// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#pragma once

#include <butil/macros.h>

#include <bvar/bvar.h>

#include <gen_cpp/Types_types.h>

#include <gen_cpp/internal_service.pb.h>

#include <gen_cpp/olap_file.pb.h>

#include <atomic>

#include <condition_variable>

#include <cstdint>

#include <ctime>

#include <map>

#include <memory>

#include <mutex>

#include <set>

#include <shared_mutex>

#include <string>

#include <unordered_map>

#include <unordered_set>

#include <vector>

#include "agent/task_worker_pool.h"

#include "common/config.h"

#include "common/status.h"

#include "runtime/heartbeat_flags.h"

#include "storage/adaptive_thread_pool_controller.h"

#include "storage/compaction/compaction_permit_limiter.h"

#include "storage/delete/calc_delete_bitmap_executor.h"

#include "storage/olap_common.h"

#include "storage/options.h"

#include "storage/rowset/pending_rowset_helper.h"

#include "storage/rowset/rowset_fwd.h"

#include "storage/segment/segment.h"

#include "storage/tablet/tablet_fwd.h"

#include "storage/task/index_builder.h"

#include "util/countdown_latch.h"

namespace doris {

class DataDir;

class EngineTask;

class MemTableFlushExecutor;

class SegcompactionWorker;

class BaseCompaction;

class CumulativeCompaction;

class CumulativeCompactionPolicy;

class StreamLoadRecorder;

class TCloneReq;

class TCreateTabletReq;

class TabletManager;

class Thread;

class ThreadPool;

class TxnManager;

class ReportWorker;

class CreateTabletRRIdxCache;

struct DirInfo;

class SnapshotManager;

class WorkloadGroup;

using SegCompactionCandidates = std::vector<segment_v2::SegmentSharedPtr>;

using SegCompactionCandidatesSharedPtr = std::shared_ptr<SegCompactionCandidates>;

using CumuCompactionPolicyTable =

        std::unordered_map<std::string_view, std::shared_ptr<CumulativeCompactionPolicy>>;

class StorageEngine;

class CloudStorageEngine;

extern bvar::Status<int64_t> g_max_rowsets_with_useless_delete_bitmap;

extern bvar::Status<int64_t> g_max_rowsets_with_useless_delete_bitmap_version;

// StorageEngine singleton to manage all Table pointers.

// Providing add/drop/get operations.

// StorageEngine instance doesn't own the Table resources, just hold the pointer,

// allocation/deallocation must be done outside.

class BaseStorageEngine {

protected:

    enum Type : uint8_t {

        LOCAL, // Shared-nothing integrated compute and storage architecture

        CLOUD, // Separating compute and storage architecture

    };

    Type _type;

public:

    BaseStorageEngine(Type type, const UniqueId& backend_uid);

    virtual ~BaseStorageEngine();

    StorageEngine& to_local();

    CloudStorageEngine& to_cloud();

    virtual Status open() = 0;

    virtual void stop() = 0;

    virtual bool stopped() = 0;

    // start all background threads. This should be call after env is ready.

    virtual Status start_bg_threads(std::shared_ptr<WorkloadGroup> wg_sptr = nullptr) = 0;

    /* Parameters:

     * - tablet_id: the id of tablet to get

     * - sync_stats: the stats of sync rowset

     * - force_use_only_cached: whether only use cached tablet meta

     * - cache_on_miss: whether cache the tablet meta when missing in cache

     */

    virtual Result<BaseTabletSPtr> get_tablet(int64_t tablet_id,

                                              SyncRowsetStats* sync_stats = nullptr,

                                              bool force_use_only_cached = false,

                                              bool cache_on_miss = true) = 0;

    virtual Status get_tablet_meta(int64_t tablet_id, TabletMetaSharedPtr* tablet_meta,

                                   bool force_use_only_cached = false) = 0;

    void register_row_binlog_tablet(const BaseTabletSPtr& tablet);

    // Catalog discovery refreshes cached Cloud metadata too, including tablets with no recent reads.

