// 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/snapshot_manager.h"

#include <fmt/format.h>

#include <gen_cpp/AgentService_types.h>

#include <gen_cpp/Types_constants.h>

#include <gen_cpp/olap_file.pb.h>

#include <thrift/protocol/TDebugProtocol.h>

#include <algorithm>

#include <atomic>

#include <ctime>

#include <filesystem>

#include <list>

#include <map>

#include <new>

#include <ostream>

#include <set>

#include <shared_mutex>

#include <unordered_map>

#include <utility>

#include "common/config.h"

#include "common/logging.h"

#include "common/status.h"

#include "io/fs/local_file_system.h"

#include "olap/data_dir.h"

#include "olap/olap_common.h"

#include "olap/olap_define.h"

#include "olap/pb_helper.h"

#include "olap/rowset/rowset.h"

#include "olap/rowset/rowset_factory.h"

#include "olap/rowset/rowset_meta.h"

#include "olap/rowset/rowset_writer.h"

#include "olap/rowset/rowset_writer_context.h"

#include "olap/storage_engine.h"

#include "olap/tablet_manager.h"

#include "olap/tablet_meta.h"

#include "olap/tablet_schema.h"

#include "olap/tablet_schema_cache.h"

#include "olap/utils.h"

#include "runtime/memory/mem_tracker_limiter.h"

#include "runtime/thread_context.h"

#include "util/uid_util.h"

using std::nothrow;

using std::string;

using std::stringstream;

using std::vector;

namespace doris {

using namespace ErrorCode;

SnapshotManager::SnapshotManager(StorageEngine& engine) : _engine(engine) {

    _mem_tracker =

            MemTrackerLimiter::create_shared(MemTrackerLimiter::Type::OTHER, "SnapshotManager");

}

SnapshotManager::~SnapshotManager() = default;

Status SnapshotManager::make_snapshot(const TSnapshotRequest& request, string* snapshot_path,

                                      bool* allow_incremental_clone) {

    SCOPED_ATTACH_TASK(_mem_tracker);

    Status res = Status::OK();

    if (snapshot_path == nullptr) {

        return Status::Error<INVALID_ARGUMENT>("output parameter cannot be null");

    }

    TabletSharedPtr target_tablet = _engine.tablet_manager()->get_tablet(request.tablet_id);

    DBUG_EXECUTE_IF("SnapshotManager::make_snapshot.inject_failure", { target_tablet = nullptr; })

    if (target_tablet == nullptr) {

        return Status::Error<TABLE_NOT_FOUND>("failed to get tablet. tablet={}", request.tablet_id);

    }

    TabletSharedPtr ref_tablet = target_tablet;

    if (request.__isset.ref_tablet_id) {

        int64_t ref_tablet_id = request.ref_tablet_id;

        TabletSharedPtr base_tablet = _engine.tablet_manager()->get_tablet(ref_tablet_id);

        // Some tasks, like medium migration, cause the target tablet and base tablet to stay on

        // different disks. In this case, we fall through to the normal restore path.

        //

        // Otherwise, we can directly link the rowset files from the base tablet to the target tablet.

        if (base_tablet != nullptr &&

            base_tablet->data_dir()->path() == target_tablet->data_dir()->path()) {

            ref_tablet = std::move(base_tablet);

        }

    }

    res = _create_snapshot_files(ref_tablet, target_tablet, request, snapshot_path,

                                 allow_incremental_clone);

    if (!res.ok()) {

        LOG(WARNING) << "failed to make snapshot. res=" << res << " tablet=" << request.tablet_id;

        return res;

    }

    LOG(INFO) << "success to make snapshot. path=['" << *snapshot_path << "']";

    return res;

}

Status SnapshotManager::release_snapshot(const string& snapshot_path) {

    // If the requested snapshot_path is located in the root/snapshot folder, it is considered legal and can be deleted.

    // Otherwise, it is considered an illegal request and returns an error result.

