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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-51805] Split Chunk operation is not idempotent</title>
                <link>https://jira.mongodb.org/browse/SERVER-51805</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now we assume that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/split_chunk.cpp#L169-L175&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the split chunk operation on the config server is idempotent&lt;/a&gt; , but in fact it is not: depending on where we fail, we may be able to recover from it or not.&lt;/p&gt;

&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/184e8acc583a9ee8fd9b928138c3b79bb9416cc2/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L364&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commitChunkSplit method&lt;/a&gt; triggered by a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/184e8acc583a9ee8fd9b928138c3b79bb9416cc2/src/mongo/db/s/config/configsvr_split_chunk_command.cpp#L114-L120&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_configsvrCommitChunkSplit&lt;/a&gt; command is executing the following steps:&lt;br/&gt;
1) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/184e8acc583a9ee8fd9b928138c3b79bb9416cc2/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L518-L528&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Apply the batch of chunk updates&lt;/a&gt;&lt;br/&gt;
2) Execute &lt;a href=&quot;https://github.com/mongodb/mongo/blob/184e8acc583a9ee8fd9b928138c3b79bb9416cc2/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L564&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getShardAndCollectionVersion&lt;/a&gt; - resulting in an exhaustive on the config primary.&lt;/p&gt;

&lt;p&gt;If a stepdown happens right after 1 and before 2, the operation will be retried (at most 3 times) and will fail, even though the &lt;em&gt;splitChunk&lt;/em&gt; technically happened upon the first &lt;a href=&quot;https://github.com/mongodb/mongo/blob/184e8acc583a9ee8fd9b928138c3b79bb9416cc2/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L518-L528&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;applyChunkOpsDeprecated&lt;/a&gt; successful execution.&lt;/p&gt;

</description>
                <environment></environment>
        <key id="1522264">SERVER-51805</key>
            <summary>Split Chunk operation is not idempotent</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Oct 2020 08:10:32 +0000</created>
                <updated>Tue, 6 Dec 2022 02:02:04 +0000</updated>
                            <resolved>Thu, 22 Oct 2020 14:42:06 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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