<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">The problem I’ve had in the past, is that it stops collecting metrics for MBeans published by an application when it’s redeployed (JVM doesn’t restart, but the application does).<div><br></div><div>I don’t think it’s an issue with GenericJMX, so to speak, since it re-queries for each bean every read cycle. It seems to be something with the way jboss (or maybe the mbeanserver) is handling things.</div><div><br></div><div>I had this issue when I was using GenericJMX with GlassFish 3.x and JBoss community 7 / EAP 6, both running on the Oracle JVM.</div><div><br></div><div>Regards,</div><div><br></div><div>-Bryan</div><div><div><br><div><div>On Sep 29, 2014, at 12:49 AM, Toni Moreno <<a href="mailto:toni.moreno@gmail.com">toni.moreno@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">Hi to all.<div><br></div><div>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. </div><div><br></div><div>And collectd - GenericJMX - Always reconnects when JVM process restart.. no need to restart collectd.</div><div><br></div><div>Best Regards</div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-09-25 18:40 GMT+02:00 Rahul Agarwal <span dir="ltr"><<a href="mailto:RAgarwal@livegamer.com" target="_blank">RAgarwal@livegamer.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div><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.<u></u><u></u></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.<u></u><u></u></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.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><a name="148adb287087ed47__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></a></p>
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<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><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:<a href="mailto:bryan@varnernet.com" target="_blank">bryan@varnernet.com</a>]
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<b>Sent:</b> Tuesday, September 23, 2014 5:43 PM<span class=""><br>
<b>To:</b> Rahul Agarwal<br>
<b>Cc:</b> <a href="mailto:collectd@verplant.org" target="_blank">collectd@verplant.org</a><br>
<b>Subject:</b> Re: [collectd] Generic JMX plugin and JVM restart<u></u><u></u></span></span></p>
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<div><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?<u></u><u></u></span></p>
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<div><p class="MsoNormal">Short answer: Yes.<u></u><u></u></p>
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<div><p class="MsoNormal">Long answer:<u></u><u></u></p>
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<div><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.<u></u><u></u></p>
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<div><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.<u></u><u></u></p>
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<div><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.<u></u><u></u></p>
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<div><p class="MsoNormal">Best of luck! Let me know if you have any issues!<u></u><u></u></p>
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<div><p class="MsoNormal">Regards,<u></u><u></u></p>
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<div><p class="MsoNormal">-Bryan<u></u><u></u></p>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><p align="right"><font face="Verdana, Geneva, Arial, Sans-serif">Att</font></p><p align="right"><font face="Verdana, Geneva, Arial, Sans-serif">Toni Moreno</font></p><p align="right"><font face="Verdana, Geneva, Arial, Sans-serif">699706656</font></p><img src="http://graphics.hotmail.com/greypixel.gif" height="2" vspace="9" width="100%"><br><p align="right"><em>Si no quieres perderte en el olvido tan pronto como estés muerto y corrompido, </em></p><p align="right"><em>escribe cosas dignas de leerse, o haz cosas dignas de escribirse.</em></p><div> <br class="webkit-block-placeholder"></div><p align="right"><strong><em>Benjamin Franklin</em></strong> <br></p>
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