Yunkai Zhang created TS-2156:
--------------------------------
Summary: Stats trap in threads created by spawn_event_threads()
and spawn_thread()
Key: TS-2156
URL: https://issues.apache.org/jira/browse/TS-2156
Project: Traffic Server
Issue Type: Improvement
Components: Stats
Reporter: Yunkai Zhang
There are two ways to create threads in ATS:
1) By EventProcessor::spawn_event_threads(), such as ET_NET threads.
2) By EventProcessor::spawn_thread(), such as flush thread.
But I found that we can't stats the same things across these two type of
threads.
For example, I used the following statement in _checkout_write() to do stats
before add to flusher queue:
{code}
LogBuffer *
LogObject::_checkout_write(size_t * write_offset, size_t bytes_needed) {
...
LOG_SUM_DYN_STAT(log_stat_bytes_add_to_flush_queue,
buffer->header()->byte_count);
m_buffer_manager[idx].add_to_flush_queue(buffer);
Log::preproc_notify[idx].signal();
...
}
{code}
As _checkout_write() function will be executed at ET_NET threads and flush
thread, the stats value will be incomplete -- the value collected in flush
thread will not be merged into the final result.
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