    SCOPED_ATTACH_TASK(_mem_tracker);

    auto stores = _engine.get_stores();

    for (auto* store : stores) {

        std::string abs_path;

        RETURN_IF_ERROR(io::global_local_filesystem()->canonicalize(store->path(), &abs_path));

        if (snapshot_path.compare(0, abs_path.size(), abs_path) == 0 &&

            snapshot_path.compare(abs_path.size() + 1, SNAPSHOT_PREFIX.size(), SNAPSHOT_PREFIX) ==

                    0) {

            RETURN_IF_ERROR(io::global_local_filesystem()->delete_directory(snapshot_path));

            LOG(INFO) << "success to release snapshot path. [path='" << snapshot_path << "']";

            return Status::OK();

        }

    }

    return Status::Error<CE_CMD_PARAMS_ERROR>("released snapshot path illegal. [path='{}']",

                                              snapshot_path);

}

Result<std::vector<PendingRowsetGuard>> SnapshotManager::convert_rowset_ids(

        const std::string& clone_dir, int64_t tablet_id, int64_t replica_id, int64_t table_id,

        int64_t partition_id, int32_t schema_hash) {

    SCOPED_SWITCH_THREAD_MEM_TRACKER_LIMITER(_mem_tracker);

    std::vector<PendingRowsetGuard> guards;

    // check clone dir existed

    bool exists = true;

    RETURN_IF_ERROR_RESULT(io::global_local_filesystem()->exists(clone_dir, &exists));

    if (!exists) {

        return unexpected(Status::Error<DIR_NOT_EXIST>(

                "clone dir not existed when convert rowsetids. clone_dir={}", clone_dir));

    }

    // load original tablet meta

    auto cloned_meta_file = fmt::format("{}/{}.hdr", clone_dir, tablet_id);

    TabletMeta cloned_tablet_meta;

    RETURN_IF_ERROR_RESULT(cloned_tablet_meta.create_from_file(cloned_meta_file));

    TabletMetaPB cloned_tablet_meta_pb;

    cloned_tablet_meta.to_meta_pb(&cloned_tablet_meta_pb);

    TabletMetaPB new_tablet_meta_pb;

    new_tablet_meta_pb = cloned_tablet_meta_pb;

    new_tablet_meta_pb.clear_rs_metas();

    // inc_rs_meta is deprecated since 0.13.

    // keep this just for safety

    new_tablet_meta_pb.clear_inc_rs_metas();

    new_tablet_meta_pb.clear_stale_rs_metas();

    // should modify tablet id and schema hash because in restore process the tablet id is not

    // equal to tablet id in meta

    new_tablet_meta_pb.set_tablet_id(tablet_id);

    *new_tablet_meta_pb.mutable_tablet_uid() = TabletUid::gen_uid().to_proto();

    new_tablet_meta_pb.set_replica_id(replica_id);

    if (table_id > 0) {

        new_tablet_meta_pb.set_table_id(table_id);

    }

    if (partition_id != -1) {

        new_tablet_meta_pb.set_partition_id(partition_id);

    }

    new_tablet_meta_pb.set_schema_hash(schema_hash);

    TabletSchemaSPtr tablet_schema = std::make_shared<TabletSchema>();

    tablet_schema->init_from_pb(new_tablet_meta_pb.schema());

    std::unordered_map<Version, RowsetMetaPB*, HashOfVersion> rs_version_map;

    std::unordered_map<RowsetId, RowsetId> rowset_id_mapping;

    guards.reserve(cloned_tablet_meta_pb.rs_metas_size() +

                   cloned_tablet_meta_pb.stale_rs_metas_size());

    for (auto&& visible_rowset : cloned_tablet_meta_pb.rs_metas()) {

        RowsetMetaPB* rowset_meta = new_tablet_meta_pb.add_rs_metas();

        if (!visible_rowset.has_resource_id()) {

            // src be local rowset

            RowsetId rowset_id = _engine.next_rowset_id();

            guards.push_back(_engine.pending_local_rowsets().add(rowset_id));

            RETURN_IF_ERROR_RESULT(_rename_rowset_id(visible_rowset, clone_dir, tablet_schema,

                                                     rowset_id, rowset_meta));

            RowsetId src_rs_id;

            if (visible_rowset.rowset_id() > 0) {

                src_rs_id.init(visible_rowset.rowset_id());

            } else {

                src_rs_id.init(visible_rowset.rowset_id_v2());

            }

            rowset_id_mapping[src_rs_id] = rowset_id;

