<p>The async operation basically related to chat history setup on our production server. It fetches chat sessions and relevent info from backend (REDIS + MySQL or Elastic Search) using mod_perl.</p>
<p>According to our load test results, the whole operation takes roughly 500 to 800 ms (<1 second) under normal conditions but may prolong upto 5000 ms (5 seconds) in case backend service (MySQL or ES) failure.</p>
<p>The server logs show that transaction in question was started at 03:02:00 CET on Sept. 03, 2019 and kamailio crashed at 03:02:03 CET, there was a backend failure (REDIS was unreachable at the time).</p>

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