mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-03 13:02:00 +00:00
97 lines
7.2 KiB
Markdown
97 lines
7.2 KiB
Markdown
---
|
|
slug: /en/operations/system-tables/stack_trace
|
|
---
|
|
# stack_trace
|
|
|
|
Contains stack traces of all server threads. Allows developers to introspect the server state.
|
|
|
|
To analyze stack frames, use the `addressToLine`, `addressToLineWithInlines`, `addressToSymbol` and `demangle` [introspection functions](../../sql-reference/functions/introspection.md).
|
|
|
|
Columns:
|
|
|
|
- `thread_name` ([String](../../sql-reference/data-types/string.md)) — Thread name.
|
|
- `thread_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Thread identifier.
|
|
- `query_id` ([String](../../sql-reference/data-types/string.md)) — Query identifier that can be used to get details about a query that was running from the [query_log](../system-tables/query_log.md) system table.
|
|
- `trace` ([Array(UInt64)](../../sql-reference/data-types/array.md)) — A [stack trace](https://en.wikipedia.org/wiki/Stack_trace) which represents a list of physical addresses where the called methods are stored.
|
|
|
|
:::tip
|
|
Check out the Knowledge Base for some handy queries, including [how to see what threads are currently running](https://clickhouse.com/docs/knowledgebase/find-expensive-queries) and [useful queries for troubleshooting](https://clickhouse.com/docs/knowledgebase/useful-queries-for-troubleshooting).
|
|
:::
|
|
|
|
**Example**
|
|
|
|
Enabling introspection functions:
|
|
|
|
``` sql
|
|
SET allow_introspection_functions = 1;
|
|
```
|
|
|
|
Getting symbols from ClickHouse object files:
|
|
|
|
``` sql
|
|
WITH arrayMap(x -> demangle(addressToSymbol(x)), trace) AS all SELECT thread_name, thread_id, query_id, arrayStringConcat(all, '\n') AS res FROM system.stack_trace LIMIT 1 \G;
|
|
```
|
|
|
|
``` text
|
|
Row 1:
|
|
──────
|
|
thread_name: QueryPipelineEx
|
|
thread_id: 743490
|
|
query_id: dc55a564-febb-4e37-95bb-090ef182c6f1
|
|
res: memcpy
|
|
large_ralloc
|
|
arena_ralloc
|
|
do_rallocx
|
|
Allocator<true, true>::realloc(void*, unsigned long, unsigned long, unsigned long)
|
|
HashTable<unsigned long, HashMapCell<unsigned long, char*, HashCRC32<unsigned long>, HashTableNoState, PairNoInit<unsigned long, char*>>, HashCRC32<unsigned long>, HashTableGrowerWithPrecalculation<8ul>, Allocator<true, true>>::resize(unsigned long, unsigned long)
|
|
void DB::Aggregator::executeImplBatch<false, false, true, DB::AggregationMethodOneNumber<unsigned long, HashMapTable<unsigned long, HashMapCell<unsigned long, char*, HashCRC32<unsigned long>, HashTableNoState, PairNoInit<unsigned long, char*>>, HashCRC32<unsigned long>, HashTableGrowerWithPrecalculation<8ul>, Allocator<true, true>>, true, false>>(DB::AggregationMethodOneNumber<unsigned long, HashMapTable<unsigned long, HashMapCell<unsigned long, char*, HashCRC32<unsigned long>, HashTableNoState, PairNoInit<unsigned long, char*>>, HashCRC32<unsigned long>, HashTableGrowerWithPrecalculation<8ul>, Allocator<true, true>>, true, false>&, DB::AggregationMethodOneNumber<unsigned long, HashMapTable<unsigned long, HashMapCell<unsigned long, char*, HashCRC32<unsigned long>, HashTableNoState, PairNoInit<unsigned long, char*>>, HashCRC32<unsigned long>, HashTableGrowerWithPrecalculation<8ul>, Allocator<true, true>>, true, false>::State&, DB::Arena*, unsigned long, unsigned long, DB::Aggregator::AggregateFunctionInstruction*, bool, char*) const
|
|
DB::Aggregator::executeImpl(DB::AggregatedDataVariants&, unsigned long, unsigned long, std::__1::vector<DB::IColumn const*, std::__1::allocator<DB::IColumn const*>>&, DB::Aggregator::AggregateFunctionInstruction*, bool, bool, char*) const
|
|