        } else {

            // remote rowset

            *rowset_meta = visible_rowset;

        }

        rowset_meta->set_tablet_id(tablet_id);

        if (partition_id != -1) {

            rowset_meta->set_partition_id(partition_id);

        }

        Version rowset_version = {visible_rowset.start_version(), visible_rowset.end_version()};

        rs_version_map[rowset_version] = rowset_meta;

    }

    for (auto&& stale_rowset : cloned_tablet_meta_pb.stale_rs_metas()) {

        Version rowset_version = {stale_rowset.start_version(), stale_rowset.end_version()};

        auto exist_rs = rs_version_map.find(rowset_version);

        if (exist_rs != rs_version_map.end()) {

            continue;

        }

        RowsetMetaPB* rowset_meta = new_tablet_meta_pb.add_stale_rs_metas();

        if (!stale_rowset.has_resource_id()) {

            // src be local rowset

            RowsetId rowset_id = _engine.next_rowset_id();

            guards.push_back(_engine.pending_local_rowsets().add(rowset_id));

            RETURN_IF_ERROR_RESULT(_rename_rowset_id(stale_rowset, clone_dir, tablet_schema,

                                                     rowset_id, rowset_meta));

            RowsetId src_rs_id;

            if (stale_rowset.rowset_id() > 0) {

                src_rs_id.init(stale_rowset.rowset_id());

            } else {

                src_rs_id.init(stale_rowset.rowset_id_v2());

            }

            rowset_id_mapping[src_rs_id] = rowset_id;

        } else {

            // remote rowset

            *rowset_meta = stale_rowset;

        }

        rowset_meta->set_tablet_id(tablet_id);

        if (partition_id != -1) {

            rowset_meta->set_partition_id(partition_id);

        }

    }

    if (!rowset_id_mapping.empty() && cloned_tablet_meta_pb.has_delete_bitmap()) {

        const auto& cloned_del_bitmap_pb = cloned_tablet_meta_pb.delete_bitmap();

        DeleteBitmapPB* new_del_bitmap_pb = new_tablet_meta_pb.mutable_delete_bitmap();

        int rst_ids_size = cloned_del_bitmap_pb.rowset_ids_size();

        for (size_t i = 0; i < rst_ids_size; ++i) {

            RowsetId rst_id;

            rst_id.init(cloned_del_bitmap_pb.rowset_ids(i));

            // It should not happen, if we can't convert some rowid in delete bitmap, the

            // data might be inconsist.

            CHECK(rowset_id_mapping.find(rst_id) != rowset_id_mapping.end())

                    << "can't find rowset_id " << rst_id.to_string() << " in convert_rowset_ids";

            new_del_bitmap_pb->set_rowset_ids(i, rowset_id_mapping[rst_id].to_string());

        }

    }

    RETURN_IF_ERROR_RESULT(TabletMeta::save(cloned_meta_file, new_tablet_meta_pb));

    return guards;

}

Status SnapshotManager::_rename_rowset_id(const RowsetMetaPB& rs_meta_pb,

                                          const std::string& new_tablet_path,

                                          TabletSchemaSPtr tablet_schema, const RowsetId& rowset_id,

                                          RowsetMetaPB* new_rs_meta_pb) {

    Status res = Status::OK();

    RowsetMetaSharedPtr rowset_meta(new RowsetMeta());

    rowset_meta->init_from_pb(rs_meta_pb);

    RowsetSharedPtr org_rowset;

    RETURN_IF_ERROR(

            RowsetFactory::create_rowset(tablet_schema, new_tablet_path, rowset_meta, &org_rowset));

    // do not use cache to load index

    // because the index file may conflict

    // and the cached fd may be invalid

    RETURN_IF_ERROR(org_rowset->load(false));

    RowsetMetaSharedPtr org_rowset_meta = org_rowset->rowset_meta();

