[jira] [Created] (HBASE-16142) Trigger JFR session when under duress -- e.g. backed-up request queue count -- and dump the recording to log dir

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

stack created HBASE-16142:
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             Summary: Trigger JFR session when under duress -- e.g. backed-up request queue count -- and dump the recording to log dir
                 Key: HBASE-16142
                 URL: https://issues.apache.org/jira/browse/HBASE-16142
             Project: HBase
          Issue Type: Task
          Components: Operability
            Reporter: stack
            Priority: Minor


Chatting today w/ a mighty hbase operator on how to figure what is happening during transitory latency spike or any other transitory 'weirdness' in a server, the idea came up that a java flight recording during a spike would include a pretty good picture of what is going on during the time of duress (more ideal would be a trace of the explicit slow queries showing call stack with timings dumped to a sink for later review; i.e. trigger an htrace when a query is slow...).

Taking a look, programmatically triggering a JFR recording seems doable, if awkward (MBean invocations). There is even a means of specifying 'triggers' based off any published mbean emission -- e.g. a query queue count threshold -- which looks nice. See https://community.oracle.com/thread/3676275?start=0&tstart=0 and https://docs.oracle.com/javacomponents/jmc-5-4/jfr-runtime-guide/run.htm#JFRUH184

This feature could start out as a blog post describing how to do it for one server. A plugin on Canary that looks at mbean values and if over a configured threshold, triggers a recording remotely could be next. Finally could integrate a couple of triggers that fire when issue via the trigger mechanism.

Marking as beginner feature.



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