AndrewJD79 opened a new issue #12844: URL: https://github.com/apache/pulsar/issues/12844
**Describe the bug** Implementation of statistics in cpp client have two concurrency issues. 1. ProducerStatsImpl (and ConsumerStatsImpl) classes use a single shared lock to protect access to internal data. The lock is taken on each sent or received message. Under high load this shared lock causes signficant contention and performance degradation. Profiler shows that sending and receiving threads block each-other.  Since sending and receving functions access different member subset they should be protected by different mutex or other approach should be selected. As example after patching issue I've got about 1/3 throughtput improvement. As you can see on screenshot below threads are witing on I/O but not on mutexes.  2. ProducerStatsImpl implementation has races between destructor and DeadlineTimer callback. Consider following scenario: 1. ProducerStatsImpl destructor acquire the mutex 2. DeadlineTimer calls calback flushAndReset and blocked on mutex 3. ProducerStatsImpl calls timer.cancel and cancel any pending operation but it cannot cancel already executed calbback at step 2 4. ProducerStatsImpl destructor release mutex 5. DeadlineTimer acquire the mutex 6. ProducerStatsImpl destructor destroy object 7. DeadlineTimer callback access to deallocated memory Are you willing accept PR for issue one or both? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
