chore: retire TEST_EnableHeartBeat (#3435)

Now unit tests will run the same Hearbeat fiber like in prod.
The whole feature was redundant, with just few explicit settings of maxmemory_limit
I succeeeded to make all unit tests pass.

In addition, this change allows passing a global handler that is called by heartbeat from a single thread.
This is not used yet - preparation for the next PR to break hung up replication connections on a master.

Finally, this change has some non-functional clean-ups and warning fixes to improve code quality.

Signed-off-by: Roman Gershman <roman@dragonflydb.io>

src/facade/dragonfly_connection.cc

@@ -897,7 +897,7 @@ void Connection::ConnectionFlow(FiberSocketBase* peer) {
   ClearPipelinedMessages();
   DCHECK(dispatch_q_.empty());
 
-  service_->OnClose(cc_.get());
+  service_->OnConnectionClose(cc_.get());
   DecreaseStatsOnClose();
 
   // We wait for dispatch_fb to finish writing the previous replies before replying to the last

src/facade/service_interface.h

@@ -39,7 +39,7 @@ class ServiceInterface {
   virtual void ConfigureHttpHandlers(util::HttpListenerBase* base, bool is_privileged) {
   }
 
-  virtual void OnClose(ConnectionContext* cntx) {
+  virtual void OnConnectionClose(ConnectionContext* cntx) {
   }
 
   struct ContextInfo {

src/server/blocking_controller_test.cc

@@ -52,7 +52,7 @@ void BlockingControllerTest::SetUp() {
   });
 
   shard_set = new EngineShardSet(pp_.get());
-  shard_set->Init(kNumThreads, false);
+  shard_set->Init(kNumThreads, nullptr);
 
   trans_.reset(new Transaction{&cid_});
 

src/server/container_utils.cc

@@ -116,7 +116,7 @@ OpResult<ShardFFResult> FindFirstNonEmpty(Transaction* trans, int req_obj_type)
     return OpStatus::WRONG_TYPE;
 
   // Order result by their keys position in the command arguments, push errors to back
-  auto comp = [trans](const OpResult<FFResult>& lhs, const OpResult<FFResult>& rhs) {
+  auto comp = [](const OpResult<FFResult>& lhs, const OpResult<FFResult>& rhs) {
     if (!lhs || !rhs)
       return lhs.ok();
     size_t i1 = std::get<1>(*lhs);

src/server/debugcmd.cc

@@ -928,6 +928,7 @@ void DebugCmd::Stacktrace() {
     std::unique_lock lk(m);
     fb2::detail::FiberInterface::PrintAllFiberStackTraces();
   });
+  base::FlushLogs();
   cntx_->SendOk();
 }
 

src/server/dfly_main.cc

@@ -186,8 +186,6 @@ bool RunEngine(ProactorPool* pool, AcceptServer* acceptor) {
     listeners.push_back(listener.release());
   }
 
-  Service::InitOpts opts;
-  opts.disable_time_update = false;
   const auto& bind = GetFlag(FLAGS_bind);
   const char* bind_addr = bind.empty() ? nullptr : bind.c_str();
 
@@ -292,7 +290,7 @@ bool RunEngine(ProactorPool* pool, AcceptServer* acceptor) {
     listeners.push_back(listener.release());
   }
 
-  service.Init(acceptor, listeners, opts);
+  service.Init(acceptor, listeners);
 
