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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-32113] movePrimary can cause retryable writes to the collection moved applied twice</title>
                <link>https://jira.mongodb.org/browse/SERVER-32113</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Unlike moveChunk, movePrimary does not transfer the transaction history when cloning the unsharded collection to the new destination. This means that if a retryable write is applied on the original shard, the record of it being written will not be transferred to the new shard it is being moved to.&lt;/p&gt;

&lt;p&gt;To get around this bug, either:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;don&apos;t use movePrimary if your application wants to use retryable writes on unsharded collection.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;or&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Before calling movePrimary, make sure that there are no ongoing retryable writes to unsharded collection and after calling movePrimary, make sure to start a new session before attempting to do a retryable write.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="465428">SERVER-32113</key>
            <summary>movePrimary can cause retryable writes to the collection moved applied twice</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="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>max-triage</label>
                            <label>pm-1051-legacy-tickets</label>
                    </labels>
                <created>Wed, 29 Nov 2017 18:02:08 +0000</created>
                <updated>Tue, 12 Dec 2023 15:56:30 +0000</updated>
                                            <version>3.6.0-rc6</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1737670" author="kaloian.manassiev" created="Wed, 29 Nov 2017 18:54:57 +0000"  >&lt;p&gt;Agreed. If &lt;tt&gt;movePrimary&lt;/tt&gt; was using the regular chunk migration protocol, the transactions information would be transferred properly. Because of this I am moving this ticket under the general &apos;Collection Lifecycle&apos; improvements project.&lt;/p&gt;</comment>
                            <comment id="1737623" author="dan@10gen.com" created="Wed, 29 Nov 2017 18:22:35 +0000"  >&lt;p&gt;Agreed.  The &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/movePrimary/index.html#considerations&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation&lt;/a&gt; states: &lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;Avoid accessing an un-sharded collection during migration. movePrimary does not prevent reading and writing during its operation, and such actions yield undefined behavior.&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="1737612" author="schwerin" created="Wed, 29 Nov 2017 18:12:22 +0000"  >&lt;p&gt;I think we&apos;re better off considering this a bug with &quot;move primary&quot;. It&apos;s already not safe to move a primary while writes are happening.&lt;/p&gt;</comment>
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