disagg: Add O11y on object store usage summary of each tiflash store

dbms/src/Common/TiFlashMetrics.cpp

@@ -73,6 +73,11 @@ TiFlashMetrics::TiFlashMetrics()
                                                    .Name("tiflash_storage_ru_read_bytes")
                                                    .Help("Read bytes for storage RU calculation")
                                                    .Register(*registry);
+
+    registered_s3_store_summary_bytes_family = &prometheus::BuildGauge()
+                                                    .Name("tiflash_storage_s3_store_summary_bytes")
+                                                    .Help("S3 storage summary bytes by store and file type")
+                                                    .Register(*registry);
 }
 
 void TiFlashMetrics::addReplicaSyncRU(UInt32 keyspace_id, UInt64 ru)
@@ -249,4 +254,37 @@ prometheus::Counter & TiFlashMetrics::getStorageRUReadBytesCounter(
         return counter;
     }
 }
+
+void TiFlashMetrics::setS3StoreSummaryBytes(UInt64 store_id, UInt64 data_file_bytes, UInt64 dt_file_bytes)
+{
+    // Fast path.
+    {
+        std::shared_lock lock(s3_store_summary_bytes_mtx);
+        auto it = registered_s3_store_summary_bytes_metrics.find(store_id);
+        if (it != registered_s3_store_summary_bytes_metrics.end())
+        {
+            it->second.data_file_bytes->Set(data_file_bytes);
+            it->second.dt_file_bytes->Set(dt_file_bytes);
+            return;
+        }
+    }
+
+    std::unique_lock lock(s3_store_summary_bytes_mtx);
+    auto [it, inserted] = registered_s3_store_summary_bytes_metrics.try_emplace(store_id);
+    if (inserted)
+    {
+        auto store_id_str = std::to_string(store_id);
+        auto & data_file_bytes_metric
+            = registered_s3_store_summary_bytes_family->Add({{"store_id", store_id_str}, {"type", "data_file_bytes"}});
+        auto & dt_file_bytes_metric
+            = registered_s3_store_summary_bytes_family->Add({{"store_id", store_id_str}, {"type", "dt_file_bytes"}});
+        it->second = S3StoreSummaryBytesMetrics{
+            .data_file_bytes = &data_file_bytes_metric,
+            .dt_file_bytes = &dt_file_bytes_metric,
+        };
+    }
+
+    it->second.data_file_bytes->Set(data_file_bytes);
+    it->second.dt_file_bytes->Set(dt_file_bytes);
+}
 } // namespace DB

dbms/src/Common/TiFlashMetrics.h

@@ -1326,6 +1326,8 @@ class TiFlashMetrics
         const String & resource_group,
         const DM::ReadRUType type);
 
+    void setS3StoreSummaryBytes(UInt64 store_id, UInt64 data_file_bytes, UInt64 dt_file_bytes);
+
 private:
     TiFlashMetrics();
 
@@ -1367,6 +1369,15 @@ class TiFlashMetrics
     // {keyspace}_{resource_group}_{type} -> Counter
     std::unordered_map<std::string, prometheus::Counter *> registered_storage_ru_read_bytes_metrics;
 
+    struct S3StoreSummaryBytesMetrics
+    {
+        prometheus::Gauge * data_file_bytes;
+        prometheus::Gauge * dt_file_bytes;
+    };
+    prometheus::Family<prometheus::Gauge> * registered_s3_store_summary_bytes_family;
+    std::shared_mutex s3_store_summary_bytes_mtx;
+    std::unordered_map<UInt64, S3StoreSummaryBytesMetrics> registered_s3_store_summary_bytes_metrics;
+
 public:
 #define MAKE_METRIC_MEMBER_M(family_name, help, type, ...) \
     MetricFamily<prometheus::type> family_name             \

dbms/src/Interpreters/Settings.h

@@ -240,6 +240,7 @@ struct Settings
     M(SettingBool, remote_checkpoint_only_upload_manifest, true, "Only upload manifest data when uploading checkpoint")                                                                                                                 \
     M(SettingInt64, remote_gc_method, 1, "The method of running GC task on the remote store. 1 - lifecycle, 2 - scan.")                                                                                                                 \
     M(SettingInt64, remote_gc_interval_seconds, 3600, "The interval of running GC task on the remote store. Unit is second.")                                                                                                           \
+    M(SettingInt64, remote_summary_interval_seconds, 0, "The interval of collecting remote S3 storage summary. Unit is second. <=0 disables periodic summary task.")                                                        \
     M(SettingInt64, remote_gc_verify_consistency, 0, "[testing] Verify the consistenct of valid locks when doing GC")                                                                                                                   \
     M(SettingInt64, remote_gc_min_age_seconds, 3600, "The file will NOT be compacted when the time difference between the last modification is less than this threshold")                                                               \
     M(SettingDouble, remote_gc_ratio, 0.5, "The files with valid rate less than this threshold will be compacted")                                                                                                                      \

dbms/src/Storages/KVStore/TMTContext.cpp

@@ -222,6 +222,7 @@ void TMTContext::initS3GCManager(const TiFlashRaftProxyHelper * proxy_helper)
         }
         // TODO: make it reloadable
         remote_gc_config.interval_seconds = context.getSettingsRef().remote_gc_interval_seconds;
+        remote_gc_config.summary_interval_seconds = context.getSettingsRef().remote_summary_interval_seconds;
         remote_gc_config.verify_locks = context.getSettingsRef().remote_gc_verify_consistency > 0;
         // set the gc_method so that S3LockService can set tagging when create delmark
         S3::ClientFactory::instance().gc_method = remote_gc_config.method;

