feat:thread purge

conf/pika.conf

@@ -27,6 +27,11 @@ thread-num : 1
 # are dedicated to handling user requests.
 thread-pool-size : 12
 
+# This parameter is used to control whether to separate fast and slow commands.
+# When slow-cmd-pool is set to yes, fast and slow commands are separated.
+# When set to no, they are not separated.
+slow-cmd-pool : no
+
 # Size of the low level thread pool, The threads within this pool
 # are dedicated to handling slow user requests.
 slow-cmd-thread-pool-size : 1

include/pika_client_processor.h

@@ -19,12 +19,10 @@ class PikaClientProcessor {
   int Start();
   void Stop();
   void SchedulePool(net::TaskFunc func, void* arg);
-  void ScheduleBgThreads(net::TaskFunc func, void* arg, const std::string& hash_str);
   size_t ThreadPoolCurQueueSize();
   size_t ThreadPoolMaxQueueSize();
 
  private:
   std::unique_ptr<net::ThreadPool> pool_;
-  std::vector<std::unique_ptr<net::BGThread>> bg_threads_;
 };
 #endif  // PIKA_CLIENT_PROCESSOR_H_

include/pika_conf.h

@@ -186,6 +186,10 @@ class PikaConf : public pstd::BaseConf {
     std::shared_lock l(rwlock_);
     return slotmigrate_;
   }
+  bool slow_cmd_pool() {
+    std::shared_lock l(rwlock_);
+    return slow_cmd_pool_;
+  }
   std::string server_id() {
     std::shared_lock l(rwlock_);
     return server_id_;
@@ -574,6 +578,11 @@ class PikaConf : public pstd::BaseConf {
     TryPushDiffCommands("slotmigrate", value ? "yes" : "no");
     slotmigrate_.store(value);
   }
+  void SetSlowCmdPool(const bool value) {
+    std::lock_guard l(rwlock_);
+    TryPushDiffCommands("slow-cmd-pool", value ? "yes" : "no");
+    slow_cmd_pool_.store(value);
+  }
   void SetSlotMigrateThreadNum(const int value) {
     std::lock_guard l(rwlock_);
     TryPushDiffCommands("slotmigrate-thread-num", std::to_string(value));
@@ -844,6 +853,7 @@ class PikaConf : public pstd::BaseConf {
   std::string bgsave_path_;
   std::string bgsave_prefix_;
   std::string pidfile_;
+  std::atomic<bool> slow_cmd_pool_;
 
   std::string compression_;
   std::string compression_per_level_;

include/pika_server.h

@@ -95,6 +95,7 @@ class PikaServer : public pstd::noncopyable {
   bool force_full_sync();
   void SetForceFullSync(bool v);
   void SetDispatchQueueLimit(int queue_limit);
+  void SetSlowCmdThreadPoolFlag(bool flag);
   storage::StorageOptions storage_options();
   std::unique_ptr<PikaDispatchThread>& pika_dispatch_thread() {
     return pika_dispatch_thread_;
@@ -168,7 +169,6 @@ class PikaServer : public pstd::noncopyable {
   void FinishMetaSync();
   bool MetaSyncDone();
   void ResetMetaSyncStatus();
-  void SetLoopDBStateMachine(bool need_loop);
   int GetMetaSyncTimestamp();
   void UpdateMetaSyncTimestamp();
   void UpdateMetaSyncTimestampWithoutLock();
@@ -179,7 +179,7 @@ class PikaServer : public pstd::noncopyable {
    * PikaClientProcessor Process Task
    */
   void ScheduleClientPool(net::TaskFunc func, void* arg, bool is_slow_cmd);
-  void ScheduleClientBgThreads(net::TaskFunc func, void* arg, const std::string& hash_str);
+
   // for info debug
   size_t ClientProcessorThreadPoolCurQueueSize();
   size_t ClientProcessorThreadPoolMaxQueueSize();
@@ -642,6 +642,11 @@ class PikaServer : public pstd::noncopyable {
    * acl
    */
   std::unique_ptr<::Acl> acl_ = nullptr;
+
+  /*
+   * fast and slow thread pools
+   */
+  bool slow_cmd_thread_pool_flag_;
 };
 
