mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-05 05:52:05 +00:00
69 lines
3.0 KiB
C++
69 lines
3.0 KiB
C++
#pragma once
|
|
|
|
#include <ext/scope_guard.h>
|
|
#include <common/logger_useful.h>
|
|
#include <Common/MemoryTracker.h>
|
|
|
|
/// Same as SCOPE_EXIT() but block the MEMORY_LIMIT_EXCEEDED errors.
|
|
///
|
|
/// Typical example of SCOPE_EXIT_MEMORY() usage is when code under it may do
|
|
/// some tiny allocations, that may fail under high memory pressure or/and low
|
|
/// max_memory_usage (and related limits).
|
|
///
|
|
/// NOTE: it should be used with caution.
|
|
#define SCOPE_EXIT_MEMORY(...) SCOPE_EXIT( \
|
|
MemoryTracker::LockExceptionInThread \
|
|
lock_memory_tracker(VariableContext::Global); \
|
|
__VA_ARGS__; \
|
|
)
|
|
|
|
/// Same as SCOPE_EXIT() but try/catch/tryLogCurrentException any exceptions.
|
|
///
|
|
/// SCOPE_EXIT_SAFE() should be used in case the exception during the code
|
|
/// under SCOPE_EXIT() is not "that fatal" and error message in log is enough.
|
|
///
|
|
/// Good example is calling CurrentThread::detachQueryIfNotDetached().
|
|
///
|
|
/// Anti-pattern is calling WriteBuffer::finalize() under SCOPE_EXIT_SAFE()
|
|
/// (since finalize() can do final write and it is better to fail abnormally
|
|
/// instead of ignoring write error).
|
|
///
|
|
/// NOTE: it should be used with double caution.
|
|
#define SCOPE_EXIT_SAFE(...) SCOPE_EXIT( \
|
|
try \
|
|
{ \
|
|
__VA_ARGS__; \
|
|
} \
|
|
catch (...) \
|
|
{ \
|
|
tryLogCurrentException(__PRETTY_FUNCTION__); \
|
|
} \
|
|
)
|
|
|
|
/// Same as SCOPE_EXIT() but:
|
|
/// - block the MEMORY_LIMIT_EXCEEDED errors,
|
|
/// - try/catch/tryLogCurrentException any exceptions.
|
|
///
|
|
/// SCOPE_EXIT_MEMORY_SAFE() can be used when the error can be ignored, and in
|
|
/// addition to SCOPE_EXIT_SAFE() it will also lock MEMORY_LIMIT_EXCEEDED to
|
|
/// avoid such exceptions.
|
|
///
|
|
/// It does exists as a separate helper, since you do not need to lock
|
|
/// MEMORY_LIMIT_EXCEEDED always (there are cases when code under SCOPE_EXIT does
|
|
/// not do any allocations, while LockExceptionInThread increment atomic
|
|
/// variable).
|
|
///
|
|
/// NOTE: it should be used with triple caution.
|
|
#define SCOPE_EXIT_MEMORY_SAFE(...) SCOPE_EXIT( \
|
|
try \
|
|
{ \
|
|
MemoryTracker::LockExceptionInThread \
|
|
lock_memory_tracker(VariableContext::Global); \
|
|
__VA_ARGS__; \
|
|
} \
|
|
catch (...) \
|
|
{ \
|
|
tryLogCurrentException(__PRETTY_FUNCTION__); \
|
|
} \
|
|
)
|