   VersionMonitor version_monitor;
 

src/server/dflycmd.cc

@@ -660,7 +660,7 @@ std::vector<ReplicaRoleInfo> DflyCmd::GetReplicasRoleInfo() const {
   lock_guard lk(mu_);
 
   vec.reserve(replica_infos_.size());
-  auto replication_lags = ReplicationLags();
+  auto replication_lags = ReplicationLagsLocked();
 
   for (const auto& [id, info] : replica_infos_) {
     LSN lag = replication_lags[id];
@@ -712,14 +712,13 @@ void DflyCmd::GetReplicationMemoryStats(ReplicationMemoryStats* stats) const {
 
 pair<uint32_t, shared_ptr<DflyCmd::ReplicaInfo>> DflyCmd::GetReplicaInfoOrReply(
     std::string_view id_str, RedisReplyBuilder* rb) {
-  unique_lock lk(mu_);
-
   uint32_t sync_id;
   if (!ToSyncId(id_str, &sync_id)) {
     rb->SendError(kInvalidSyncId);
     return {0, nullptr};
   }
 
+  lock_guard lk(mu_);
   auto sync_it = replica_infos_.find(sync_id);
   if (sync_it == replica_infos_.end()) {
     rb->SendError(kIdNotFound);
@@ -729,7 +728,7 @@ pair<uint32_t, shared_ptr<DflyCmd::ReplicaInfo>> DflyCmd::GetReplicaInfoOrReply(
   return {sync_id, sync_it->second};
 }
 
-std::map<uint32_t, LSN> DflyCmd::ReplicationLags() const {
+std::map<uint32_t, LSN> DflyCmd::ReplicationLagsLocked() const {
   DCHECK(!mu_.try_lock());  // expects to be under global lock
   if (replica_infos_.empty())
     return {};
@@ -785,9 +784,6 @@ bool DflyCmd::CheckReplicaStateOrReply(const ReplicaInfo& repl_info, SyncState e
   return true;
 }
 
-void DflyCmd::BreakOnShutdown() {
-}
-
 void DflyCmd::Shutdown() {
   ReplicaInfoMap pending;
   {

src/server/dflycmd.h

@@ -132,8 +132,6 @@ class DflyCmd {
 
   void OnClose(ConnectionContext* cntx);
 
-  void BreakOnShutdown();
-
   // Stop all background processes so we can exit in orderly manner.
   void Shutdown();
 
@@ -214,17 +212,17 @@ class DflyCmd {
   bool CheckReplicaStateOrReply(const ReplicaInfo& ri, SyncState expected,
                                 facade::RedisReplyBuilder* rb);
 
+ private:
   // Return a map between replication ID to lag. lag is defined as the maximum of difference
   // between the master's LSN and the last acknowledged LSN in over all shards.
-  std::map<uint32_t, LSN> ReplicationLags() const;
+  std::map<uint32_t, LSN> ReplicationLagsLocked() const;
 
- private:
   ServerFamily* sf_;  // Not owned
 
   uint32_t next_sync_id_ = 1;
 
   using ReplicaInfoMap = absl::btree_map<uint32_t, std::shared_ptr<ReplicaInfo>>;
-  ReplicaInfoMap replica_infos_;
+  ReplicaInfoMap replica_infos_ ABSL_GUARDED_BY(mu_);
 
   mutable util::fb2::Mutex mu_;  // Guard global operations. See header top for locking levels.
 };

src/server/dragonfly_test.cc

@@ -402,7 +402,6 @@ TEST_F(DflyEngineTest, FlushAll) {
 }
 
 TEST_F(DflyEngineTest, OOM) {
-  shard_set->TEST_EnableHeartBeat();
   max_memory_limit = 300000;
   size_t i = 0;
   RespExpr resp;
@@ -444,7 +443,6 @@ TEST_F(DflyEngineTest, OOM) {
 /// and then written with the same key.
 TEST_F(DflyEngineTest, Bug207) {
   max_memory_limit = 300000;
-  shard_set->TEST_EnableHeartBeat();
   shard_set->TEST_EnableCacheMode();
   absl::FlagSaver fs;
   absl::SetFlag(&FLAGS_oom_deny_ratio, 4);
@@ -474,7 +472,6 @@ TEST_F(DflyEngineTest, Bug207) {
 }
 
