<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;"><br><div><div>On Apr 17, 2014, at 4:26 PM, Joshua Harlow <<a href="mailto:harlowja@yahoo-inc.com">harlowja@yahoo-inc.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 14px; font-family: Calibri, sans-serif;">
<div>Just an honest question (no negativity intended I swear!).</div>
<div><br>
</div>
<div>If a configuration option exists and only works with a patched eventlet why is that option an option to begin with? (I understand the reason for the patch, don't get me wrong).</div>
<div><br></div></div></blockquote><div><br></div><div>Right, it’s a valid question. This feature has existed one way or another in nova for quite a while. Initially the implementation in nova was wrong. I did not know that eventlet was also broken at the time, although I discovered it in the process of fixing nova’s code. I chose to leave the feature because it’s something that we absolutely need long term, unless you really want to live with DB calls blocking the whole process. I know I don’t. Unfortunately the bug in eventlet is out of our control. (I made an attempt at fixing it, but it’s not 100%. Eventlet folks currently have an alternative up that may or may not work… but certainly is not in a release yet.) We have an outstanding bug on our side to track this, also.</div><div><br></div><div>The below is comparing apples/oranges for me.</div><div><br></div><div>- Chris</div><div><br></div><br><blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; font-size: 14px; font-family: Calibri, sans-serif;"><div>
</div>
<div>Most users would not be able to use such a configuration since they do not have this patched eventlet (I assume a newer version of eventlet someday in the future will have this patch integrated in it?) so although I understand the frustration around this
I don't understand why it would be an option in the first place. An aside, if the only way to use this option is via a non-standard eventlet then how is this option tested in the community, aka outside of said company?</div>
<div><br>
</div>
<div><i>An example:</i></div>
<div><br>
</div>
<div>If yahoo has some patched kernel A that requires an XYZ config turned on in openstack and the only way to take advantage of kernel A is with XYZ config 'on', then it seems like that’s a yahoo only patch that is not testable and useable for others, even
if patched kernel A is somewhere on github it's still imho not something that should be a option in the community (anyone can throw stuff up on github and then say I need XYZ config to use it).</div>
<div><br>
</div>
<div>To me non-standard patches that require XYZ config in openstack shouldn't be part of the
<i>standard</i> openstack, no matter the company. If patch A is in the mainline kernel (or other mainline library), then sure it's fair game.</div>
<div><br>
</div>
<div>-Josh</div>
<div><br>
</div>
<span id="OLK_SRC_BODY_SECTION">
<div style="font-family: Calibri; font-size: 11pt; text-align: left; border-width: 1pt medium medium; border-style: solid none none; padding: 3pt 0in 0in; border-top-color: rgb(181, 196, 223);">
<span style="font-weight:bold">From: </span>Chris Behrens <<a href="mailto:cbehrens@codestud.com">cbehrens@codestud.com</a>><br>
<span style="font-weight:bold">Reply-To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, April 17, 2014 at 3:20 PM<br>
<span style="font-weight:bold">To: </span>OpenStack Development Mailing List <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>[openstack-dev] oslo removal of use_tpool conf option<br>
</div>
<div><br>
</div>
<blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;" type="cite">
<div>
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
<div><br>
</div>
<div>I’m going to try to not lose my cool here, but I’m extremely upset by this.</div>
<div><br>
</div>
<div>In December, oslo apparently removed the code for ‘use_tpool’ which allows you to run DB calls in Threads because it was ‘eventlet specific’. I noticed this when a review was posted to nova to add the option within nova itself:</div>
<div><br>
</div>
<div><a href="https://review.openstack.org/#/c/59760/">https://review.openstack.org/#/c/59760/</a></div>
<div><br>
</div>
<div>I objected to this and asked (more demanded) for this to be added back into oslo. It was not. What I did not realize when I was reviewing this nova patch, was that nova had already synced oslo’s change. And now we’ve released Icehouse with a conf option
missing that existed in Havana. Whatever projects were using oslo’s DB API code has had this option disappear (unless an alternative was merged). Maybe it’s only nova.. I don’t know.</div>
<div><br>
</div>
<div>Some sort of process broke down here. nova uses oslo. And oslo removed something nova uses without deprecating or merging an alternative into nova first. How I believe this should have worked:</div>
<div><br>
</div>
<div>1) All projects using oslo’s DB API code should have merged an alternative first.</div>
<div>2) Remove code from oslo.</div>
<div>3) Then sync oslo.</div>
<div><br>
</div>
<div>What do we do now? I guess we’ll have to back port the removed code into nova. I don’t know about other projects.</div>
<div><br>
</div>
<div>NOTE: Very few people are probably using this, because it doesn’t work without a patched eventlet. However, Rackspace happens to be one that does. And anyone waiting on a new eventlet to be released such that they could use this with Icehouse is currently
out of luck.</div>
<div><br>
</div>
<div>- Chris</div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
</blockquote>
</span>
</div>
</blockquote></div><br></body></html>