DB::Aggregator::executeOnBlock(std::__1::vector<COW<DB::IColumn>::immutable_ptr<DB::IColumn>, std::__1::allocator<COW<DB::IColumn>::immutable_ptr<DB::IColumn>>>, unsigned long, unsigned long, DB::AggregatedDataVariants&, std::__1::vector<DB::IColumn const*, std::__1::allocator<DB::IColumn const*>>&, std::__1::vector<std::__1::vector<DB::IColumn const*, std::__1::allocator<DB::IColumn const*>>, std::__1::allocator<std::__1::vector<DB::IColumn const*, std::__1::allocator<DB::IColumn const*>>>>&, bool&) const
|
|
DB::AggregatingTransform::work()
|
|
DB::ExecutionThreadContext::executeTask()
|
|
DB::PipelineExecutor::executeStepImpl(unsigned long, std::__1::atomic<bool>*)
|
|
void std::__1::__function::__policy_invoker<void ()>::__call_impl<std::__1::__function::__default_alloc_func<DB::PipelineExecutor::spawnThreads()::$_0, void ()>>(std::__1::__function::__policy_storage const*)
|
|
ThreadPoolImpl<ThreadFromGlobalPoolImpl<false>>::worker(std::__1::__list_iterator<ThreadFromGlobalPoolImpl<false>, void*>)
|
|
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 ()>, Priority, std::__1::optional<unsigned long>, bool)::'lambda0'()>(void&&)::'lambda'(), void ()>>(std::__1::__function::__policy_storage const*)
|
|
void* std::__1::__thread_proxy[abi:v15000]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct>>, void ThreadPoolImpl<std::__1::thread>::scheduleImpl<void>(std::__1::function<void ()>, Priority, std::__1::optional<unsigned long>, bool)::'lambda0'()>>(void*)
|
|
```
|
|
|
|
Getting filenames and line numbers in ClickHouse source code:
|
|
|
|
``` sql
|
|
WITH arrayMap(x -> addressToLine(x), trace) AS all, arrayFilter(x -> x LIKE '%/dbms/%', all) AS dbms SELECT thread_name, thread_id, query_id, arrayStringConcat(notEmpty(dbms) ? dbms : all, '\n') AS res FROM system.stack_trace LIMIT 1 \G;
|
|
```
|
|
|
|
``` text
|
|
Row 1:
|
|
──────
|
|
thread_name: clickhouse-serv
|
|
|
|
thread_id: 686
|
|
query_id: cad353e7-1c29-4b2e-949f-93e597ab7a54
|
|
res: /lib/x86_64-linux-gnu/libc-2.27.so
|
|
/build/obj-x86_64-linux-gnu/../src/Storages/System/StorageSystemStackTrace.cpp:182
|
|
/build/obj-x86_64-linux-gnu/../contrib/libcxx/include/vector:656
|
|
/build/obj-x86_64-linux-gnu/../src/Interpreters/InterpreterSelectQuery.cpp:1338
|
|
/build/obj-x86_64-linux-gnu/../src/Interpreters/InterpreterSelectQuery.cpp:751
|
|
/build/obj-x86_64-linux-gnu/../contrib/libcxx/include/optional:224
|
|
/build/obj-x86_64-linux-gnu/../src/Interpreters/InterpreterSelectWithUnionQuery.cpp:192
|
|
/build/obj-x86_64-linux-gnu/../src/Interpreters/executeQuery.cpp:384
|
|
/build/obj-x86_64-linux-gnu/../src/Interpreters/executeQuery.cpp:643
|
|
/build/obj-x86_64-linux-gnu/../src/Server/TCPHandler.cpp:251
|
|
/build/obj-x86_64-linux-gnu/../src/Server/TCPHandler.cpp:1197
|
|
/build/obj-x86_64-linux-gnu/../contrib/poco/Net/src/TCPServerConnection.cpp:57
|
|
/build/obj-x86_64-linux-gnu/../contrib/libcxx/include/atomic:856
|
|
/build/obj-x86_64-linux-gnu/../contrib/poco/Foundation/include/Poco/Mutex_POSIX.h:59
|
|
/build/obj-x86_64-linux-gnu/../contrib/poco/Foundation/include/Poco/AutoPtr.h:223
|
|
/lib/x86_64-linux-gnu/libpthread-2.27.so
|
|
/lib/x86_64-linux-gnu/libc-2.27.so
|
|
```
|
|
|
|
**See Also**
|
|
|
|
- [Introspection Functions](../../sql-reference/functions/introspection.md) — Which introspection functions are available and how to use them.
|
|
- [system.trace_log](../system-tables/trace_log.md) — Contains stack traces collected by the sampling query profiler.
|
|
- [arrayMap](../../sql-reference/functions/array-functions.md#array-map) — Description and usage example of the `arrayMap` function.
|
|
- [arrayFilter](../../sql-reference/functions/array-functions.md#array-filter) — Description and usage example of the `arrayFilter` function.
|