    Status submit_row_binlog_ttl(int64_t tablet_id, bool refresh_cloud_meta = false);

    void register_report_listener(ReportWorker* listener);

    void deregister_report_listener(ReportWorker* listener);

    void notify_listeners();

    bool notify_listener(std::string_view name);

    void set_heartbeat_flags(HeartbeatFlags* heartbeat_flags) {

        _heartbeat_flags = heartbeat_flags;

    }

    virtual Status set_cluster_id(int32_t cluster_id) = 0;

    int32_t effective_cluster_id() const { return _effective_cluster_id; }

    RowsetId next_rowset_id();

    MemTableFlushExecutor* memtable_flush_executor() { return _memtable_flush_executor.get(); }

    AdaptiveThreadPoolController* adaptive_thread_controller() {

        return &_adaptive_thread_controller;

    }

    CalcDeleteBitmapExecutor* calc_delete_bitmap_executor() {

        return _calc_delete_bitmap_executor.get();

    }

    CalcDeleteBitmapExecutor* calc_delete_bitmap_executor_for_load() {

        return _calc_delete_bitmap_executor_for_load.get();

    }

    int64_t memory_limitation_bytes_per_thread_for_schema_change() const;

    int get_disk_num() { return _disk_num; }

    Status init_stream_load_recorder(const std::string& stream_load_record_path);

    const std::shared_ptr<StreamLoadRecorder>& get_stream_load_recorder() {

        return _stream_load_recorder;

    }

protected:

    void _start_adaptive_thread_controller();

    void _gc_expired_id_file_map();

    void _gc_expired_id_file_map_thread_callback();

    bool _should_delay_large_task();

    int32_t _effective_cluster_id = -1;

    HeartbeatFlags* _heartbeat_flags = nullptr;

    // For task, tablet and disk report

    std::mutex _report_mtx;

    std::vector<ReportWorker*> _report_listeners;

    std::unique_ptr<RowsetIdGenerator> _rowset_id_generator;

    std::unique_ptr<MemTableFlushExecutor> _memtable_flush_executor;

    AdaptiveThreadPoolController _adaptive_thread_controller;

    std::unique_ptr<CalcDeleteBitmapExecutor> _calc_delete_bitmap_executor;

    std::unique_ptr<CalcDeleteBitmapExecutor> _calc_delete_bitmap_executor_for_load;

    CountDownLatch _stop_background_threads_latch;

    Status _start_row_binlog_ttl_scanner();

    void _stop_row_binlog_ttl_scanner();

    std::mutex _row_binlog_ttl_mutex;

    std::map<int64_t, std::weak_ptr<BaseTablet>> _row_binlog_ttl_tablets;

    std::unordered_set<int64_t> _row_binlog_ttl_pending;

    std::unique_ptr<ThreadPool> _row_binlog_ttl_prepare_pool;

    std::shared_ptr<Thread> _row_binlog_ttl_scan_thread;

    std::shared_ptr<Thread> _id_file_map_gc_thread;

    int64_t _memory_limitation_bytes_for_schema_change;

    int _disk_num {-1};

    std::shared_ptr<StreamLoadRecorder> _stream_load_recorder;

    std::shared_ptr<bvar::Status<size_t>> _tablet_max_delete_bitmap_score_metrics;

    std::shared_ptr<bvar::Status<size_t>> _tablet_max_base_rowset_delete_bitmap_score_metrics;

    std::unique_ptr<ThreadPool> _base_compaction_thread_pool;

    std::unique_ptr<ThreadPool> _cumu_compaction_thread_pool;

    std::unique_ptr<ThreadPool> _binlog_compaction_thread_pool;

    int _cumu_compaction_thread_pool_used_threads {0};

    int _cumu_compaction_thread_pool_small_tasks_running {0};

};

class CompactionSubmitRegistry {

    using TabletSet = std::unordered_set<TabletSharedPtr>;

    using Registry = std::map<DataDir*, TabletSet>;

public:

    CompactionSubmitRegistry() = default;

    CompactionSubmitRegistry(CompactionSubmitRegistry&& r);

    // create a snapshot for current registry, operations to the snapshot can be lock-free.

