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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31446] _getNextSessionMods can get stuck in a write conflict retry loop</title>
                <link>https://jira.mongodb.org/browse/SERVER-31446</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1. Shard receives _getNextSessionMods command.&lt;br/&gt;
2. Command tries to query oplog and hits a WriteConflictException&lt;br/&gt;
3. QueryYield::yieldAllLocks is called, but it returns early because it&apos;s using &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.13/src/mongo/db/concurrency/lock_state.cpp#L595-L600&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DBDirectClient&lt;/a&gt; so it does not &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.13/src/mongo/db/query/query_yield.cpp#L67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;throw away the snapshot&lt;/a&gt; (Note: First global lock is taken by AutoGetActiveCloner).&lt;br/&gt;
4. Query loop retries, but since it never resets the state during yield, it gets a WCE again, so step#2 is repeated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="441765">SERVER-31446</key>
            <summary>_getNextSessionMods can get stuck in a write conflict retry loop</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="13201">Fixed</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Oct 2017 18:31:19 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:00 +0000</updated>
                            <resolved>Thu, 2 Nov 2017 19:27:32 +0000</resolved>
                                                    <fixVersion>3.6.0-rc3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1715836" author="xgen-internal-githook" created="Thu, 2 Nov 2017 19:23:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;username&apos;: &apos;renctan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31446&quot; title=&quot;_getNextSessionMods can get stuck in a write conflict retry loop&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31446&quot;&gt;&lt;del&gt;SERVER-31446&lt;/del&gt;&lt;/a&gt; _getNextSessionMods can get stuck in a write conflict retry loop&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cea82bc2f6e30169421b7896d23b951baa3b96ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cea82bc2f6e30169421b7896d23b951baa3b96ed&lt;/a&gt;&lt;/p&gt;</comment>
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