriter> TabletsChannel::create_delta_writer(const WriteRequest& request) {

    return std::make_unique<DeltaWriter>(_engine, request, _profile, _load_id);

}

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;

    }

    for (auto pid : partition_ids) {

        _partition_ids.emplace(pid);

    }

    _closed_senders.Set(sender_id, true);

    _num_remaining_senders--;

    *finished = (_num_remaining_senders == 0);

    LOG(INFO) << fmt::format(

            "txn {}: close tablets channel of index {} , sender id: {}, backend {}, remain "

            "senders: {}",

            _txn_id, _index_id, sender_id, backend_id, _num_remaining_senders);

    if (!*finished) {

        return Status::OK();

    }

    _state = kFinished;

    // All senders are closed

    // 1. close all delta writers

    std::set<DeltaWriter*> need_wait_writers;

    // under _lock. no need _tablet_writers_lock again.

    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) {

        // 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) {

    PSlaveTabletNodes slave_nodes;

    if (_write_single_replica) {

        auto& nodes_map = req.slave_tablet_nodes();

        auto it = nodes_map.find(writer->tablet_id());

        if (it != nodes_map.end()) {

            slave_nodes = it->second;

        }

    }

    Status st = writer->commit_txn(slave_nodes);

    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_FINISHED);

            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;

    // under _lock. no need _tablet_writers_lock again.

    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,

                .txn_expiration = request.txn_expiration(), // Required by CLOUD.

                .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(),

                .storage_vault_id = request.storage_vault_id(),

        };

        auto delta_writer = create_delta_writer(wrequest);

        {

            std::lock_guard<SpinLock> l(_tablet_writers_lock);

            _tablet_writers.emplace(tablet.tablet_id(), std::move(delta_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::_write_block_data(

        const PTabletWriterAddBlockRequest& request, int64_t cur_seq,

        std::unordered_map<int64_t, DorisVector<uint32_t>>& tablet_to_rowidxs,

        PTabletWriterAddBlockResult* response) {

    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();

        // add_batch may concurrency with inc_open but not under _lock.

        // so need to protect it with _tablet_writers_lock.

        decltype(_tablet_writers.find(tablet_id)) tablet_writer_it;

        {

            std::lock_guard<SpinLock> l(_tablet_writers_lock);

            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();

}

Status TabletsChannel::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 */, DorisVector<uint32_t> /* row index */>

            tablet_to_rowidxs;

    _build_tablet_to_rowidxs(request, &tablet_to_rowidxs);

    return _write_block_data(request, cur_seq, tablet_to_rowidxs, response);

}

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, DorisVector<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);

    if (request.is_single_tablet_block()) {

        // The cloud mode need the tablet ids to prepare rowsets.

        int64_t tablet_id = request.tablet_ids(0);

        tablet_to_rowidxs->emplace(tablet_id, std::initializer_list<uint32_t> {0});

        return;

    }

    for (uint32_t i = 0; i < request.tablet_ids_size(); ++i) {

        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