 TEST_F(DflyEngineTest, StickyEviction) {
-  shard_set->TEST_EnableHeartBeat();
   shard_set->TEST_EnableCacheMode();
   absl::FlagSaver fs;
   absl::SetFlag(&FLAGS_oom_deny_ratio, 4);
@@ -583,11 +580,7 @@ TEST_F(DflyEngineTest, Bug468) {
 }
 
 TEST_F(DflyEngineTest, Bug496) {
-  shard_set->pool()->AwaitFiberOnAll([&](unsigned index, ProactorBase* base) {
-    EngineShard* shard = EngineShard::tlocal();
-    if (shard == nullptr)
-      return;
-
+  shard_set->RunBlockingInParallel([](EngineShard* shard) {
     auto& db = namespaces.GetDefaultNamespace().GetDbSlice(shard->shard_id());
 
     int cb_hits = 0;

src/server/engine_shard_set.cc

@@ -406,14 +406,15 @@ void EngineShard::StopPeriodicFiber() {
   }
 }
 
-void EngineShard::StartPeriodicFiber(util::ProactorBase* pb) {
+void EngineShard::StartPeriodicFiber(util::ProactorBase* pb, std::function<void()> global_handler) {
   uint32_t clock_cycle_ms = 1000 / std::max<uint32_t>(1, GetFlag(FLAGS_hz));
   if (clock_cycle_ms == 0)
     clock_cycle_ms = 1;
 
-  fiber_periodic_ = MakeFiber([this, index = pb->GetPoolIndex(), period_ms = clock_cycle_ms] {
+  fiber_periodic_ = MakeFiber([this, index = pb->GetPoolIndex(), period_ms = clock_cycle_ms,
+                               handler = std::move(global_handler)] {
     ThisFiber::SetName(absl::StrCat("shard_periodic", index));
-    RunPeriodic(std::chrono::milliseconds(period_ms));
+    RunPeriodic(std::chrono::milliseconds(period_ms), std::move(handler));
   });
 }
 
@@ -671,7 +672,8 @@ void EngineShard::Heartbeat() {
   }
 }
 
-void EngineShard::RunPeriodic(std::chrono::milliseconds period_ms) {
+void EngineShard::RunPeriodic(std::chrono::milliseconds period_ms,
+                              std::function<void()> global_handler) {
   VLOG(1) << "RunPeriodic with period " << period_ms.count() << "ms";
 
   bool runs_global_periodic = (shard_id() == 0);  // Only shard 0 runs global periodic.
@@ -716,6 +718,10 @@ void EngineShard::RunPeriodic(std::chrono::milliseconds period_ms) {
               rss_mem_peak.store(total_rss, memory_order_relaxed);
           }
         }
+
+        if (global_handler) {
+          global_handler();
+        }
       }
     }
   }
@@ -762,12 +768,6 @@ size_t EngineShard::UsedMemory() const {
          search_indices()->GetUsedMemory();
 }
 
-void EngineShard::TEST_EnableHeartbeat() {
-  fiber_periodic_ = fb2::Fiber("shard_periodic_TEST", [this, period_ms = 1] {
-    RunPeriodic(std::chrono::milliseconds(period_ms));
-  });
-}
-
 bool EngineShard::ShouldThrottleForTiering() const {  // see header for formula justification
   if (!tiered_storage_)
     return false;
@@ -902,7 +902,7 @@ size_t GetTieredFileLimit(size_t threads) {
   return max_shard_file_size;
 }
 
-void EngineShardSet::Init(uint32_t sz, bool update_db_time) {
+void EngineShardSet::Init(uint32_t sz, std::function<void()> global_handler) {
   CHECK_EQ(0u, size());
   shard_queue_.resize(sz);
 
@@ -920,10 +920,8 @@ void EngineShardSet::Init(uint32_t sz, bool update_db_time) {
       auto* shard = EngineShard::tlocal();
       shard->InitTieredStorage(pb, max_shard_file_size);
 
