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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Raj,<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks for the reply. Manual clean-up is indeed required to deal with these rouge instances. It would be really convenient if loadbalancer resolved this scenario
automatically once an hour. One can dream (or implement)…<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Steve<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>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> rqbanerjee@gmail.com [mailto:rqbanerjee@gmail.com]
<b>On Behalf Of </b>Rajat Banerjee<br>
<b>Sent:</b> Monday, March 16, 2015 2:04 PM<br>
<b>To:</b> Steve Darnell<br>
<b>Cc:</b> Eduardo Gurgel Valente; Nicholas Chammas; starcluster@mit.edu<br>
<b>Subject:</b> Re: [StarCluster] How does StarCluster track the clusters it's managing?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Sorry for the super-slow response.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">The elastic load balancer parses the output of 'qhost' on the cluster:<br>
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<a href="https://github.com/jtriley/StarCluster/blob/develop/starcluster/balancers/sge/__init__.py#L59">https://github.com/jtriley/StarCluster/blob/develop/starcluster/balancers/sge/__init__.py#L59</a><o:p></o:p></p>
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<p class="MsoNormal">I don't remember the exact reason for using that instead of the same logic as 'listclusters' above, but here's my guess a few years after the fact:<o:p></o:p></p>
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<p class="MsoNormal">- Avoids another remote API call to AWS' tagging service to retrieve the tags for all instances within an account. This needs to be called every minute, so a speedy call to your cluster instead of to a remote API is beneficial<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">- qhost outputs the number of machines correctly configured and able to process work. If a machine shows up in 'listcluster' but not in 'qhost' it's likely not usable to process jobs, and would probably need
manual cleanup.<o:p></o:p></p>
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<p class="MsoNormal">HTH<o:p></o:p></p>
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<p class="MsoNormal">Raj<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Mar 10, 2015 at 4:04 PM, Steve Darnell <<a href="mailto:darnells@dnastar.com" target="_blank">darnells@dnastar.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">On a related topic, does anyone know how the load balancing feature tracks the cluster and its compute
nodes? I have gotten into situations where listclusters correctly reports that a cluster and its nodes are running (I can ssh into master and the nodes, etc.); however, loadbalance reports that the cluster is not running and refuses to balance the cluster.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Steve</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:starcluster-bounces@mit.edu" target="_blank">starcluster-bounces@mit.edu</a> [mailto:<a href="mailto:starcluster-bounces@mit.edu" target="_blank">starcluster-bounces@mit.edu</a>]
<b>On Behalf Of </b>Eduardo Gurgel Valente<br>
<b>Sent:</b> Tuesday, March 10, 2015 2:08 PM<br>
<b>To:</b> Nicholas Chammas<br>
<b>Cc:</b> <a href="mailto:starcluster@mit.edu" target="_blank">starcluster@mit.edu</a><br>
<b>Subject:</b> Re: [StarCluster] How does StarCluster track the clusters it's managing?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi Nick,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Look at the security group it creates. It follows a naming convention. In addition there are tags with encrypted information at play.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Eduardo<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Mon, Mar 9, 2015 at 11:16 PM, Nicholas Chammas <<a href="mailto:nicholas.chammas@gmail.com" target="_blank">nicholas.chammas@gmail.com</a>> wrote:<o:p></o:p></p>
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<p style="margin:0px!important">Howdy!<o:p></o:p></p>
<p style="margin:0px!important">At <a href="http://youtu.be/vC3lJcPq1FY?t=7m20s" target="_blank">
this point in the StarCluster demo video</a>, the presenter runs the following command to list all the clusters being managed by StarCluster:<o:p></o:p></p>
<pre style="mso-margin-top-alt:0in;margin-right:1.8pt;margin-bottom:0in;margin-left:1.8pt;margin-bottom:.0001pt;line-height:14.4pt"><code><span style="font-family:Consolas;color:#333333;border:solid #CCCCCC 1.0pt;padding:6.0pt;background:ghostwhite">starcluster listclusters</span></code><o:p></o:p></pre>
<p style="margin:0px!important">How does StarCluster track all the clusters it’s managing? Is it through the use of EC2 instance tags? A pointer to the relevant code would also be helpful.<o:p></o:p></p>
<p style="margin:0px!important">I’m looking to implement a feature similar to <code>
<span style="font-size:10.0pt;font-family:Consolas;border:solid #EAEAEA 1.0pt;padding:0in;background:#F8F8F8">listclusters</span></code> but for
<a href="http://spark.apache.org/docs/1.2.1/ec2-scripts.html" target="_blank">spark-ec2</a>. Tagging seems like the way to go to do that, but
<a href="https://issues.apache.org/jira/browse/SPARK-3332" target="_blank">we had some issues with it</a> when we used it with spark-ec2.<o:p></o:p></p>
<p style="margin:0px!important">So I’m curious to know how StarCluster did things.<o:p></o:p></p>
<p style="margin:0px!important">Nick<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:1.0pt"></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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