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https://issues.apache.org/jira/browse/HBASE-16142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15369828#comment-15369828
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Andrew Purtell edited comment on HBASE-16142 at 7/10/16 4:27 PM:
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We definitely need to document and mention in release notes if we are enabling
UnlockCommercialFeatures by default in hbase-env. Anybody doing this in a
production setting without an Oracle support contract I think we need to assume
(IANAL) will be in violation of the Oracle Binary License. It's best to take an
expansive view when Oracle lawyers and compliance people are involved.
was (Author: apurtell):
We definitely need to document and mention in release notes if we are enabling
UnlockCommercialFeatures by default in hbase-env. Anybody doing this in a
production setting without an Oracle support contract will be in violation of
the Oracle Binary License.
> 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
> Assignee: Konstantin Ryakhovskiy
> Priority: Minor
> Labels: beginner
>
> 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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