-      if (update_db_time) {
-        // Must be last, as it accesses objects initialized above.
-        shard->StartPeriodicFiber(pb);
-      }
+      // Must be last, as it accesses objects initialized above.
+      shard->StartPeriodicFiber(pb, global_handler);
     }
   });
 }
@@ -949,10 +947,6 @@ void EngineShardSet::InitThreadLocal(ProactorBase* pb) {
   shard_queue_[es->shard_id()] = es->GetFiberQueue();
 }
 
-void EngineShardSet::TEST_EnableHeartBeat() {
-  RunBriefInParallel([](EngineShard* shard) { shard->TEST_EnableHeartbeat(); });
-}
-
 void EngineShardSet::TEST_EnableCacheMode() {
   RunBlockingInParallel([](EngineShard* shard) {
     namespaces.GetDefaultNamespace().GetCurrentDbSlice().TEST_EnableCacheMode();

src/server/engine_shard_set.h

@@ -150,8 +150,6 @@ class EngineShard {
     return continuation_trans_;
   }
 
-  void TEST_EnableHeartbeat();
-
   void StopPeriodicFiber();
 
   struct TxQueueInfo {
@@ -205,10 +203,10 @@ class EngineShard {
   // blocks the calling fiber.
   void Shutdown();  // called before destructing EngineShard.
 
-  void StartPeriodicFiber(util::ProactorBase* pb);
+  void StartPeriodicFiber(util::ProactorBase* pb, std::function<void()> global_handler);
 
   void Heartbeat();
-  void RunPeriodic(std::chrono::milliseconds period_ms);
+  void RunPeriodic(std::chrono::milliseconds period_ms, std::function<void()> global_handler);
 
   void CacheStats();
 
@@ -288,7 +286,7 @@ class EngineShardSet {
     return pp_;
   }
 
-  void Init(uint32_t size, bool update_db_time);
+  void Init(uint32_t size, std::function<void()> global_handler);
 
   // Shutdown sequence:
   // - EngineShardSet.PreShutDown()
@@ -342,7 +340,6 @@ class EngineShardSet {
   }
 
   // Used in tests
-  void TEST_EnableHeartBeat();
   void TEST_EnableCacheMode();
 
  private:

src/server/main_service.cc

@@ -842,8 +842,7 @@ Service::~Service() {
   shard_set = nullptr;
 }
 
-void Service::Init(util::AcceptServer* acceptor, std::vector<facade::Listener*> listeners,
-                   const InitOpts& opts) {
+void Service::Init(util::AcceptServer* acceptor, std::vector<facade::Listener*> listeners) {
   InitRedisTables();
 
   config_registry.RegisterMutable("maxmemory", [](const absl::CommandLineFlag& flag) {
@@ -881,7 +880,7 @@ void Service::Init(util::AcceptServer* acceptor, std::vector<facade::Listener*>
     ServerState::Init(index, shard_num, &user_registry_);
   });
 
-  shard_set->Init(shard_num, !opts.disable_time_update);
+  shard_set->Init(shard_num, nullptr);
   const auto tcp_disabled = GetFlag(FLAGS_port) == 0u;
   // We assume that listeners.front() is the main_listener
   // see dfly_main RunEngine
@@ -1600,10 +1599,9 @@ facade::ConnectionContext* Service::CreateContext(util::FiberSocketBase* peer,
 
   // a bit of a hack. I set up breaker callback here for the owner.
   // Should work though it's confusing to have it here.
-  owner->RegisterBreakHook([res, this](uint32_t) {
+  owner->RegisterBreakHook([res](uint32_t) {
     if (res->transaction)
       res->transaction->CancelBlocking(nullptr);
-    this->server_family().BreakOnShutdown();
   });
 
   return res;
@@ -2529,7 +2527,7 @@ void Service::ConfigureHttpHandlers(util::HttpListenerBase* base, bool is_privil
   }
 }
 
