[jira] [Updated] (TS-2156) Stats trap in threads created by spawn_event_threads() and spawn_thread()

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-2156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leif Hedstrom updated TS-2156:
------------------------------

    Fix Version/s: 4.1.0
    
> 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
>             Fix For: 4.1.0
>
>
> 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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