 #endif

src/net/src/net_thread.cc

@@ -17,7 +17,7 @@ Thread::~Thread() = default;
 void* Thread::RunThread(void* arg) {
   auto thread = reinterpret_cast<Thread*>(arg);
   if (!(thread->thread_name().empty())) {
-    SetThreadName(pthread_self(), thread->thread_name());
+    SetThreadName(pthread_self(), "pika");
   }
   thread->ThreadMain();
   return nullptr;

src/pika_admin.cc

@@ -1600,6 +1600,12 @@ void ConfigCmd::ConfigGet(std::string& ret) {
     EncodeString(&config_body, g_pika_conf->slotmigrate() ? "yes" : "no");
   }
 
+  if (pstd::stringmatch(pattern.data(), "slow-cmd-pool", 1)) {
+    elements += 2;
+    EncodeString(&config_body, "slow-cmd-pool");
+    EncodeString(&config_body, g_pika_conf->slow_cmd_pool() ? "yes" : "no");
+  }
+
   if (pstd::stringmatch(pattern.data(), "slotmigrate-thread-num", 1)!= 0) {
     elements += 2;
     EncodeString(&config_body, "slotmigrate-thread-num");
@@ -2129,6 +2135,7 @@ void ConfigCmd::ConfigSet(std::shared_ptr<DB> db) {
         "requirepass",
         "masterauth",
         "slotmigrate",
+        "slow-cmd-pool",
         "slotmigrate-thread-num",
         "thread-migrate-keys-num",
         "userpass",
@@ -2288,6 +2295,19 @@ void ConfigCmd::ConfigSet(std::shared_ptr<DB> db) {
     }
     g_pika_conf->SetSlotMigrate(slotmigrate);
     res_.AppendStringRaw("+OK\r\n");
+  } else if (set_item == "slow_cmd_pool") {
+    bool SlowCmdPool;
+    if (value == "yes") {
+      SlowCmdPool = true;
+      g_pika_server->SetSlowCmdThreadPoolFlag(SlowCmdPool);
+    } else if (value == "no") {
+      SlowCmdPool = false;
+    } else {
+      res_.AppendStringRaw( "-ERR Invalid argument \'" + value + "\' for CONFIG SET 'slow-cmd-pool'\r\n");
+      return;
+    }
+    g_pika_conf->SetSlowCmdPool(SlowCmdPool);
+    res_.AppendStringRaw("+OK\r\n");
   } else if (set_item == "slowlog-log-slower-than") {
     if ((pstd::string2int(value.data(), value.size(), &ival) == 0) || ival < 0) {
       res_.AppendStringRaw("-ERR Invalid argument \'" + value + "\' for CONFIG SET 'slowlog-log-slower-than'\r\n");

src/pika_client_processor.cc

@@ -9,10 +9,6 @@
 
 PikaClientProcessor::PikaClientProcessor(size_t worker_num, size_t max_queue_size, const std::string& name_prefix) {
   pool_ = std::make_unique<net::ThreadPool>(worker_num, max_queue_size, name_prefix + "Pool");
-  for (size_t i = 0; i < worker_num; ++i) {
-    bg_threads_.push_back(std::make_unique<net::BGThread>(max_queue_size));
-    bg_threads_.back()->set_thread_name(name_prefix + "BgThread");
-  }
 }
 
 PikaClientProcessor::~PikaClientProcessor() {
@@ -24,29 +20,15 @@ int PikaClientProcessor::Start() {
   if (res != net::kSuccess) {
     return res;
   }
-  for (auto& bg_thread : bg_threads_) {
-    res = bg_thread->StartThread();
-    if (res != net::kSuccess) {
-      return res;
-    }
-  }
   return res;
 }
 
 void PikaClientProcessor::Stop() {
   pool_->stop_thread_pool();
-  for (auto & bg_thread : bg_threads_) {
-    bg_thread->StopThread();
-  }
 }
 
 void PikaClientProcessor::SchedulePool(net::TaskFunc func, void* arg) { pool_->Schedule(func, arg); }
 
-void PikaClientProcessor::ScheduleBgThreads(net::TaskFunc func, void* arg, const std::string& hash_str) {
-  std::size_t index = std::hash<std::string>{}(hash_str) % bg_threads_.size();
-  bg_threads_[index]->Schedule(func, arg);
-}
-
 size_t PikaClientProcessor::ThreadPoolCurQueueSize() {
   size_t cur_size = 0;
   if (pool_) {

src/pika_conf.cc

@@ -66,6 +66,11 @@ int PikaConf::Load() {
   GetConfStr("slotmigrate", &smgrt);
   slotmigrate_.store(smgrt == "yes" ? true : false);
 