    CompactionSubmitRegistry create_snapshot();

    void reset(const std::vector<DataDir*>& stores);

    uint32_t count_executing_compaction(DataDir* dir, CompactionType compaction_type);

    uint32_t count_executing_cumu_and_base(DataDir* dir);

    bool has_compaction_task(DataDir* dir, CompactionType compaction_type);

    bool insert(TabletSharedPtr tablet, CompactionType compaction_type);

    void remove(TabletSharedPtr tablet, CompactionType compaction_type,

                std::function<void()> wakeup_cb);

    void jsonfy_compaction_status(std::string* result);

    std::vector<TabletCompactionContext> pick_topn_tablets_for_compaction(

            TabletManager* tablet_mgr, DataDir* data_dir, CompactionType compaction_type,

            const CumuCompactionPolicyTable& cumu_compaction_policies,

            CompactionScoreStats* disk_score_stats);

private:

    TabletSet& _get_tablet_set(DataDir* dir, CompactionType compaction_type);

    std::mutex _tablet_submitted_compaction_mutex;

    Registry _tablet_submitted_cumu_compaction;

    Registry _tablet_submitted_base_compaction;

    Registry _tablet_submitted_full_compaction;

    Registry _tablet_submitted_binlog_compaction;

};

class StorageEngine final : public BaseStorageEngine {

public:

    StorageEngine(const EngineOptions& options);

    ~StorageEngine() override;

    Status open() override;

    Status create_tablet(const TCreateTabletReq& request, RuntimeProfile* profile);

    /* Parameters:

     * - tablet_id: the id of tablet to get

     * - sync_stats: the stats of sync rowset

     * - force_use_only_cached: whether only use cached tablet meta

     * - cache_on_miss: whether cache the tablet meta when missing in cache

     */

    Result<BaseTabletSPtr> get_tablet(int64_t tablet_id, SyncRowsetStats* sync_stats = nullptr,

                                      bool force_use_only_cached = false,

                                      bool cache_on_miss = true) override;

    Status get_tablet_meta(int64_t tablet_id, TabletMetaSharedPtr* tablet_meta,

                           bool force_use_only_cached = false) override;

    void clear_transaction_task(const TTransactionId transaction_id);

    void clear_transaction_task(const TTransactionId transaction_id,

                                const std::vector<TPartitionId>& partition_ids);

    std::vector<DataDir*> get_stores(bool include_unused = false);

    // get all info of root_path

    Status get_all_data_dir_info(std::vector<DataDirInfo>* data_dir_infos, bool need_update);

    static int64_t get_file_or_directory_size(const std::string& file_path);

    // get root path for creating tablet. The returned vector of root path should be round robin,

    // for avoiding that all the tablet would be deployed one disk.

    std::vector<DataDir*> get_stores_for_create_tablet(int64_t partition_id,

                                                       TStorageMedium::type storage_medium);

    DataDir* get_store(const std::string& path);

    uint32_t available_storage_medium_type_count() const {

        return _available_storage_medium_type_count;

    }

    Status set_cluster_id(int32_t cluster_id) override;

    void start_delete_unused_rowset();

    void add_unused_rowset(RowsetSharedPtr rowset);

    using DeleteBitmapKeyRanges =

            std::vector<std::tuple<DeleteBitmap::BitmapKey, DeleteBitmap::BitmapKey>>;

    void add_unused_delete_bitmap_key_ranges(int64_t tablet_id,

                                             const std::vector<RowsetId>& rowsets,

                                             const DeleteBitmapKeyRanges& key_ranges);

    // Obtain shard path for new tablet.

    //

    // @param [out] shard_path choose an available root_path to clone new tablet

    // @return error code

    Status obtain_shard_path(TStorageMedium::type storage_medium, int64_t path_hash,

                             std::string* shared_path, DataDir** store, int64_t partition_id);

    // Load new tablet to make it effective.

    //

    // @param [in] root_path specify root path of new tablet

    // @param [in] request specify new tablet info

    // @param [in] restore whether we're restoring a tablet from trash

    // @return OK if load tablet success

    Status load_header(const std::string& shard_path, const TCloneReq& request,

                       bool restore = false);

    TabletManager* tablet_manager() { return _tablet_manager.get(); }

    TxnManager* txn_manager() { return _txn_manager.get(); }

    SnapshotManager* snapshot_mgr() { return _snapshot_mgr.get(); }

    // Rowset garbage collection helpers

    bool check_rowset_id_in_unused_rowsets(const RowsetId& rowset_id);

    PendingRowsetSet& pending_local_rowsets() { return _pending_local_rowsets; }

    PendingRowsetSet& pending_remote_rowsets() { return _pending_remote_rowsets; }

    PendingRowsetGuard add_pending_rowset(const RowsetWriterContext& ctx);

    RowsetTypePB default_rowset_type() const {

        if (_heartbeat_flags != nullptr && _heartbeat_flags->is_set_default_rowset_type_to_beta()) {

            return BETA_ROWSET;