dbms/src/Storages/S3/S3GCManager.cpp

@@ -224,6 +224,11 @@ bool S3GCManager::runOnAllStores()
     return false;
 }
 
+bool S3GCManager::isOwner() const
+{
+    return gc_owner_manager->isOwner();
+}
+
 void S3GCManager::runForStore(UInt64 gc_store_id, LoggerPtr slogger)
 {
     // get a timepoint at the begin, only remove objects that expired compare
@@ -858,6 +863,17 @@ S3StoreStorageSummary S3GCManager::getStoreStorageSummary(StoreID store_id)
     String last_dtfile_key;
     size_t num_dtfile_keys_for_last_dtfile = 0;
     S3::listPrefix(*client, prefix, [&](const Aws::S3::Model::Object & object) {
+        if (shutdown_called)
+        {
+            LOG_INFO(
+                log,
+                "getS3StorageSummary shutting down, break, store_id={} processed_keys={}",
+                store_id,
+                num_processed_keys);
+            // .more=false to break the listing early
+            return PageResult{.num_keys = 1, .more = false};
+        }
+
         const auto & key = object.GetKey();
         const auto view = S3FilenameView::fromKey(key);
         if (watch.elapsedSeconds() - last_elapsed > log_interval_seconds)
@@ -931,6 +947,7 @@ S3StoreStorageSummary S3GCManager::getStoreStorageSummary(StoreID store_id)
         return PageResult{.num_keys = 1, .more = true};
     });
     summary.num_keys = num_processed_keys;
+    TiFlashMetrics::instance().setS3StoreSummaryBytes(store_id, summary.data_file.bytes, summary.dt_file.bytes);
     LOG_INFO(log, "getS3StorageSummary finish, elapsed={:.3f}s summary={}", watch.elapsedSeconds(), summary);
     return summary;
 }
@@ -956,6 +973,49 @@ S3GCManagerService::S3GCManagerService(
         [this]() { return manager->runOnAllStores(); },
         false,
         /*interval_ms*/ config.interval_seconds * 1000);
+
+    if (config.summary_interval_seconds <= 0)
+    {
+        LOG_INFO(
+            Logger::get("S3GCManagerService"),
+            "The periodic S3 storage summary will be disabled, summary_interval_seconds={}",
+            config.summary_interval_seconds);
+    }
+    else
+    {
+        if (config.summary_interval_seconds < 12 * 3600)
+        {
+            LOG_WARNING(
+                Logger::get("S3GCManagerService"),
+                "The summary_interval_seconds is too small, it may cause high overhead on S3. "
+                "It is recommended to set it to a value larger than 12 hours (43200 seconds), "
+                "summary_interval_seconds={}",
+                config.summary_interval_seconds);
+        }
+
+        summary_timer = global_ctx.getBackgroundPool().addTask(
+            [this]() {
+                // Only run summary in the owner instance
+                if (!manager || !manager->isOwner())
+                    return false;
+
+                try
+                {
+                    auto summary = manager->getS3StorageSummary({});
+                    LOG_INFO(
+                        Logger::get("S3GCManagerService"),
+                        "Periodic S3 storage summary finished, num_stores={}",
+                        summary.stores.size());
+                }
+                catch (...)
+                {
+                    tryLogCurrentException(Logger::get("S3GCManagerService"), "periodic getS3StorageSummary failed");
+                }
+                return false;
+            },
+            false,
+            config.summary_interval_seconds * 1000);
+    }
 }
 
 S3GCManagerService::~S3GCManagerService()
@@ -976,9 +1036,16 @@ void S3GCManagerService::shutdown()
         // Remove the task handler. It will block until the task break
         global_ctx.getBackgroundPool().removeTask(timer);
         timer = nullptr;
-        // then we can reset the manager
-        manager = nullptr;
     }
+
+    if (summary_timer)
+    {
+        global_ctx.getBackgroundPool().removeTask(summary_timer);
+        summary_timer = nullptr;
+    }
+
+    // then we can reset the manager
+    manager = nullptr;
 }
 
 void S3GCManagerService::wake() const

dbms/src/Storages/S3/S3GCManager.h

@@ -72,6 +72,9 @@ struct S3GCConfig
     // The interval of the S3 GC routine runs
     Int64 interval_seconds = 600;
 
+    // The interval of periodic S3 storage summary task.
+    Int64 summary_interval_seconds = 24 * 60 * 60;
+
     // The maximum number of manifest files preserve
     // for each store
     size_t manifest_preserve_count = 10;
@@ -144,6 +147,8 @@ class S3GCManager
 
     bool runOnAllStores();
 
+    bool isOwner() const;
+
     void shutdown() { shutdown_called = true; }
 
     S3StoreStorageSummary getStoreStorageSummary(StoreID store_id);
@@ -234,6 +239,7 @@ class S3GCManagerService
     Context & global_ctx;
     std::unique_ptr<S3GCManager> manager;
     BackgroundProcessingPool::TaskHandle timer;
+    BackgroundProcessingPool::TaskHandle summary_timer;
 };
 
 } // namespace DB::S3