-void Service::OnClose(facade::ConnectionContext* cntx) {
+void Service::OnConnectionClose(facade::ConnectionContext* cntx) {
   ConnectionContext* server_cntx = static_cast<ConnectionContext*>(cntx);
   ConnectionState& conn_state = server_cntx->conn_state;
 

src/server/main_service.h

@@ -29,18 +29,10 @@ using facade::MemcacheParser;
 
 class Service : public facade::ServiceInterface {
  public:
-  struct InitOpts {
-    bool disable_time_update;
-
-    InitOpts() : disable_time_update{false} {
-    }
-  };
-
   explicit Service(util::ProactorPool* pp);
   ~Service();
 
-  void Init(util::AcceptServer* acceptor, std::vector<facade::Listener*> listeners,
-            const InitOpts& opts = InitOpts{});
+  void Init(util::AcceptServer* acceptor, std::vector<facade::Listener*> listeners);
 
   void Shutdown();
 
@@ -93,7 +85,7 @@ class Service : public facade::ServiceInterface {
   GlobalState GetGlobalState() const;
 
   void ConfigureHttpHandlers(util::HttpListenerBase* base, bool is_privileged) final;
-  void OnClose(facade::ConnectionContext* cntx) final;
+  void OnConnectionClose(facade::ConnectionContext* cntx) final;
 
   Service::ContextInfo GetContextInfo(facade::ConnectionContext* cntx) const final;
 

src/server/rdb_save.cc

@@ -835,7 +835,7 @@ error_code SerializerBase::WriteRaw(const io::Bytes& buf) {
   return error_code{};
 }
 
-error_code SerializerBase::FlushToSink(io::Sink* s, SerializerBase::FlushState flush_state) {
+error_code SerializerBase::FlushToSink(io::Sink* sink, SerializerBase::FlushState flush_state) {
   auto bytes = PrepareFlush(flush_state);
   if (bytes.empty())
     return error_code{};
@@ -843,7 +843,7 @@ error_code SerializerBase::FlushToSink(io::Sink* s, SerializerBase::FlushState f
   DVLOG(2) << "FlushToSink " << bytes.size() << " bytes";
 
   // interrupt point.
-  RETURN_ON_ERR(s->Write(bytes));
+  RETURN_ON_ERR(sink->Write(bytes));
   mem_buf_.ConsumeInput(bytes.size());
 
   return error_code{};
@@ -1121,7 +1121,9 @@ class RdbSaver::Impl {
 
   RdbSaver::SnapshotStats GetCurrentSnapshotProgress() const;
 
-  error_code Flush() {
+  error_code FlushSerializer();
+
+  error_code FlushSink() {
     return aligned_buf_ ? aligned_buf_->Flush() : error_code{};
   }
 
@@ -1133,10 +1135,6 @@ class RdbSaver::Impl {
     return &meta_serializer_;
   }
 
-  io::Sink* sink() {
-    return sink_;
-  }
-
  private:
   unique_ptr<SliceSnapshot>& GetSnapshot(EngineShard* shard);
 
@@ -1252,6 +1250,7 @@ error_code RdbSaver::Impl::ConsumeChannel(const Cancellation* cll) {
   std::optional<SliceSnapshot::DbRecord> record;
 
   RecordsPopper records_popper(push_to_sink_with_order_, &channel_);
+  auto& stats = ServerState::tlocal()->stats;
 
   // we can not exit on io-error since we spawn fibers that push data.
   // TODO: we may signal them to stop processing and exit asap in case of the error.
@@ -1266,10 +1265,10 @@ error_code RdbSaver::Impl::ConsumeChannel(const Cancellation* cll) {
       DVLOG(2) << "Pulled " << record->id;
       auto before = absl::GetCurrentTimeNanos();
       io_error = sink_->Write(io::Buffer(record->value));
-      auto& stats = ServerState::tlocal()->stats;
       stats.rdb_save_usec += (absl::GetCurrentTimeNanos() - before) / 1'000;
       stats.rdb_save_count++;
       if (io_error) {
+        VLOG(1) << "Error writing to sink " << io_error.message();
         break;
       }
     } while ((record = records_popper.TryPop()));
@@ -1369,6 +1368,10 @@ RdbSaver::SnapshotStats RdbSaver::Impl::GetCurrentSnapshotProgress() const {
       });
 }
 
