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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-25834] Make rebalance chunk requests re-entrant</title>
                <link>https://jira.mongodb.org/browse/SERVER-25834</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the &apos;rebalanceChunk&apos; form of moveChunk &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ff52022e5cd7ff7c75daf24c8760f0377785ba1e/src/mongo/s/config_server_client.cpp#L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uses the kNotIdempotent retry policy&lt;/a&gt;, while the &apos;moveChunk&apos; form &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ff52022e5cd7ff7c75daf24c8760f0377785ba1e/src/mongo/s/config_server_client.cpp#L60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uses the kIdempotent policy&lt;/a&gt;.  This makes the &apos;rebalanceChunk&apos; form less resilient to things like config server primary failovers and network errors.&lt;/p&gt;

&lt;p&gt;The only difference between these two is that one has a target shard specified and the other does not.  We should allow &apos;rebalance chunk&apos; requests, that don&apos;t have a target shard attached, to be re-run in the case of network errors, and if there&apos;s already a &apos;rebalance chunk&apos; operation in progress for that same chunk, just attach to it and return its return value when finished.&lt;/p&gt;</description>
                <environment></environment>
        <key id="312191">SERVER-25834</key>
            <summary>Make rebalance chunk requests re-entrant</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Aug 2016 22:09:04 +0000</created>
                <updated>Tue, 6 Dec 2022 04:17:59 +0000</updated>
                            <resolved>Thu, 8 Sep 2016 15:33:33 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1379577" author="schwerin" created="Thu, 8 Sep 2016 15:33:33 +0000"  >&lt;p&gt;This behavior is only used by autosplit, which is comfortable with the existing failure modes.&lt;/p&gt;</comment>
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