        }

        return _default_rowset_type;

    }

    Status start_bg_threads(std::shared_ptr<WorkloadGroup> wg_sptr = nullptr) override;

    // clear trash and snapshot file

    // option: update disk usage after sweep

    Status start_trash_sweep(double* usage, bool ignore_guard = false);

    // Must call stop() before storage_engine is deconstructed

    void stop() override;

    void get_tablet_rowset_versions(const PGetTabletVersionsRequest* request,

                                    PGetTabletVersionsResponse* response);

    bool get_peers_replica_backends(int64_t tablet_id, std::vector<TBackend>* backends);

    const std::shared_ptr<StreamLoadRecorder>& get_stream_load_recorder() {

        return _stream_load_recorder;

    }

    void get_compaction_status_json(std::string* result);

    Status submit_compaction_task(TabletSharedPtr tablet, CompactionType compaction_type,

                                  bool force, bool eager = true, int trigger_method = 0);

    Status submit_seg_compaction_task(std::shared_ptr<SegcompactionWorker> worker,

                                      SegCompactionCandidatesSharedPtr segments);

    ThreadPool* tablet_publish_txn_thread_pool() { return _tablet_publish_txn_thread_pool.get(); }

    bool stopped() override { return _stopped; }

    Status process_index_change_task(const TAlterInvertedIndexReq& reqest);

    void gc_binlogs(const std::unordered_map<int64_t, int64_t>& gc_tablet_infos);

    void add_async_publish_task(int64_t partition_id, int64_t tablet_id, int64_t publish_version,

                                int64_t transaction_id, bool is_recover, int64_t commit_tso);

    int64_t get_pending_publish_min_version(int64_t tablet_id);

    bool add_broken_path(std::string path);

    bool remove_broken_path(std::string path);

    std::set<std::string> get_broken_paths() { return _broken_paths; }

    Status submit_clone_task(Tablet* tablet, int64_t version);

    std::unordered_map<int64_t, std::unique_ptr<TaskWorkerPoolIf>>* workers;

    int64_t get_compaction_num_per_round() const { return _compaction_num_per_round; }

#ifdef BE_TEST

    std::vector<TabletSharedPtr> generate_compaction_tasks_for_test(

            CompactionType compaction_type, std::vector<DataDir*>& data_dirs, bool check_score) {

        auto tablet_contexts = _generate_compaction_tasks(compaction_type, data_dirs, check_score);

        std::vector<TabletSharedPtr> tablets;

        tablets.reserve(tablet_contexts.size());

        for (auto& context : tablet_contexts) {

            tablets.emplace_back(std::move(context.tablet));

        }

        return tablets;

    }

    CompactionSubmitRegistry& compaction_submit_registry_for_test() {

        return _compaction_submit_registry;

    }

#endif

private:

    // Instance should be inited from `static open()`

    // MUST NOT be called in other circumstances.

    Status _open();

    Status _init_store_map();

    void _update_storage_medium_type_count();

    // Some check methods

    Status _check_file_descriptor_number();

    Status _check_all_root_path_cluster_id();

    Status _judge_and_update_effective_cluster_id(int32_t cluster_id);

    void _exit_if_too_many_disks_are_failed();

    void _clean_unused_txns();

    void _clean_unused_rowset_metas();

    void _clean_unused_binlog_metas();

    void _clean_unused_delete_bitmap();

    void _clean_unused_pending_publish_info();

    void _clean_unused_partial_update_info();

    Status _do_sweep(const std::string& scan_root, const time_t& local_tm_now,

                     const int32_t expire);

    // All these xxx_callback() functions are for Background threads

    // unused rowset monitor thread

    void _unused_rowset_monitor_thread_callback();

    // garbage sweep thread process function. clear snapshot and trash folder

    void _garbage_sweeper_thread_callback();

    // delete tablet with io error process function

    void _disk_stat_monitor_thread_callback();

    // path gc process function

    void _path_gc_thread_callback(DataDir* data_dir);

    void _tablet_path_check_callback();

    void _tablet_checkpoint_callback(const std::vector<DataDir*>& data_dirs);

    // parse the default rowset type config to RowsetTypePB

    void _parse_default_rowset_type();

    // Disk status monitoring. Monitoring unused_flag Road King's new corresponding root_path unused flag,

    // When the unused mark is detected, the corresponding table information is deleted from the memory, and the disk data does not move.