+error_code RdbSaver::Impl::FlushSerializer() {
+  return serializer()->FlushToSink(sink_, SerializerBase::FlushState::kFlushMidEntry);
+}
+
 RdbSaver::GlobalData RdbSaver::GetGlobalData(const Service* service) {
   StringVec script_bodies, search_indices;
 
@@ -1471,8 +1474,7 @@ error_code RdbSaver::SaveHeader(const GlobalData& glob_state) {
 }
 
 error_code RdbSaver::SaveBody(Context* cntx, RdbTypeFreqMap* freq_map) {
-  RETURN_ON_ERR(
-      impl_->serializer()->FlushToSink(impl_->sink(), SerializerBase::FlushState::kFlushMidEntry));
+  RETURN_ON_ERR(impl_->FlushSerializer());
 
   if (save_mode_ == SaveMode::SUMMARY) {
     impl_->serializer()->SendFullSyncCut();
@@ -1547,9 +1549,9 @@ error_code RdbSaver::SaveEpilog() {
   absl::little_endian::Store64(buf, chksum);
   RETURN_ON_ERR(ser.WriteRaw(buf));
 
-  RETURN_ON_ERR(ser.FlushToSink(impl_->sink(), SerializerBase::FlushState::kFlushMidEntry));
+  RETURN_ON_ERR(impl_->FlushSerializer());
 
-  return impl_->Flush();
+  return impl_->FlushSink();
 }
 
 error_code RdbSaver::SaveAuxFieldStrInt(string_view key, int64_t val) {

src/server/rdb_save.h

@@ -86,7 +86,7 @@ class RdbSaver {
   ~RdbSaver();
 
   // Initiates the serialization in the shard's thread.
-  // TODO: to implement break functionality to allow stopping early.
+  // cll allows breaking in the middle.
   void StartSnapshotInShard(bool stream_journal, const Cancellation* cll, EngineShard* shard);
 
   // Send only the incremental snapshot since start_lsn.

src/server/rdb_test.cc

@@ -45,6 +45,7 @@ class RdbTest : public BaseFamilyTest {
 
 void RdbTest::SetUp() {
   InitWithDbFilename();
+  max_memory_limit = 40000000;
 }
 
 inline const uint8_t* to_byte(const void* s) {

src/server/search/search_family_test.cc

@@ -628,8 +628,6 @@ TEST_F(SearchFamilyTest, SimpleExpiry) {
 
   EXPECT_THAT(Run({"ft.search", "i1", "*"}), AreDocIds("d:1", "d:2", "d:3"));
 
-  shard_set->TEST_EnableHeartBeat();
-
   AdvanceTime(60);
   ThisFiber::SleepFor(5ms);  // Give heartbeat time to delete expired doc
   EXPECT_THAT(Run({"ft.search", "i1", "*"}), AreDocIds("d:1", "d:3"));

src/server/server_family.cc

@@ -683,7 +683,7 @@ std::optional<fb2::Fiber> Pause(std::vector<facade::Listener*> listeners, Namesp
   //    command that did not pause on the new state yet we will pause after waking up.
   DispatchTracker tracker{std::move(listeners), conn, true /* ignore paused commands */,
                           true /*ignore blocking*/};
-  shard_set->pool()->AwaitBrief([&tracker, pause_state, ns](unsigned, util::ProactorBase*) {
+  shard_set->pool()->AwaitBrief([&tracker, pause_state](unsigned, util::ProactorBase*) {
     // Commands don't suspend before checking the pause state, so
     // it's impossible to deadlock on waiting for a command that will be paused.
     tracker.TrackOnThread();
@@ -1562,10 +1562,6 @@ void ServerFamily::DbSize(CmdArgList args, ConnectionContext* cntx) {
   return cntx->SendLong(num_keys.load(memory_order_relaxed));
 }
 
