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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-72413] Split may return an error when it is actually committed</title>
                <link>https://jira.mongodb.org/browse/SERVER-72413</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A split might return an error if the command &lt;tt&gt;_configsvrCommitChunkSplit&lt;/tt&gt; fails waiting for majority when the split was already committed.&lt;/p&gt;

&lt;p&gt;Here is an example of when this can happen:&lt;/p&gt;

&lt;p&gt;1) A split is requested to mongos and it&apos;s resending it to the shard chunk owner.&lt;br/&gt;
2) The &lt;a href=&quot;https://github.com/10gen/mongo/blob/d5209179dc52ac6411f8fcacb1b9405fe617d8a5/src/mongo/db/s/split_chunk.cpp#L240-L246&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shard issues a &lt;tt&gt;_configsvrCommitChunkSplit&lt;/tt&gt; to the config server&lt;/a&gt;.&lt;br/&gt;
3) The &lt;b&gt;config server steps down when the commit was already committed&lt;/b&gt; but was still waiting for majority write.&lt;br/&gt;
4) The shard receives an &lt;tt&gt;InterruptedDueToReplStateChange&lt;/tt&gt; error from the CS and &lt;a href=&quot;https://github.com/10gen/mongo/blob/d5209179dc52ac6411f8fcacb1b9405fe617d8a5/src/mongo/db/s/split_chunk.cpp#L279-L284&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checks if the split was actually committed&lt;/a&gt; after &lt;a href=&quot;https://github.com/10gen/mongo/blob/d5209179dc52ac6411f8fcacb1b9405fe617d8a5/src/mongo/db/s/split_chunk.cpp#L263&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refreshing&lt;/a&gt; its cache.&lt;br/&gt;
5) Since the refresh may be done against a config server node that still doesn&apos;t have the latest chunk version, so the shard still believes that the split was not done and retries the command &lt;tt&gt;_configsvrCommitChunkSplit&lt;/tt&gt;.&lt;br/&gt;
6) The new config server primary node fails &lt;a href=&quot;https://github.com/10gen/mongo/blob/82c46f01769d6cbae70a27ff948b0d93c49f7420/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L464-L470&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; on this &lt;a href=&quot;https://github.com/10gen/mongo/blob/82c46f01769d6cbae70a27ff948b0d93c49f7420/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L157-L170&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;query&lt;/a&gt; because the split was actually done.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2220726">SERVER-72413</key>
            <summary>Split may return an error when it is actually committed</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="13201">Fixed</resolution>
                                        <assignee username="silvia.surroca@mongodb.com">Silvia Surroca</assignee>
                                    <reporter username="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Wed, 28 Dec 2022 18:25:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:28:50 +0000</updated>
                            <resolved>Thu, 29 Dec 2022 18:58:37 +0000</resolved>
                                    <version>6.1.0-rc4</version>
                    <version>6.2.0-rc4</version>
                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5082057" author="xgen-internal-githook" created="Thu, 29 Dec 2022 18:55:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Silvia Surroca&apos;, &apos;email&apos;: &apos;silvia.surroca@mongodb.com&apos;, &apos;username&apos;: &apos;silviasuhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72413&quot; title=&quot;Split may return an error when it is actually committed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72413&quot;&gt;&lt;del&gt;SERVER-72413&lt;/del&gt;&lt;/a&gt; Split may return an error when it is actually committed&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e836af153c045bee380646c9c8f3715cabfe73ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e836af153c045bee380646c9c8f3715cabfe73ed&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5081608" author="JIRAUSER1268536" created="Thu, 29 Dec 2022 15:07:56 +0000"  >&lt;p&gt;Requesting backport to v6.2 since bug was introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65838&quot; title=&quot;Remove applyOpsDeprecated usage from split/merge chunk functions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65838&quot;&gt;&lt;del&gt;SERVER-65838&lt;/del&gt;&lt;/a&gt; in v6.1 without backports&lt;/p&gt;</comment>
                            <comment id="5081444" author="JIRAUSER1268536" created="Thu, 29 Dec 2022 13:37:27 +0000"  >&lt;p&gt;The issue was caused by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65838&quot; title=&quot;Remove applyOpsDeprecated usage from split/merge chunk functions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65838&quot;&gt;&lt;del&gt;SERVER-65838&lt;/del&gt;&lt;/a&gt; because, moving from &lt;tt&gt;applyOps&lt;/tt&gt; to internal transactions, we stopped updating to the &lt;tt&gt;lastOpTime&lt;/tt&gt; when the &lt;a href=&quot;https://github.com/10gen/mongo/blob/82c46f01769d6cbae70a27ff948b0d93c49f7420/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L464-L470&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;split precondition&lt;/a&gt; fails. &lt;tt&gt;applyOps&lt;/tt&gt; was implicitly updating to the lastOpTime of the &lt;tt&gt;opCtx&lt;/tt&gt;, while the transaction doesn&apos;t if it fails.&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65838&quot; title=&quot;Remove applyOpsDeprecated usage from split/merge chunk functions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65838&quot;&gt;&lt;del&gt;SERVER-65838&lt;/del&gt;&lt;/a&gt; was introduced in v6.1.&lt;/p&gt;

&lt;p&gt;However, the error started appearing after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71649&quot; title=&quot;Transaction API shouldn&amp;#39;t block on an uncancelable operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71649&quot;&gt;&lt;del&gt;SERVER-71649&lt;/del&gt;&lt;/a&gt; because it reduces the time waiting a transaction abort.&lt;/p&gt;
</comment>
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