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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-83186] Writers can get stuck in cache eviction without rolling back transactions in order to make progress</title>
                <link>https://jira.mongodb.org/browse/SERVER-83186</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For a workload with many threads performing medium-sized writes (unlike &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61909&quot; title=&quot;Hang inserting or deleting document with large number of index entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61909&quot;&gt;&lt;del&gt;SERVER-61909&lt;/del&gt;&lt;/a&gt; where there is a single large transaction which cannot fit in cache), especially one with prepared transactions since those cannot be rolled back, we can end up in a scenario where eviction cannot make meaningful progress. The threads performing the writes are being co-opted into performing eviction and cannot return until sufficient eviction progress is made, so they can essentially all become stuck as a result.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2498588">SERVER-83186</key>
            <summary>Writers can get stuck in cache eviction without rolling back transactions in order to make progress</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Nov 2023 18:52:39 +0000</created>
                <updated>Tue, 14 Nov 2023 16:43:48 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5876662" author="louis.williams" created="Mon, 13 Nov 2023 19:28:37 +0000"  >&lt;p&gt;This is not the same problem as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51281&quot; title=&quot;mongod live locked&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51281&quot;&gt;&lt;del&gt;SERVER-51281&lt;/del&gt;&lt;/a&gt;, but it does have the same symptoms. It&apos;s a system-wide stall where all threads are stuck in cache eviction. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51281&quot; title=&quot;mongod live locked&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51281&quot;&gt;&lt;del&gt;SERVER-51281&lt;/del&gt;&lt;/a&gt; was caused by the fact that we were using multiple WT sessions on the same thread, as described more generally by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61116&quot; title=&quot;Audit and add assertions against using multiple WT_SESSIONs on the same thread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61116&quot;&gt;SERVER-61116&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This ticket does not describe a full stall that grinds the system to a halt. The system is still making progress, just very slowly. There are a set of problems that culminate in this behavior. Firstly, once operations are stuck inside WiredTiger, we can&apos;t kill them. The other problem is our load-shedding in this state is very limited.&lt;/p&gt;</comment>
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            <issuekey id="2010139">SERVER-64982</issuekey>
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            <issuelink>
            <issuekey id="1027888">SERVER-44870</issuekey>
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            <issuekey id="1918423">SERVER-61251</issuekey>
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