-void ServerFamily::BreakOnShutdown() {
-  dfly_cmd_->BreakOnShutdown();
-}
-
 void ServerFamily::CancelBlockingOnThread(std::function<OpStatus(ArgSlice)> status_cb) {
   auto cb = [status_cb](unsigned thread_index, util::Connection* conn) {
     if (auto fcntx = static_cast<facade::Connection*>(conn)->cntx(); fcntx) {

src/server/server_family.h

@@ -227,8 +227,6 @@ class ServerFamily {
 
   void OnClose(ConnectionContext* cntx);
 
-  void BreakOnShutdown();
-
   void CancelBlockingOnThread(std::function<facade::OpStatus(ArgSlice)> = {});
 
   // Sets the server to replicate another instance. Does not flush the database beforehand!

src/server/test_utils.cc

@@ -167,10 +167,10 @@ void BaseFamilyTest::SetUpTestSuite() {
       SetTestFlag(flag, value);
     }
   }
-  max_memory_limit = INT_MAX;
 }
 
 void BaseFamilyTest::SetUp() {
+  max_memory_limit = INT_MAX;
   ResetService();
 }
 
@@ -207,9 +207,7 @@ void BaseFamilyTest::ResetService() {
   pp_->Run();
   service_ = std::make_unique<Service>(pp_.get());
 
-  Service::InitOpts opts;
-  opts.disable_time_update = true;
-  service_->Init(nullptr, {}, opts);
+  service_->Init(nullptr, {});
   used_mem_current = 0;
 
   TEST_current_time_ms = absl::GetCurrentTimeNanos() / 1000000;

src/server/tiered_storage.cc

@@ -192,7 +192,7 @@ void TieredStorage::ShardOpManager::Defragment(tiering::DiskSegment segment, str
   for (auto [dbid, hash, item_segment] : ts_->bins_->DeleteBin(segment, page)) {
     // Search for key with the same hash and value pointing to the same segment.
     // If it still exists, it must correspond to the value stored in this bin
-    auto predicate = [item_segment](const PrimeKey& key, const PrimeValue& probe) {
+    auto predicate = [item_segment = item_segment](const PrimeKey& key, const PrimeValue& probe) {
       return probe.IsExternal() && tiering::DiskSegment{probe.GetExternalSlice()} == item_segment;
     };
     auto it = db_slice_.GetDBTable(dbid)->prime.FindFirst(hash, predicate);

src/server/tiered_storage_test.cc

@@ -209,7 +209,6 @@ TEST_F(TieredStorageTest, BackgroundOffloading) {
   const int kNum = 500;
 
   max_memory_limit = kNum * 4096;
-  pp_->at(0)->AwaitBrief([] { EngineShard::tlocal()->TEST_EnableHeartbeat(); });
 
   // Stash all values
   string value = BuildString(3000);
@@ -302,10 +301,7 @@ TEST_F(TieredStorageTest, FlushPending) {
 
 TEST_F(TieredStorageTest, MemoryPressure) {
   max_memory_limit = 20_MB;
-  pp_->at(0)->AwaitBrief([] {
-    EngineShard::tlocal()->TEST_EnableHeartbeat();
-    EngineShard::tlocal()->tiered_storage()->SetMemoryLowLimit(2_MB);
-  });
+  pp_->at(0)->AwaitBrief([] { EngineShard::tlocal()->tiered_storage()->SetMemoryLowLimit(2_MB); });
 
   constexpr size_t kNum = 10000;
   for (size_t i = 0; i < kNum; i++) {