    RowsetWriterContext context;

    context.rowset_id = rowset_id;

    context.tablet_id = org_rowset_meta->tablet_id();

    context.partition_id = org_rowset_meta->partition_id();

    context.tablet_schema_hash = org_rowset_meta->tablet_schema_hash();

    context.rowset_type = org_rowset_meta->rowset_type();

    context.tablet_path = new_tablet_path;

    context.tablet_schema =

            org_rowset_meta->tablet_schema() ? org_rowset_meta->tablet_schema() : tablet_schema;

    context.rowset_state = org_rowset_meta->rowset_state();

    context.version = org_rowset_meta->version();

    context.newest_write_timestamp = org_rowset_meta->newest_write_timestamp();

    // keep segments_overlap same as origin rowset

    context.segments_overlap = rowset_meta->segments_overlap();

    auto rs_writer = DORIS_TRY(RowsetFactory::create_rowset_writer(_engine, context, false));

    res = rs_writer->add_rowset(org_rowset);

    if (!res.ok()) {

        LOG(WARNING) << "failed to add rowset "

                     << " id = " << org_rowset->rowset_id() << " to rowset " << rowset_id;

        return res;

    }

    RowsetSharedPtr new_rowset;

    RETURN_NOT_OK_STATUS_WITH_WARN(rs_writer->build(new_rowset),

                                   "failed to build rowset when rename rowset id");

    RETURN_IF_ERROR(new_rowset->load(false));

    new_rowset->rowset_meta()->to_rowset_pb(new_rs_meta_pb);

    RETURN_IF_ERROR(org_rowset->remove());

    return Status::OK();

}

// get snapshot path: curtime.seq.timeout

// eg: 20190819221234.3.86400

Status SnapshotManager::_calc_snapshot_id_path(const TabletSharedPtr& tablet, int64_t timeout_s,

                                               std::string* out_path) {

    Status res = Status::OK();

    if (out_path == nullptr) {

        return Status::Error<INVALID_ARGUMENT>("output parameter cannot be null");

    }

    // get current timestamp string

    string time_str;

    if ((res = gen_timestamp_string(&time_str)) != Status::OK()) {

        LOG(WARNING) << "failed to generate time_string when move file to trash."

                     << "err code=" << res;

        return res;

    }

    uint64_t sid = _snapshot_base_id.fetch_add(1, std::memory_order_relaxed) - 1;

    *out_path = fmt::format("{}/{}/{}.{}.{}", tablet->data_dir()->path(), SNAPSHOT_PREFIX, time_str,

                            sid, timeout_s);

    return res;

}

// prefix: /path/to/data/DATA_PREFIX/shard_id

// return: /path/to/data/DATA_PREFIX/shard_id/tablet_id/schema_hash

std::string SnapshotManager::get_schema_hash_full_path(const TabletSharedPtr& ref_tablet,

                                                       const std::string& prefix) {

    return fmt::format("{}/{}/{}", prefix, ref_tablet->tablet_id(), ref_tablet->schema_hash());

}

std::string SnapshotManager::_get_header_full_path(const TabletSharedPtr& ref_tablet,

                                                   const std::string& schema_hash_path) const {

    return fmt::format("{}/{}.hdr", schema_hash_path, ref_tablet->tablet_id());

}

std::string SnapshotManager::_get_json_header_full_path(const TabletSharedPtr& ref_tablet,

                                                        const std::string& schema_hash_path) const {

    return fmt::format("{}/{}.hdr.json", schema_hash_path, ref_tablet->tablet_id());

}

Status SnapshotManager::_link_index_and_data_files(

        const std::string& schema_hash_path, const TabletSharedPtr& ref_tablet,

        const std::vector<RowsetSharedPtr>& consistent_rowsets) {

    Status res = Status::OK();

    for (auto& rs : consistent_rowsets) {

        RETURN_IF_ERROR(rs->link_files_to(schema_hash_path, rs->rowset_id()));

    }

    return res;

}

Status SnapshotManager::_create_snapshot_files(const TabletSharedPtr& ref_tablet,

                                               const TabletSharedPtr& target_tablet,

                                               const TSnapshotRequest& request,

                                               string* snapshot_path,

                                               bool* allow_incremental_clone) {

    int32_t snapshot_version = request.preferred_snapshot_version;

    LOG(INFO) << "receive a make snapshot request"

              << ", request detail is " << apache::thrift::ThriftDebugString(request)

              << ", snapshot_version is " << snapshot_version;

