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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-32547] Mongo stalls while evicting dirty cache</title>
                <link>https://jira.mongodb.org/browse/SERVER-32547</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We are having an issue where mongo becomes unresponsive for minutes at a time. During this period it is emptying the dirty cache.&lt;/p&gt;

&lt;p&gt;The pattern we are seeing is that during normal operation performance is generally acceptable. However we have a large amount of data we want to delete from the cluster and starting that deletion process triggers the stalling behavior. Once this behavior starts it seems to reappear even after we&apos;ve stopped the deletions. Restarting the server processes causes the problem to go away until we start the deletions again.&lt;/p&gt;

&lt;p&gt;I&apos;m uncertain if this is related but we previously had an issue (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31141&quot; title=&quot;Poor performance with 95% cache and many writers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31141&quot;&gt;&lt;del&gt;SERVER-31141&lt;/del&gt;&lt;/a&gt;) with stalls when the disk cache reached the 95% threshold but &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3079&quot; title=&quot;Make sure eviction visits all trees&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3079&quot;&gt;&lt;del&gt;WT-3079&lt;/del&gt;&lt;/a&gt; appeared to fix that issue.&lt;/p&gt;

&lt;p&gt;I have logs and diagnostic data I can add to the upload portal.&lt;/p&gt;

&lt;p&gt;Let me know if any other information would be helpful.&lt;/p&gt;</description>
                <environment></environment>
        <key id="478899">SERVER-32547</key>
            <summary>Mongo stalls while evicting dirty cache</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="3">Duplicate</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="bpot">Bob Potter</reporter>
                        <labels>
                            <label>RF</label>
                    </labels>
                <created>Thu, 4 Jan 2018 20:38:48 +0000</created>
                <updated>Fri, 9 Feb 2018 18:51:44 +0000</updated>
                            <resolved>Thu, 18 Jan 2018 22:19:17 +0000</resolved>
                                    <version>3.6.1</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1778418" author="thomas.schubert" created="Thu, 18 Jan 2018 22:19:09 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bpot&quot; class=&quot;user-hover&quot; rel=&quot;bpot&quot;&gt;bpot&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for uploading the diagnostic.data; it was invaluable to diagnosis this issue. The issue you are encountering is described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32139&quot; title=&quot;Oplog truncation creates large amount of dirty data in cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32139&quot;&gt;&lt;del&gt;SERVER-32139&lt;/del&gt;&lt;/a&gt; and will be resolved when &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3805&quot; title=&quot;Avoid reading lookaside pages in truncate fast path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3805&quot;&gt;&lt;del&gt;WT-3805&lt;/del&gt;&lt;/a&gt; is completed. Please feel free to review these tickets for additional information and watch the tickets for updates.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1765565" author="bpot" created="Thu, 4 Jan 2018 22:05:30 +0000"  >&lt;p&gt;Data is uploaded.&lt;/p&gt;</comment>
                            <comment id="1765551" author="thomas.schubert" created="Thu, 4 Jan 2018 21:57:18 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bpot&quot; class=&quot;user-hover&quot; rel=&quot;bpot&quot;&gt;bpot&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for opening a new ticket describing this issue. I&apos;ve created a secure &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/caf0985d-f0ac-4a7c-9c42-fc32a1f2c579.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upload portal&lt;/a&gt; for you to provide the files.&lt;/p&gt;

&lt;p&gt;Thanks again,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
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                            <issuelinktype id="10012">
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                <attachments>
                            <attachment id="174760" name="SERVER-32547_oplog_trunc.png" size="95661" author="neha.khatri" created="Fri, 5 Jan 2018 05:03:36 +0000"/>
                            <attachment id="175898" name="Screen Shot 2018-01-15 at 5.18.20 pm.png" size="70304" author="alexander.gorrod@mongodb.com" created="Mon, 15 Jan 2018 06:18:43 +0000"/>
                            <attachment id="174741" name="lookaside.png" size="294705" author="kelsey.schubert@mongodb.com" created="Thu, 4 Jan 2018 22:31:31 +0000"/>
                            <attachment id="174779" name="question.png" size="360759" author="bruce.lucas@mongodb.com" created="Fri, 5 Jan 2018 15:56:28 +0000"/>
                            <attachment id="174759" name="t2-initial-look.png" size="97739" author="sulabh.mahajan@mongodb.com" created="Fri, 5 Jan 2018 04:48:33 +0000"/>
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