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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-82617] Router&apos;s fsyncLock command must be resilient to elections</title>
                <link>https://jira.mongodb.org/browse/SERVER-82617</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When &lt;tt&gt;fsyncLock&lt;/tt&gt; is invoked on a router, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8ec39f47140c8d97a6f64bf8ec5d5402437bb7b9/src/mongo/s/commands/cluster_fsync_cmd.cpp#L115-L121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;it contacts the primary of every shard&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/commands/fsync.cpp#L197&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;makes sure there are no ongoing DDLs&lt;/a&gt; in order not to incur in inconsistencies during backups. This protocol is currently not resilient to elections.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Exampleofbreakingscenario&quot;&gt;&lt;/a&gt;Example of breaking scenario&lt;/h4&gt;
&lt;p&gt;Let&apos;s consider a shard with 3 nodes: &lt;b&gt;n0&lt;/b&gt;, &lt;b&gt;n1&lt;/b&gt; and &lt;b&gt;n2&lt;/b&gt;. The primary was &lt;b&gt;n0&lt;/b&gt; but just switched to &lt;b&gt;n1&lt;/b&gt;.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The router believes &lt;b&gt;n0&lt;/b&gt; is primary, asks to acquire the fsync lock&lt;/li&gt;
	&lt;li&gt;Since the command &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8ec39f47140c8d97a6f64bf8ec5d5402437bb7b9/src/mongo/db/commands/fsync.cpp#L303-L305&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is allowed on secondaries&lt;/a&gt;, &lt;b&gt;n0&lt;/b&gt; acquires the lock and returns successfully&lt;/li&gt;
	&lt;li&gt;A DDL starts on &lt;b&gt;n1&lt;/b&gt; since the coordinator document can be majority committed replicating to &lt;b&gt;n2&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;Backup starts from &lt;b&gt;n1&lt;/b&gt; or &lt;b&gt;n2&lt;/b&gt;&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2486521">SERVER-82617</key>
            <summary>Router&apos;s fsyncLock command must be resilient to elections</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="nandini.bhartiya@mongodb.com">Nandini Bhartiya</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>cs-subteam1</label>
                            <label>sharding-nyc-subteam1</label>
                    </labels>
                <created>Tue, 31 Oct 2023 14:31:13 +0000</created>
                <updated>Tue, 12 Dec 2023 17:05:13 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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