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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26293] Major performance degradation on primary when upgrading from 3.2.6 -&gt; 3.2.9 </title>
                <link>https://jira.mongodb.org/browse/SERVER-26293</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Last night we upgraded our replica set from 3.2.6 to 3.2.9 and performance on the primary has plummeted.  We&apos;re getting terrible performance all around, queries and connections seem to be piling up even though load is pretty similar to where we were yesterday.&lt;/p&gt;</description>
                <environment></environment>
        <key id="318515">SERVER-26293</key>
            <summary>Major performance degradation on primary when upgrading from 3.2.6 -&gt; 3.2.9 </summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="tinkler@vocabulary.com">Marc Tinkler</reporter>
                        <labels>
                    </labels>
                <created>Fri, 23 Sep 2016 18:06:06 +0000</created>
                <updated>Wed, 14 Dec 2016 22:05:38 +0000</updated>
                            <resolved>Wed, 14 Dec 2016 22:05:38 +0000</resolved>
                                    <version>3.2.9</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1458454" author="thomas.schubert" created="Wed, 14 Dec 2016 22:05:27 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tinkler%40vocabulary.com&quot; class=&quot;user-hover&quot; rel=&quot;tinkler@vocabulary.com&quot;&gt;tinkler@vocabulary.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I see you&apos;ve successfully upgraded to MongoDB 3.2.10. Since we haven&apos;t heard back from you, I assume the issue has been resolved. Therefore, I&apos;ll be closing this ticket.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1398964" author="thomas.schubert" created="Mon, 3 Oct 2016 17:38:06 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tinkler%40vocabulary.com&quot; class=&quot;user-hover&quot; rel=&quot;tinkler@vocabulary.com&quot;&gt;tinkler@vocabulary.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;An examination of your diagnostic.data indicates that this issue occurs when application threads begin evicting pages from the cache. We have been working hard on improving the efficiency of WiredTiger cache management since the 3.2.9 release, and MongoDB 3.2.10 includes many improvements around cache eviction. For an detailed explanation of the fixes included in MongoDB 3.2.10, please review &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26055?focusedCommentId=1394968&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1394968&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt;. Would you please upgrade to MongoDB 3.2.10 and confirm if the issue is resolved?&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1392374" author="tinkler@vocabulary.com" created="Fri, 23 Sep 2016 20:35:19 +0000"  >&lt;p&gt;By the way, we downgraded our replica set to 3.2.6 and everything returned to normal.  You can see that in MMS as well.&lt;/p&gt;</comment>
                            <comment id="1392373" author="tinkler@vocabulary.com" created="Fri, 23 Sep 2016 20:34:29 +0000"  >&lt;p&gt;Sure thing, here you go.&lt;/p&gt;</comment>
                            <comment id="1392225" author="thomas.schubert" created="Fri, 23 Sep 2016 18:15:04 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tinkler%40vocabulary.com&quot; class=&quot;user-hover&quot; rel=&quot;tinkler@vocabulary.com&quot;&gt;tinkler@vocabulary.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Would you please upload an archive of &lt;tt&gt;diagnostic.data&lt;/tt&gt; directory, so we can continue to investigate?&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1392220" author="tinkler@vocabulary.com" created="Fri, 23 Sep 2016 18:06:42 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://cloud.mongodb.com/v2/4ea6b7b7ae6429bfa40fde32#host/replicaSet/5240a76ce4b0c9e4ba7e689b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://cloud.mongodb.com/v2/4ea6b7b7ae6429bfa40fde32#host/replicaSet/5240a76ce4b0c9e4ba7e689b&lt;/a&gt; for more details.&lt;/p&gt;</comment>
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                            <attachment id="139587" name="diagnostic-data.tgz" size="102061386" author="tinkler@vocabulary.com" created="Fri, 23 Sep 2016 20:34:29 +0000"/>
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