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    <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-47749] The JournalFlusher should use a WRITE_CONFLICT_RETRY_ONLY YieldPolicy for its oplog read operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-47749</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The JournalFlusher can &lt;a href=&quot;https://github.com/mongodb/mongo/blob/60ed56e7246f862c5874f6c346d1b1ec6bc948a8/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L88-L92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;hit an EBUSY error while trying to open a WT cursor&lt;/a&gt; when the validate cmd is doing WT_SESSION::verify on the same collection, local.oplog.rs. Per this WT documentation, &lt;a href=&quot;https://source.wiredtiger.com/3.1.0/error_handling.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://source.wiredtiger.com/3.1.0/error_handling.html&lt;/a&gt;, indicating that WT_SESSION::verify can run into EBUSY if unable to gain exclusive access, and apparently vice versa for trying to open a cursor while WT_SESSION::verify is running.&lt;/p&gt;

&lt;p&gt;Our query code will normally turn WCEs into yields, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/60ed56e7246f862c5874f6c346d1b1ec6bc948a8/src/mongo/db/query/plan_executor_impl.cpp#L604-L607&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, but the JournalFlusher is using an query execution plan explicitly with the NO_YIELD setting &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d7c8f19c0980713d38a975d5b546f9b051e19649/src/mongo/db/repl/storage_interface_impl.cpp#L1055&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/60ed56e7246f862c5874f6c346d1b1ec6bc948a8/src/mongo/db/query/plan_executor.h#L112-L117&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The WRITE_CONFLICT_RETRY_ONLY policy indicates that it will retry on WriteConflictExceptions without releasing locks&lt;/a&gt;. It is not desirable to yield locks for the JournalFlusher&apos;s oplog query per &lt;a href=&quot;https://github.com/mongodb/mongo/blob/60ed56e7246f862c5874f6c346d1b1ec6bc948a8/src/mongo/db/repl/replication_consistency_markers_impl.cpp#L479-L484&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this comment&lt;/a&gt; on the JournalFlusher&apos;s lock acquisitions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1328014">SERVER-47749</key>
            <summary>The JournalFlusher should use a WRITE_CONFLICT_RETRY_ONLY YieldPolicy for its oplog read operation</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Apr 2020 13:54:01 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:06 +0000</updated>
                            <resolved>Fri, 24 Apr 2020 19:01:02 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3054759" author="xgen-internal-githook" created="Fri, 24 Apr 2020 18:38:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47749&quot; title=&quot;The JournalFlusher should use a WRITE_CONFLICT_RETRY_ONLY YieldPolicy for its oplog read operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47749&quot;&gt;&lt;del&gt;SERVER-47749&lt;/del&gt;&lt;/a&gt; The JournalFlusher should use a WRITE_CONFLICT_RETRY_ONLY YieldPolicy for its oplog read operation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/73070916d377b5196d7a75528606b905f28c990b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/73070916d377b5196d7a75528606b905f28c990b&lt;/a&gt;&lt;/p&gt;</comment>
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