サーバーで現在実行中のコードを確認する
system.stack_trace テーブルにクエリを実行すると、実行時点で各サーバー上のすべてのスレッドのスタックトレースを取得できます。
SELECT
count(),
arrayStringConcat(arrayMap(x -> concat(demangle(addressToSymbol(x)), '\n ', addressToLine(x)), trace), '\n') AS sym
FROM system.stack_trace
GROUP BY trace
ORDER BY count() DESC
LIMIT 10
FORMAT Vertical
SETTINGS allow_introspection_functions = 1;
allow_introspection_functions を 1 に設定する必要があります。) レスポンスは次のようになります。
Row 1:
──────
count(): 144
sym: pthread_cond_wait
DB::BackgroundSchedulePool::threadFunction()
/usr/bin/clickhouse
/usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
Row 2:
──────
count(): 80
sym: pthread_cond_wait
std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&)
/usr/bin/clickhouse
DB::MergeTreeBackgroundExecutor<DB::OrdinaryRuntimeQueue>::threadFunction()
/usr/bin/clickhouse
ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::worker(std::__1::__list_iterator<ThreadFromGlobalPoolImpl<false>, void*>)
/usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<false>::ThreadFromGlobalPoolImpl<void ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::scheduleImpl<void>(std::__1::function<void ()>, long, std::__1::optional<unsigned long>, bool)::'lambda0'()>(void&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
/usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
Row 3:
──────
count(): 55
sym: pthread_cond_wait
ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::worker(std::__1::__list_iterator<ThreadFromGlobalPoolImpl<false>, void*>)
/usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<false>::ThreadFromGlobalPoolImpl<void ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::scheduleImpl<void>(std::__1::function<void ()>, long, std::__1::optional<unsigned long>, bool)::'lambda0'()>(void&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
/usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
Row 4:
──────
count(): 16
sym:
DB::AsynchronousInsertQueue::processBatchDeadlines(unsigned long)
/usr/bin/clickhouse
/usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
Row 5:
──────
count(): 16
sym: pthread_cond_wait
std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&)
/usr/bin/clickhouse
DB::MergeTreeBackgroundExecutor<DB::MergeMutateRuntimeQueue>::threadFunction()
/usr/bin/clickhouse
ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::worker(std::__1::__list_iterator<ThreadFromGlobalPoolImpl<false>, void*>)
/usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<false>::ThreadFromGlobalPoolImpl<void ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::scheduleImpl<void>(std::__1::function<void ()>, long, std::__1::optional<unsigned long>, bool)::'lambda0'()>(void&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
/usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
Row 6:
──────
count(): 10
sym: poll
Poco::Net::SocketImpl::pollImpl(Poco::Timespan&, int)
/usr/bin/clickhouse
Poco::Net::SocketImpl::poll(Poco::Timespan const&, int)
/usr/bin/clickhouse
Poco::Net::TCPServer::run()
/usr/bin/clickhouse
Poco::ThreadImpl::runnableEntry(void*)
/usr/bin/clickhouse
clone
Row 7:
──────
count(): 9
sym: pthread_cond_wait
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
Row 8:
──────
count(): 7
sym: poll
Poco::Net::SocketImpl::pollImpl(Poco::Timespan&, int)
/usr/bin/clickhouse
Poco::Net::SocketImpl::poll(Poco::Timespan const&, int)
/usr/bin/clickhouse
DB::ReadBufferFromPocoSocket::poll(unsigned long) const
/usr/bin/clickhouse
DB::TCPHandler::runImpl()
/usr/bin/clickhouse
DB::TCPHandler::run()
/usr/bin/clickhouse
/usr/bin/clickhouse
Poco::Net::TCPServerConnection::start()
/usr/bin/clickhouse
Poco::Net::TCPServerDispatcher::run()
/usr/bin/clickhouse
Poco::PooledThread::run()
/usr/bin/clickhouse
Poco::ThreadImpl::runnableEntry(void*)
/usr/bin/clickhouse
clone
Row 9:
───────
count(): 3
sym: pthread_cond_wait
Poco::EventImpl::waitImpl()
/usr/bin/clickhouse
DB::DDLWorker::runCleanupThread()
/usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<true>::ThreadFromGlobalPoolImpl<void (DB::DDLWorker::*)(), DB::DDLWorker*>(void (DB::DDLWorker::*&&)(), DB::DDLWorker*&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
/usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
Row 10:
───────
count(): 3
sym: pthread_cond_wait
Poco::EventImpl::waitImpl()
/usr/bin/clickhouse
DB::DDLWorker::runMainThread()
/usr/bin/clickhouse
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<ThreadFromGlobalPoolImpl<true>::ThreadFromGlobalPoolImpl<void (DB::DDLWorker::*)(), DB::DDLWorker*>(void (DB::DDLWorker::*&&)(), DB::DDLWorker*&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
/usr/bin/clickhouse
ThreadPoolImpl<std::__1::thread>::worker(std::__1::__list_iterator<std::__1::thread, void*>)
/usr/bin/clickhouse
/usr/bin/clickhouse
clone
10 rows in set. Elapsed: 0.026 sec.
ClickHouse を .deb/.rpm/.tgz からインストールした場合は、ソースコード上の行番号を確認するために、デバッグ情報付きパッケージを追加でインストールすることもできます。ClickHouse を単一バイナリとしてインストールしている場合は、デバッグ情報はすでに含まれています。
sudo apt install clickhouse-common-static-dbg
より概要レベルの情報については、以下のシステムテーブルも参照してください。
- system.processes
- system.query_log
- system.metric_log
- system.asynchronous_metric_log
- system.trace_log
- system.processor_profile_log