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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Not sure if Fast jmx is remembering the bad state somewhere.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Bryan Varner [mailto:bryan@varnernet.com]
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<b>Sent:</b> Tuesday, September 23, 2014 5:43 PM<br>
<b>To:</b> Rahul Agarwal<br>
<b>Cc:</b> collectd@verplant.org<br>
<b>Subject:</b> Re: [collectd] Generic JMX plugin and JVM restart<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Nice, I can try it out. Does it re-connect on JVM restart?<o:p></o:p></span></p>
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<p class="MsoNormal">Short answer: Yes.<o:p></o:p></p>
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<p class="MsoNormal">Long answer:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">Best of luck! Let me know if you have any issues!<o:p></o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
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<p class="MsoNormal">-Bryan<o:p></o:p></p>
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