+  // slow cmd thread pool
+  std::string slowcmdpool;
+  GetConfStr("slow-cmd-pool", &slowcmdpool);
+  slow_cmd_pool_.store(slowcmdpool == "yes" ? true : false);
+
   int binlog_writer_num = 1;
   GetConfInt("binlog-writer-num", &binlog_writer_num);
   if (binlog_writer_num <= 0 || binlog_writer_num > 24) {
@@ -154,11 +159,11 @@ int PikaConf::Load() {
   }
 
   GetConfInt("slow-cmd-thread-pool-size", &slow_cmd_thread_pool_size_);
-  if (slow_cmd_thread_pool_size_ <= 0) {
-    slow_cmd_thread_pool_size_ = 12;
+  if (slow_cmd_thread_pool_size_ < 0) {
+    slow_cmd_thread_pool_size_ = 8;
   }
-  if (slow_cmd_thread_pool_size_ > 100) {
-    slow_cmd_thread_pool_size_ = 100;
+  if (slow_cmd_thread_pool_size_ > 50) {
+    slow_cmd_thread_pool_size_ = 50;
   }
 
   std::string slow_cmd_list;

src/pika_server.cc

@@ -43,6 +43,7 @@ void DoPurgeDir(void* arg) {
 
 PikaServer::PikaServer()
     : exit_(false),
+      slow_cmd_thread_pool_flag_(false),
       last_check_compact_time_({0, 0}),
       last_check_resume_time_({0, 0}),
       repl_state_(PIKA_REPL_NO_CONNECT),
@@ -100,6 +101,7 @@ PikaServer::PikaServer()
   }
 
   acl_ = std::make_unique<::Acl>();
+  SetSlowCmdThreadPoolFlag(g_pika_conf->slow_cmd_pool());
 }
 
 PikaServer::~PikaServer() {
@@ -166,12 +168,6 @@ void PikaServer::Start() {
     LOG(FATAL) << "Start PikaClientProcessor Error: " << ret
                << (ret == net::kCreateThreadError ? ": create thread error " : ": other error");
   }
-  ret = pika_slow_cmd_thread_pool_->start_thread_pool();
-  if (ret != net::kSuccess) {
-    dbs_.clear();
-    LOG(FATAL) << "Start PikaLowLevelThreadPool Error: " << ret
-               << (ret == net::kCreateThreadError ? ": create thread error " : ": other error");
-  }
   ret = pika_dispatch_thread_->StartThread();
   if (ret != net::kSuccess) {
     dbs_.clear();
@@ -205,6 +201,21 @@ void PikaServer::Start() {
   LOG(INFO) << "Goodbye...";
 }
 
+void PikaServer::SetSlowCmdThreadPoolFlag(bool flag) {
+  slow_cmd_thread_pool_flag_ = flag;
+  int ret = 0;
+  if (flag) {
+    ret = pika_slow_cmd_thread_pool_->start_thread_pool();
+    if (ret != net::kSuccess) {
+      dbs_.clear();
+      LOG(FATAL) << "Start PikaLowLevelThreadPool Error: " << ret
+                 << (ret == net::kCreateThreadError ? ": create thread error " : ": other error");
+    }
+  } else {
+    pika_slow_cmd_thread_pool_->stop_thread_pool();
+  }
+}
+
 void PikaServer::Exit() {
   g_pika_server->DisableCompact();
   exit_mutex_.unlock();
@@ -714,10 +725,6 @@ void PikaServer::ScheduleClientPool(net::TaskFunc func, void* arg, bool is_slow_
   pika_client_processor_->SchedulePool(func, arg);
 }
 
-void PikaServer::ScheduleClientBgThreads(net::TaskFunc func, void* arg, const std::string& hash_str) {
-  pika_client_processor_->ScheduleBgThreads(func, arg, hash_str);
-}
-
 size_t PikaServer::ClientProcessorThreadPoolCurQueueSize() {
   if (!pika_client_processor_) {
     return 0;