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https://issues.apache.org/jira/browse/SAMZA-192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14019358#comment-14019358
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Chris Riccomini commented on SAMZA-192:
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The problem with both options is that they're YARN-specific, and the logic for
logging container pid information should ideally live in the SamzaContainer so
that we can see PID information whether we use YARN, Mesos, EC2, or just a
regular old Java process.
The proposed solution on the StackOverflow link is to just use:
{code}
ManagementFactory.getRuntimeMXBean().getName()
{code}
It sounds like this code isn't guaranteed to log the PID--it's just guaranteed
to log a unique identifier for the JVM, but in the case of linux, it logs the
<pid>@<hostname>, which should do fine. I tend to favor this approach because
it's not too invasive--it's just standard Java. Some of the other proposals in
the StackOverflow discussion require third party libraries, which I'm hesitant
to add for one small nice-to-have feature.
If we remove YARN from the equation, are you (or anyone else) aware of any
other good ways to get PID information from a Java process?
Another approach, which is YARN-specific, but doesn't require modifying the
SamzaContainer would be to log the PID information in the AM. I haven't dug
into the AM RPC calls at all, but perhaps it gets PID information from the NM
when a new container is allocated? If so, we should to be able to at least log
the PID information in the AM's logs. This approach doesn't prevent us from
also using the MXBean approach (or any other approach) in the SamzaContainer,
either.
> Log container PID
> -----------------
>
> Key: SAMZA-192
> URL: https://issues.apache.org/jira/browse/SAMZA-192
> Project: Samza
> Issue Type: Improvement
> Components: container
> Reporter: Jakob Homan
> Priority: Minor
> Labels: newbie
>
> It would be nice if we logged the container PID at startup for easy reference
> later on. However, looks like Java may make this a bit difficult:
> http://stackoverflow.com/questions/35842/how-can-a-java-program-get-its-own-process-id
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