    // When the disk status is unusable, but the unused logo is not _push_tablet_into_submitted_compactiondetected, you need to download it from root_path

    // Reload the data.

    void _start_disk_stat_monitor();

    void _compaction_tasks_producer_callback();

    void _binlog_compaction_tasks_producer_callback();

    std::vector<TabletCompactionContext> _generate_compaction_tasks(

            CompactionType compaction_type, std::vector<DataDir*>& data_dirs, bool check_score);

    void _update_cumulative_compaction_policy();

    CumuCompactionPolicyTable _snapshot_cumulative_compaction_policy();

    std::shared_ptr<CumulativeCompactionPolicy> _get_cumulative_compaction_policy(

            std::string_view compaction_policy);

    void _pop_tablet_from_submitted_compaction(TabletSharedPtr tablet,

                                               CompactionType compaction_type);

    Status _submit_compaction_task(TabletSharedPtr tablet, CompactionType compaction_type,

                                   bool force, int trigger_method = 0);

    void _handle_compaction(TabletSharedPtr tablet, std::shared_ptr<CompactionMixin> compaction,

                            CompactionType compaction_type, int64_t permits, bool force,

                            int64_t compaction_id = 0);

    void _adjust_compaction_thread_num();

    void _cooldown_tasks_producer_callback();

    void _remove_unused_remote_files_callback();

    void do_remove_unused_remote_files();

    void _cold_data_compaction_producer_callback();

    void _handle_cold_data_compaction(TabletSharedPtr tablet);

    void _follow_cooldown_meta(TabletSharedPtr tablet);

    Status _handle_seg_compaction(std::shared_ptr<SegcompactionWorker> worker,

                                  SegCompactionCandidatesSharedPtr segments,

                                  uint64_t submission_time);

    Status _handle_index_change(IndexBuilderSharedPtr index_builder);

    void _gc_binlogs(int64_t tablet_id, int64_t version);

    void _async_publish_callback();

    void _process_async_publish();

    Status _persist_broken_paths();

    bool _increase_low_priority_task_nums(DataDir* dir);

    void _decrease_low_priority_task_nums(DataDir* dir);

    void _get_candidate_stores(TStorageMedium::type storage_medium,

                               std::vector<DirInfo>& dir_infos);

    int _get_and_set_next_disk_index(int64_t partition_id, TStorageMedium::type storage_medium);

    int32_t _auto_get_interval_by_disk_capacity(DataDir* data_dir);

    void _check_tablet_delete_bitmap_score_callback();

private:

    EngineOptions _options;

    std::mutex _store_lock;

    std::mutex _trash_sweep_lock;

    std::map<std::string, std::unique_ptr<DataDir>> _store_map;

    std::set<std::string> _broken_paths;

    std::mutex _broken_paths_mutex;

    uint32_t _available_storage_medium_type_count;

    bool _is_all_cluster_id_exist;

    std::atomic_bool _stopped {false};

    std::mutex _gc_mutex;

    std::unordered_map<RowsetId, RowsetSharedPtr> _unused_rowsets;

    // tablet_id, unused_rowsets, [start_version, end_version]

    std::vector<std::tuple<int64_t, std::vector<RowsetId>, DeleteBitmapKeyRanges>>

            _unused_delete_bitmap;

    PendingRowsetSet _pending_local_rowsets;

    PendingRowsetSet _pending_remote_rowsets;

    std::shared_ptr<Thread> _unused_rowset_monitor_thread;

    // thread to monitor snapshot expiry

    std::shared_ptr<Thread> _garbage_sweeper_thread;

    // thread to monitor disk stat

    std::shared_ptr<Thread> _disk_stat_monitor_thread;

    // thread to produce both base and cumulative compaction tasks

    std::shared_ptr<Thread> _compaction_tasks_producer_thread;

    std::shared_ptr<Thread> _binlog_compaction_tasks_producer_thread;

    std::shared_ptr<Thread> _cache_clean_thread;

    // threads to clean all file descriptor not actively in use

    std::vector<std::shared_ptr<Thread>> _path_gc_threads;

    // thread to produce tablet checkpoint tasks

    std::shared_ptr<Thread> _tablet_checkpoint_tasks_producer_thread;

    // thread to check tablet path

    std::shared_ptr<Thread> _tablet_path_check_thread;

    // thread to clean tablet lookup cache

    std::shared_ptr<Thread> _lookup_cache_clean_thread;

    std::mutex _engine_task_mutex;

    std::unique_ptr<TabletManager> _tablet_manager;

    std::unique_ptr<TxnManager> _txn_manager;

    // Used to control the migration from segment_v1 to segment_v2, can be deleted in futrue.