    Status res = Status::OK();

    if (snapshot_path == nullptr) {

        return Status::Error<INVALID_ARGUMENT>("output parameter cannot be null");

    }

    // snapshot_id_path:

    //      /data/shard_id/tablet_id/snapshot/time_str/id.timeout/

    int64_t timeout_s = config::snapshot_expire_time_sec;

    if (request.__isset.timeout) {

        timeout_s = request.timeout;

    }

    std::string snapshot_id_path;

    res = _calc_snapshot_id_path(target_tablet, timeout_s, &snapshot_id_path);

    if (!res.ok()) {

        LOG(WARNING) << "failed to calc snapshot_id_path, tablet="

                     << target_tablet->data_dir()->path();

        return res;

    }

    bool is_copy_binlog = request.__isset.is_copy_binlog ? request.is_copy_binlog : false;

    // schema_full_path_desc.filepath:

    //      /snapshot_id_path/tablet_id/schema_hash/

    auto schema_full_path = get_schema_hash_full_path(target_tablet, snapshot_id_path);

    // header_path:

    //      /schema_full_path/tablet_id.hdr

    auto header_path = _get_header_full_path(target_tablet, schema_full_path);

    //      /schema_full_path/tablet_id.hdr.json

    auto json_header_path = _get_json_header_full_path(target_tablet, schema_full_path);

    bool exists = true;

    RETURN_IF_ERROR(io::global_local_filesystem()->exists(schema_full_path, &exists));

    if (exists) {

        VLOG_TRACE << "remove the old schema_full_path." << schema_full_path;

        RETURN_IF_ERROR(io::global_local_filesystem()->delete_directory(schema_full_path));

    }

    RETURN_IF_ERROR(io::global_local_filesystem()->create_directory(schema_full_path));

    string snapshot_id;

    RETURN_IF_ERROR(io::global_local_filesystem()->canonicalize(snapshot_id_path, &snapshot_id));

    std::vector<RowsetSharedPtr> consistent_rowsets;

    do {

        TabletMetaSharedPtr new_tablet_meta(new (nothrow) TabletMeta());

        if (new_tablet_meta == nullptr) {

            res = Status::Error<MEM_ALLOC_FAILED>("fail to malloc TabletMeta.");

            break;

        }

        DeleteBitmap delete_bitmap_snapshot(new_tablet_meta->tablet_id());

        /// If set missing_version, try to get all missing version.

        /// If some of them not exist in tablet, we will fall back to

        /// make the full snapshot of the tablet.

        {

            std::shared_lock rdlock(ref_tablet->get_header_lock());

            if (ref_tablet->tablet_state() == TABLET_SHUTDOWN) {

                return Status::Aborted("tablet has shutdown");

            }

            bool is_single_rowset_clone =

                    (request.__isset.start_version && request.__isset.end_version);

            if (is_single_rowset_clone) {

                LOG(INFO) << "handle compaction clone make snapshot, tablet_id: "

                          << ref_tablet->tablet_id();

                Version version(request.start_version, request.end_version);

                const RowsetSharedPtr rowset = ref_tablet->get_rowset_by_version(version, false);

                if (rowset && rowset->is_local()) {

                    consistent_rowsets.push_back(rowset);

                } else {

                    LOG(WARNING) << "failed to find local version when do compaction snapshot. "

                                 << " tablet=" << request.tablet_id

                                 << " schema_hash=" << request.schema_hash

                                 << " version=" << version;

                    res = Status::InternalError(

                            "failed to find version when do compaction snapshot");

                    break;

                }

            }

            // be would definitely set it as true no matter has missed version or not

            // but it would take no effets on the following range loop

            if (!is_single_rowset_clone && request.__isset.missing_version) {

                for (int64_t missed_version : request.missing_version) {

                    Version version = {missed_version, missed_version};

                    // find rowset in both rs_meta and stale_rs_meta

                    const RowsetSharedPtr rowset = ref_tablet->get_rowset_by_version(version, true);

                    if (rowset != nullptr) {

                        if (!rowset->is_local()) {

                            // MUST make full snapshot to ensure `cooldown_meta_id` is consistent with the cooldowned rowsets after clone.

