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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <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-36126] moveChunk fails on the source shard when receiving a NotMaster error.</title>
                <link>https://jira.mongodb.org/browse/SERVER-36126</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On a new test &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/sharding/change_stream_shard_failover.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;change_stream_shard_failover.js&lt;/a&gt;,&#160;we expose behavior with moveChunks and stepdowns. &lt;/p&gt;

&lt;p&gt;In a chunk migration:&lt;br/&gt;
When a primary node steps down from a shard during receiving a chunk, it will return a NotMaster error to the source shard. The source shard will fail the entire operations due to a NotMaster error. In the aforementioned test, it happens during a shardCollection &amp;#8211; the ReplicaSetMonitor on the source shard has outdated information as to what connection to target.&lt;/p&gt;

&lt;p&gt;In discussions with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;, we concluded that parts of moveChunk aren&apos;t retryable &amp;#8211; the protocol acts like a state machine, and we require each state to come after another specific state. For example, we can&apos;t transfer modifications before completely cloning. Additionally, if an old recipient&apos;s cloning process was still running while a new recipient stepped in, it&apos;s possible for both recipients to attempt to siphon data from the source shard. &lt;/p&gt;

&lt;p&gt;In the failures seen in the linked BF, we fail right after the cloning process begins &amp;#8211; the first step in a moveChunk. We have identified &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/migration_source_manager.cpp#L239&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;an area where we can run a loop&lt;/a&gt;, and retry on NotMaster failures. We also guarantee that the session ID will get regenerated each time, preventing an old secondary recipient from continuing with the protocol.&lt;/p&gt;
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                <environment></environment>
        <key id="571404">SERVER-36126</key>
            <summary>moveChunk fails on the source shard when receiving a NotMaster error.</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Jul 2018 17:51:02 +0000</created>
                <updated>Tue, 6 Dec 2022 03:24:13 +0000</updated>
                            <resolved>Mon, 29 Jul 2019 20:59:53 +0000</resolved>
                                    <version>3.6.6</version>
                    <version>4.0.0</version>
                    <version>4.0.1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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            <issuekey id="457331">SERVER-31922</issuekey>
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