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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Team,<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">In order to resolve issue #3, it looks like we have to significantly reduce the memory consumption of the gate tests. Details can be found in this patch
<a href="https://review.openstack.org/#/c/276958/">https://review.openstack.org/#/c/276958/</a> . For core team, a fast review and approval of that patch would be greatly appreciated, since it is hard to work with a gate that takes several hours to complete.
Thanks.<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">Hongbin<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 lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Corey O'Brien [mailto:coreypobrien@gmail.com]
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<b>Sent:</b> February-05-16 12:04 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> [openstack-dev] [Magnum] gate issues<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So as we're all aware, the gate is a mess right now. I wanted to sum up some of the issues so we can figure out solutions.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">1. The functional-api job sometimes fails because bays timeout building after 1 hour. The logs look something like this:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">magnum.tests.functional.api.v1.test_bay.BayTest.test_create_list_and_delete_bays [3733.626171s] ... FAILED</span><o:p></o:p></p>
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<p class="MsoNormal">I can reproduce this hang on my devstack with etcdctl 2.0.10 as described in this bug (<a href="https://bugs.launchpad.net/magnum/+bug/1541105">https://bugs.launchpad.net/magnum/+bug/1541105</a>), but apparently either my fix with using
2.2.5 (<a href="https://review.openstack.org/#/c/275994/">https://review.openstack.org/#/c/275994/</a>) is incomplete or there is another intermittent problem because it happened again even with that fix: (<a href="http://logs.openstack.org/94/275994/1/check/gate-functional-dsvm-magnum-api/32aacb1/console.html">http://logs.openstack.org/94/275994/1/check/gate-functional-dsvm-magnum-api/32aacb1/console.html</a>)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">2. The k8s job has some sort of intermittent hang as well that causes a similar symptom as with swarm. <a href="https://bugs.launchpad.net/magnum/+bug/1541964">https://bugs.launchpad.net/magnum/+bug/1541964</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">3. When the functional-api job runs, it frequently destroys the VM causing the jenkins slave agent to die. Example:
<a href="http://logs.openstack.org/03/275003/6/check/gate-functional-dsvm-magnum-api/a9a0eb9/console.html">
http://logs.openstack.org/03/275003/6/check/gate-functional-dsvm-magnum-api/a9a0eb9//console.html</a><o:p></o:p></p>
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<p class="MsoNormal">When this happens, zuul re-queues a new build from the start on a new VM. This can happen many times in a row before the job completes.<o:p></o:p></p>
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<p class="MsoNormal">I chatted with openstack-infra about this and after taking a look at one of the VMs, it looks like memory over consumption leading to thrashing was a possible culprit. The sshd daemon was also dead but the console showed things like "INFO:
task kswapd0:77 blocked for more than 120 seconds". A cursory glance and following some of the jobs seems to indicate that this doesn't happen on RAX VMs which have swap devices unlike the OVH VMs as well.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">4. In general, even when things work, the gate is really slow. The sequential master-then-node build process in combination with underpowered VMs makes bay builds take 25-30 minutes when they do succeed. Since we're already close to tipping
over a VM, we run functional tests with concurrency=1, so 2 bay builds means almost the entire allotted devstack testing time (generally 75 minutes of actual test time available it seems).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Corey<o:p></o:p></p>
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