                            res = Status::Error<ErrorCode::INTERNAL_ERROR>(

                                    "missed version is a cooldowned rowset, must make full "

                                    "snapshot. missed_version={}, tablet_id={}",

                                    missed_version, ref_tablet->tablet_id());

                            break;

                        }

                        consistent_rowsets.push_back(rowset);

                    } else {

                        res = Status::InternalError(

                                "failed to find missed version when snapshot. tablet={}, "

                                "schema_hash={}, version={}",

                                request.tablet_id, request.schema_hash, version.to_string());

                        break;

                    }

                }

            }

            DBUG_EXECUTE_IF("SnapshotManager.create_snapshot_files.allow_inc_clone", {

                auto tablet_id = dp->param("tablet_id", 0);

                auto is_full_clone = dp->param("is_full_clone", false);

                if (ref_tablet->tablet_id() == tablet_id && is_full_clone) {

                    LOG(INFO) << "injected full clone for tabelt: " << tablet_id;

                    res = Status::InternalError("fault injection error");

                }

            });

            // be would definitely set it as true no matter has missed version or not, we could

            // just check whether the missed version is empty or not

            int64_t version = -1;

            if (!is_single_rowset_clone && (!res.ok() || request.missing_version.empty())) {

                if (!request.__isset.missing_version &&

                    ref_tablet->tablet_meta()->cooldown_meta_id().initialized()) {

                    LOG(WARNING) << "currently not support backup tablet with cooldowned remote "

                                    "data. tablet="

                                 << request.tablet_id;

                    return Status::NotSupported(

                            "currently not support backup tablet with cooldowned remote data");

                }

                /// not all missing versions are found, fall back to full snapshot.

                res = Status::OK();         // reset res

                consistent_rowsets.clear(); // reset vector

                // get latest version

                const RowsetSharedPtr last_version = ref_tablet->get_rowset_with_max_version();

                if (last_version == nullptr) {

                    res = Status::InternalError("tablet has not any version. path={}",

                                                ref_tablet->tablet_id());

                    break;

                }

                // get snapshot version, use request.version if specified

                version = last_version->end_version();

                if (request.__isset.version) {

                    if (last_version->end_version() < request.version) {

                        res = Status::Error<INVALID_ARGUMENT>(

                                "invalid make snapshot request. version={}, req_version={}",

                                last_version->version().to_string(), request.version);

                        break;

                    }

                    version = request.version;

                }

                if (ref_tablet->tablet_meta()->cooldown_meta_id().initialized()) {

                    // Tablet has cooldowned data, MUST pick consistent rowsets with continuous cooldowned version

                    // Get max cooldowned version

                    int64_t max_cooldowned_version = -1;

                    for (auto& [v, rs] : ref_tablet->rowset_map()) {

                        if (rs->is_local()) {

                            continue;

                        }

                        consistent_rowsets.push_back(rs);

                        max_cooldowned_version = std::max(max_cooldowned_version, v.second);

                    }

                    DCHECK_GE(max_cooldowned_version, 1) << "tablet_id=" << ref_tablet->tablet_id();

                    std::sort(consistent_rowsets.begin(), consistent_rowsets.end(),

                              Rowset::comparator);

                    res = check_version_continuity(consistent_rowsets);

                    if (res.ok() && max_cooldowned_version < version) {

                        // Pick consistent rowsets of remaining required version

                        res = ref_tablet->capture_consistent_rowsets_unlocked(

                                {max_cooldowned_version + 1, version}, &consistent_rowsets);

                    }

                } else {

                    // get shortest version path

                    res = ref_tablet->capture_consistent_rowsets_unlocked(Version(0, version),

                                                                          &consistent_rowsets);

                }

                if (!res.ok()) {

                    LOG(WARNING) << "fail to select versions to span. res=" << res;

                    break;

                }

                *allow_incremental_clone = false;

            } else {

                version = ref_tablet->max_version_unlocked();

                *allow_incremental_clone = true;

            }

            // copy the tablet meta to new_tablet_meta inside header lock

            CHECK(res.ok()) << res;

            ref_tablet->generate_tablet_meta_copy_unlocked(*new_tablet_meta);

            // The delete bitmap update operation and the add_inc_rowset operation is not atomic,

            // so delete bitmap may contains some data generated by invisible rowset, we should

