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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-51689] _configsvrCommitSplitChunk is not waiting for opTime on early return</title>
                <link>https://jira.mongodb.org/browse/SERVER-51689</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a command on the config server performs an early return without doing a write, it is expected that they will setLastOpToSystemLastOpTime (like &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b6a04c494f73ca267547dcd79541c0977651037f/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L621&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;commitChunkMerge&lt;/a&gt;) that way it is ensured that future reads will see the changes majority committed by previous operations.&lt;/p&gt;

&lt;p&gt;When committing a chunk split &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b6a04c494f73ca267547dcd79541c0977651037f/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L407-L409&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the original chunk is searched&lt;/a&gt;, and if not found, then an error is returned, however, the following scenario might happen:&lt;/p&gt;

&lt;p&gt;1. A _configsvrcommitSplitChunk is sent from a shard&lt;br/&gt;
2. The connection drops but the commit is successful on the primary&lt;br/&gt;
3. The command is retried but it returns early&lt;br/&gt;
4. Another split command is issued&lt;br/&gt;
5. The collection metadata &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b8017175e3ac2c6d37f60d3f4cd2efb5011d1a32/src/mongo/s/commands/cluster_split_cmd.cpp#L133&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;is refreshed&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Step 5 might not see the changes committed on 3 because if the changes haven&apos;t been majority written by the time the refresh happens, the effects of the split will not be seen on the shard if a non primary node is queried, causing a precondition failure (the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b6a04c494f73ca267547dcd79541c0977651037f/src/mongo/s/commands/cluster_split_cmd.cpp#L270&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;range&lt;/a&gt; determined on the router is the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b8017175e3ac2c6d37f60d3f4cd2efb5011d1a32/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L501-L515&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;precondition&lt;/a&gt; sent later on) on the next applyOps.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1516957">SERVER-51689</key>
            <summary>_configsvrCommitSplitChunk is not waiting for opTime on early return</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 16 Oct 2020 14:41:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:01:49 +0000</updated>
                            <resolved>Mon, 26 Oct 2020 15:24:09 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3463181" author="xgen-internal-githook" created="Mon, 26 Oct 2020 15:17:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51689&quot; title=&quot;_configsvrCommitSplitChunk is not waiting for opTime on early return&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51689&quot;&gt;&lt;del&gt;SERVER-51689&lt;/del&gt;&lt;/a&gt; _configsvrCommitSplitChunk is not waiting for opTime on early return&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c33f06f6e747049891f7cd5f5a1a7147dbb4e313&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c33f06f6e747049891f7cd5f5a1a7147dbb4e313&lt;/a&gt;&lt;/p&gt;</comment>
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