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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-27315] Mongo wt cache will not be reclaimed</title>
                <link>https://jira.mongodb.org/browse/SERVER-27315</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At 18:15 this time point, wt cache continues to grow until 96%. then at 19:00, we switch primary to secondary.&lt;br/&gt;
Since then, this mongo service almost without any request, but the wt cache is not recovered, has remained at around 92%.&lt;br/&gt;
I guess some reason is that the cache can not be recycled.&lt;/p&gt;

&lt;p&gt;System environment&lt;br/&gt;
System: CentOS release 6.6&lt;br/&gt;
Kernel: 2.6.32-504.el6.x86_64&lt;br/&gt;
Memory: 256G&lt;br/&gt;
Disk: SSD-PCIE&lt;br/&gt;
File System: xfs&lt;br/&gt;
mongo version:  3.2.9&lt;br/&gt;
Config:&lt;/p&gt;

&lt;p&gt;Storage:&lt;br/&gt;
   DbPath: &quot;/ mongo / db&quot;&lt;br/&gt;
   DirectoryPerDB: true&lt;br/&gt;
   Engine: wiredTiger&lt;br/&gt;
   WiredTiger:&lt;br/&gt;
     EngineConfig:&lt;br/&gt;
       CacheSizeGB: 200&lt;br/&gt;
       JournalCompressor: none&lt;br/&gt;
     CollectionConfig:&lt;br/&gt;
       BlockCompressor: snappy&lt;br/&gt;
Security:&lt;br/&gt;
   KeyFile: &quot;/ mongo / mongodb-keyfile&quot;&lt;/p&gt;</description>
                <environment>CentOS release 6.6&lt;br/&gt;
</environment>
        <key id="336927">SERVER-27315</key>
            <summary>Mongo wt cache will not be reclaimed</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="13202">Works as Designed</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="ufozhangliang@163.com">liangzhang</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Dec 2016 11:26:38 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:38 +0000</updated>
                            <resolved>Tue, 13 Dec 2016 22:08:07 +0000</resolved>
                                    <version>3.2.9</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1458030" author="thomas.schubert" created="Wed, 14 Dec 2016 16:46:19 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Please note that SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-users group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-users group.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1457176" author="ufozhangliang@163.com" created="Wed, 14 Dec 2016 05:26:52 +0000"  >&lt;p&gt;What causes eviction to be so busy. Is a lot of update, find, findandmodify or any other reason? How can I optimize to reduce the eviction workload?&lt;/p&gt;</comment>
                            <comment id="1456961" author="thomas.schubert" created="Tue, 13 Dec 2016 22:08:07 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We&apos;ve examined the diagnostic.data you&apos;ve provided. It appears that even after the node steps down to secondary it is still under considerable load. Additionally, we see that eviction is busy working under this workload. In this case, it is expected that the secondary would continue to use cache and CPU resources.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1452087" author="ufozhangliang@163.com" created="Thu, 8 Dec 2016 04:05:08 +0000"  >&lt;p&gt;Thank you for your reply, I hope you can help me solve my problems.&lt;/p&gt;</comment>
                            <comment id="1451324" author="thomas.schubert" created="Wed, 7 Dec 2016 15:58:40 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ufozhangliang%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;ufozhangliang@163.com&quot;&gt;ufozhangliang@163.com&lt;/a&gt;,&lt;/p&gt;

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

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="145981" name="QQ&#22270;&#29255;20161214132506.png" size="127393" author="ufozhangliang@163.com" created="Wed, 14 Dec 2016 05:26:28 +0000"/>
                            <attachment id="145799" name="Screen Shot 2016-12-12 at 9.50.42 am.png" size="159971" author="alexander.gorrod@mongodb.com" created="Sun, 11 Dec 2016 22:52:22 +0000"/>
                            <attachment id="145542" name="diagnostic.data.tgz" size="97769870" author="ufozhangliang@163.com" created="Thu, 8 Dec 2016 04:04:57 +0000"/>
                            <attachment id="145479" name="page evicted.png" size="48373" author="ufozhangliang@163.com" created="Wed, 7 Dec 2016 11:26:04 +0000"/>
                            <attachment id="145478" name="page passed.png" size="66222" author="ufozhangliang@163.com" created="Wed, 7 Dec 2016 11:26:11 +0000"/>
                            <attachment id="145477" name="page split.png" size="59906" author="ufozhangliang@163.com" created="Wed, 7 Dec 2016 11:26:33 +0000"/>
                            <attachment id="145480" name="wt_cache.png" size="69057" author="ufozhangliang@163.com" created="Wed, 7 Dec 2016 11:13:52 +0000"/>
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