    // Type of new loaded data

    RowsetTypePB _default_rowset_type;

    std::unique_ptr<ThreadPool> _seg_compaction_thread_pool;

    std::unique_ptr<ThreadPool> _cold_data_compaction_thread_pool;

    std::unique_ptr<ThreadPool> _tablet_publish_txn_thread_pool;

    std::unique_ptr<ThreadPool> _tablet_meta_checkpoint_thread_pool;

    CompactionPermitLimiter _permit_limiter;

    CompactionSubmitRegistry _compaction_submit_registry;

    std::mutex _low_priority_task_nums_mutex;

    std::unordered_map<DataDir*, int32_t> _low_priority_task_nums;

    std::atomic<int32_t> _wakeup_producer_flag {0};

    std::mutex _compaction_producer_sleep_mutex;

    std::condition_variable _compaction_producer_sleep_cv;

    // we use unordered_map to store all cumulative compaction policy sharded ptr

    std::mutex _cumulative_compaction_policy_mtx;

    CumuCompactionPolicyTable _cumulative_compaction_policies;

    std::shared_ptr<Thread> _cooldown_tasks_producer_thread;

    std::shared_ptr<Thread> _remove_unused_remote_files_thread;

    std::shared_ptr<Thread> _cold_data_compaction_producer_thread;

    std::shared_ptr<Thread> _cache_file_cleaner_tasks_producer_thread;

    std::unique_ptr<PriorityThreadPool> _cooldown_thread_pool;

    std::mutex _running_cooldown_mutex;

    std::unordered_set<int64_t> _running_cooldown_tablets;

    std::mutex _cold_compaction_tablet_submitted_mtx;

    std::unordered_set<int64_t> _cold_compaction_tablet_submitted;

    std::mutex _cumu_compaction_delay_mtx;

    // tablet_id, publish_version, transaction_id, partition_id, commit_tso

    std::map<int64_t, std::map<int64_t, std::tuple<int64_t, int64_t, int64_t>>>

            _async_publish_tasks;

    // aync publish for discontinuous versions of merge_on_write table

    std::shared_ptr<Thread> _async_publish_thread;

    std::shared_mutex _async_publish_lock;

    std::atomic<bool> _need_clean_trash {false};

    // next index for create tablet

    std::map<TStorageMedium::type, int> _last_use_index;

    std::unique_ptr<CreateTabletRRIdxCache> _create_tablet_idx_lru_cache;

    std::unique_ptr<SnapshotManager> _snapshot_mgr;

    // thread to check tablet delete bitmap count tasks

    std::shared_ptr<Thread> _check_delete_bitmap_score_thread;

    int64_t _last_get_peers_replica_backends_time_ms {0};

    int64_t _compaction_num_per_round {1};

};

// lru cache for create tabelt round robin in disks

// key: partitionId_medium

// value: index

class CreateTabletRRIdxCache : public LRUCachePolicy {

public:

    // get key, delimiter with DELIMITER '-'

    static std::string get_key(int64_t partition_id, TStorageMedium::type medium) {

        return fmt::format("{}-{}", partition_id, medium);

    }

    // -1 not found key in lru

    int get_index(const std::string& key);

    void set_index(const std::string& key, int next_idx);

    class CacheValue : public LRUCacheValueBase {

    public:

        int idx = 0;

    };

    CreateTabletRRIdxCache(size_t capacity)

            : LRUCachePolicy(CachePolicy::CacheType::CREATE_TABLET_RR_IDX_CACHE, capacity,

                             LRUCacheType::NUMBER,

                             /*stale_sweep_time_s*/ 30 * 60, /*num shards*/ 1,

                             /*element count capacity */ 0,

                             /*enable prune*/ true, /*is lru-k*/ false) {}

};

struct DirInfo {

    DataDir* data_dir;

    double usage = 0;

    int available_level = 0;

    bool operator<(const DirInfo& other) const {

        if (available_level != other.available_level) {

            return available_level < other.available_level;

        }

        return data_dir->path_hash() < other.data_dir->path_hash();

    }

};

} // namespace doris