            // get rid of these useless bitmaps when doing snapshot.

            if (ref_tablet->keys_type() == UNIQUE_KEYS &&

                ref_tablet->enable_unique_key_merge_on_write()) {

                delete_bitmap_snapshot =

                        ref_tablet->tablet_meta()->delete_bitmap().snapshot(version);

            }

        }

        std::vector<RowsetMetaSharedPtr> rs_metas;

        for (auto& rs : consistent_rowsets) {

            if (rs->is_local()) {

                // local rowset

                res = rs->link_files_to(schema_full_path, rs->rowset_id());

                if (!res.ok()) {

                    break;

                }

            }

            rs_metas.push_back(rs->rowset_meta());

            VLOG_NOTICE << "add rowset meta to clone list. "

                        << " start version " << rs->rowset_meta()->start_version()

                        << " end version " << rs->rowset_meta()->end_version() << " empty "

                        << rs->rowset_meta()->empty();

        }

        if (!res.ok()) {

            LOG(WARNING) << "fail to create hard link. path=" << snapshot_id_path

                         << " tablet=" << target_tablet->tablet_id()

                         << " ref tablet=" << ref_tablet->tablet_id();

            break;

        }

        // The inc_rs_metas is deprecated since Doris version 0.13.

        // Clear it for safety reason.

        // Whether it is incremental or full snapshot, rowset information is stored in rs_meta.

        new_tablet_meta->revise_rs_metas(std::move(rs_metas));

        if (ref_tablet->keys_type() == UNIQUE_KEYS &&

            ref_tablet->enable_unique_key_merge_on_write()) {

            new_tablet_meta->revise_delete_bitmap_unlocked(delete_bitmap_snapshot);

        }

        if (snapshot_version == g_Types_constants.TSNAPSHOT_REQ_VERSION2) {

            res = new_tablet_meta->save(header_path);

            if (res.ok() && request.__isset.is_copy_tablet_task && request.is_copy_tablet_task) {

                res = new_tablet_meta->save_as_json(json_header_path);

            }

        } else {

            res = Status::Error<INVALID_SNAPSHOT_VERSION>(

                    "snapshot_version not equal to g_Types_constants.TSNAPSHOT_REQ_VERSION2");

        }

        if (!res.ok()) {

            LOG(WARNING) << "convert rowset failed, res:" << res

                         << ", tablet:" << new_tablet_meta->tablet_id()

                         << ", schema hash:" << new_tablet_meta->schema_hash()

                         << ", snapshot_version:" << snapshot_version

                         << ", is incremental:" << request.__isset.missing_version;

            break;

        }

    } while (false);

    // link all binlog files to snapshot path

    do {

        if (!res.ok()) {

            break;

        }

        if (!is_copy_binlog) {

            break;

        }

        RowsetBinlogMetasPB rowset_binlog_metas_pb;

        for (auto& rs : consistent_rowsets) {

            if (!rs->is_local()) {

                continue;

            }

            res = ref_tablet->get_rowset_binlog_metas(rs->version(), &rowset_binlog_metas_pb);

            if (!res.ok()) {

                break;

            }

        }

        if (!res.ok() || rowset_binlog_metas_pb.rowset_binlog_metas_size() == 0) {

            break;

        }

        // write to pb file

        auto rowset_binlog_metas_pb_filename =

                fmt::format("{}/rowset_binlog_metas.pb", schema_full_path);

        res = write_pb(rowset_binlog_metas_pb_filename, rowset_binlog_metas_pb);

        if (!res.ok()) {

            break;

        }

        for (const auto& rowset_binlog_meta : rowset_binlog_metas_pb.rowset_binlog_metas()) {

            std::string segment_file_path;

            auto num_segments = rowset_binlog_meta.num_segments();

            std::string_view rowset_id = rowset_binlog_meta.rowset_id();

            RowsetMetaPB rowset_meta_pb;

            if (!rowset_meta_pb.ParseFromString(rowset_binlog_meta.data())) {

                auto err_msg = fmt::format("fail to parse binlog meta data value:{}",

                                           rowset_binlog_meta.data());

                res = Status::InternalError(err_msg);

                LOG(WARNING) << err_msg;

                return res;

