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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-51512] cache evict problem</title>
                <link>https://jira.mongodb.org/browse/SERVER-51512</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MongoDB version: 4.2, replica set&lt;br/&gt;
 Problem: primary node cache evict not work.&lt;/p&gt;

&lt;p&gt;The user&apos;s write operations were blocked because of the wiredTiger write ticket runs out. At 2020-10-07 01:24, the user inserts traffic increase so the CPU usage, dirty cache, and some metrics increase(the dirty cache percentage &amp;gt; 20%). And some slow log generated. However, after 01:27, there is almost no traffic, but the write ticket, CPU, dirty cache, WiredTiger hazard point check entry walked are still abnormal. It looks like the cache evict is not work, but as we look at the CPU profiling, the evict threads were still running.&lt;/p&gt;

&lt;p&gt;This situation was resolved at about 10-07 18:00 when the replica set restarted.&lt;/p&gt;

&lt;p&gt;We also attach the log which is not the raw log but collected by our log gathering platform because the raw log is rotated.&lt;/p&gt;

&lt;p&gt;Please let me known if you guys want more information.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1512227">SERVER-51512</key>
            <summary>cache evict problem</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="dmitry.agranat@mongodb.com">Dmitry Agranat</assignee>
                                    <reporter username="cvinllen@gmail.com">vinllen chen</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Oct 2020 04:03:09 +0000</created>
                <updated>Sun, 25 Oct 2020 15:34:01 +0000</updated>
                            <resolved>Sun, 25 Oct 2020 15:34:01 +0000</resolved>
                                                                    <component>Concurrency</component>
                    <component>Performance</component>
                    <component>Stability</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3462525" author="dmitry.agranat" created="Sun, 25 Oct 2020 15:33:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cvinllen%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;cvinllen@gmail.com&quot;&gt;cvinllen@gmail.com&lt;/a&gt;, we are actively discussing adding the fix to one of our future 4.2 and/or 4.0 minor releases. I suggest watching &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50365&quot; title=&quot;Stuck with long-running transactions that can&amp;#39;t be timed out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50365&quot;&gt;&lt;del&gt;SERVER-50365&lt;/del&gt;&lt;/a&gt; for updates.&lt;/p&gt;</comment>
                            <comment id="3453308" author="cvinllen@gmail.com" created="Tue, 20 Oct 2020 01:39:32 +0000"  >&lt;p&gt;Thanks for your reply, it looks like this patch will backport to v4.0 and v4.2, but the fix versions are not including version &amp;lt; v4.4. Is there any plan?&lt;br/&gt;
&#160;&lt;/p&gt;</comment>
                            <comment id="3441421" author="dmitry.agranat" created="Tue, 13 Oct 2020 08:35:12 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cvinllen%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;cvinllen@gmail.com&quot;&gt;cvinllen@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;It looks like you are hitting &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50365&quot; title=&quot;Stuck with long-running transactions that can&amp;#39;t be timed out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50365&quot;&gt;&lt;del&gt;SERVER-50365&lt;/del&gt;&lt;/a&gt;. In addition, I believe that all the custom parameters you are using plus the very small cache size (and a heavy write workload in question) makes things even worse. Whenever you decide to upgrade to take advantage of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50365&quot; title=&quot;Stuck with long-running transactions that can&amp;#39;t be timed out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50365&quot;&gt;&lt;del&gt;SERVER-50365&lt;/del&gt;&lt;/a&gt;, I recommend testing with all the default parameters and a larger cache size.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
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