[collectd] Generic JMX plugin and JVM restart

[Toni Moreno]

Hi to all.

I've been working with GenericJMX jvm plugin (current master version in git
--collectd 5.4.1--) and I've tested with hotSpot jdk , jrockit from oracle
and j9vm from IBM.

And collectd -  GenericJMX - Always reconnects when JVM process restart..
no need to restart collectd.

Best Regards

2014-09-25 18:40 GMT+02:00 Rahul Agarwal <RAgarwal at livegamer.com>:

>  Thanks Bryan. So I tried it out. Initially it worked and I was
> collecting data! It is nice that there are minimal changes from GenericJMX
> in the configs.
>
> But after a re-deploy the reconnection failed. Now I have even tried
> restarted collectd but Fast jmx still seems to be unable to connect. I am
> able to connect to jmx via jconsole so the server is certainly good.
>
> Not sure if Fast jmx is remembering the bad state somewhere.
>
>
>
>
>
> *From:* Bryan Varner [mailto:bryan at varnernet.com]
> *Sent:* Tuesday, September 23, 2014 5:43 PM
> *To:* Rahul Agarwal
> *Cc:* collectd at verplant.org
> *Subject:* Re: [collectd] Generic JMX plugin and JVM restart
>
>
>
>
>
>   Nice, I can try it out. Does it re-connect on JVM restart?
>
>
>
> Short answer: Yes.
>
>
>
>
>
> Long answer:
>
>
>
> JMX over RMI (at least the Oracle/Sun/OpenJDK implementation) has a
> heartbeat timer (default I think is like 60 seconds or 5 minutes, I don’t
> recall which) that pings the remote server.
>
> If that times out (or the socket is explicitly closed) it marks the
> connection failed. The FastJMX plugin will detect that (it takes a while —
> several minutes is common — by the time the heartbeat fires and any timeout
> threshold is hit) and then initiates a reconnect attempt.
>
>
>
> Reconnects occur with a multiplied back off, so you don’t just keep
> hammering a ‘dead’ server. I believe the upper limit on the back off is 5
> minutes, but I could be mistaken. Eventually I’ll get around to making that
> configurable.
>
>
>
> Best of luck! Let me know if you have any issues!
>
>
>
> Regards,
>
> -Bryan
>
>
>
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>
>


-- 

Att

Toni Moreno

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