            }

            const auto& tablet_schema_pb = rowset_meta_pb.tablet_schema();

            TabletSchema tablet_schema;

            tablet_schema.init_from_pb(tablet_schema_pb);

            std::vector<string> linked_success_files;

            Defer remove_linked_files {[&]() { // clear linked files if errors happen

                if (!res.ok()) {

                    LOG(WARNING) << "will delete linked success files due to error " << res;

                    std::vector<io::Path> paths;

                    for (auto& file : linked_success_files) {

                        paths.emplace_back(file);

                        LOG(WARNING)

                                << "will delete linked success file " << file << " due to error";

                    }

                    static_cast<void>(io::global_local_filesystem()->batch_delete(paths));

                    LOG(WARNING) << "done delete linked success files due to error " << res;

                }

            }};

            // link segment files and index files

            for (int64_t segment_index = 0; segment_index < num_segments; ++segment_index) {

                segment_file_path = ref_tablet->get_segment_filepath(rowset_id, segment_index);

                auto snapshot_segment_file_path =

                        fmt::format("{}/{}_{}.binlog", schema_full_path, rowset_id, segment_index);

                res = io::global_local_filesystem()->link_file(segment_file_path,

                                                               snapshot_segment_file_path);

                if (!res.ok()) {

                    LOG(WARNING) << "fail to link binlog file. [src=" << segment_file_path

                                 << ", dest=" << snapshot_segment_file_path << "]";

                    break;

                }

                linked_success_files.push_back(snapshot_segment_file_path);

                if (tablet_schema.get_inverted_index_storage_format() ==

                    InvertedIndexStorageFormatPB::V1) {

                    for (const auto& index : tablet_schema.inverted_indexes()) {

                        auto index_id = index->index_id();

                        auto index_file = ref_tablet->get_segment_index_filepath(

                                rowset_id, segment_index, index_id);

                        auto snapshot_segment_index_file_path =

                                fmt::format("{}/{}_{}_{}.binlog-index", schema_full_path, rowset_id,

                                            segment_index, index_id);

                        VLOG_DEBUG << "link " << index_file << " to "

                                   << snapshot_segment_index_file_path;

                        res = io::global_local_filesystem()->link_file(

                                index_file, snapshot_segment_index_file_path);

                        if (!res.ok()) {

                            LOG(WARNING) << "fail to link binlog index file. [src=" << index_file

                                         << ", dest=" << snapshot_segment_index_file_path << "]";

                            break;

                        }

                        linked_success_files.push_back(snapshot_segment_index_file_path);

                    }

                } else {

                    if (tablet_schema.has_inverted_index()) {

                        auto index_file = InvertedIndexDescriptor::get_index_file_path_v2(

                                InvertedIndexDescriptor::get_index_file_path_prefix(

                                        segment_file_path));

                        auto snapshot_segment_index_file_path =

                                fmt::format("{}/{}_{}.binlog-index", schema_full_path, rowset_id,

                                            segment_index);

                        VLOG_DEBUG << "link " << index_file << " to "

                                   << snapshot_segment_index_file_path;

                        res = io::global_local_filesystem()->link_file(

                                index_file, snapshot_segment_index_file_path);

                        if (!res.ok()) {

                            LOG(WARNING) << "fail to link binlog index file. [src=" << index_file

                                         << ", dest=" << snapshot_segment_index_file_path << "]";

                            break;

                        }

                        linked_success_files.push_back(snapshot_segment_index_file_path);

                    }

                }

            }

            if (!res.ok()) {

                break;

            }

        }

    } while (false);

    if (!res.ok()) {

        LOG(WARNING) << "fail to make snapshot, try to delete the snapshot path. path="

                     << snapshot_id_path.c_str();

        bool exists = true;

        RETURN_IF_ERROR(io::global_local_filesystem()->exists(snapshot_id_path, &exists));

        if (exists) {

            VLOG_NOTICE << "remove snapshot path. [path=" << snapshot_id_path << "]";

            RETURN_IF_ERROR(io::global_local_filesystem()->delete_directory(snapshot_id_path));

        }

    } else {

        *snapshot_path = snapshot_id;

    }

    return res;

}

} // namespace doris