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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-55111] When using a nested shard key, a delete in a txn to a chunk that has moved is not throwing MigrationConflict</title>
                <link>https://jira.mongodb.org/browse/SERVER-55111</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55033&quot; title=&quot;OpObserverImpl should pass the shard key when calling shardObserveDeleteOp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55033&quot;&gt;&lt;del&gt;SERVER-55033&lt;/del&gt;&lt;/a&gt; there is still one situation where OpObserverShardingImpl::shardObserveDeleteOp will not throw upon attempting to delete a document in a txn on a chunk that has moved since the atClusterTime. This situation happens when the collection has a nested shard key.&lt;/p&gt;

&lt;p&gt;For instance:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/a61cd4123668010637003b52b9f4644e499c5d16/src/mongo/db/op_observer_impl.cpp#L610&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OpObserverImpl::getDocumentKey()&lt;/a&gt; calls &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a61cd4123668010637003b52b9f4644e499c5d16/src/mongo/db/op_observer_impl.cpp#L284&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dotted_path_support::extractElementsBasedOnTemplate()&lt;/a&gt; and would return an object {&quot;x.y&quot;: 10}.&lt;/p&gt;

&lt;p&gt;OpObserverShardingImpl::shardObserveDeleteOp() &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a61cd4123668010637003b52b9f4644e499c5d16/src/mongo/db/s/op_observer_sharding_impl.cpp#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls ShardKeyPattern::extractShardKeyFromDocThrows()&lt;/a&gt; which would fail to find the shard key because there is no field call &quot;x&quot; in the object {&quot;x.y&quot;: 10}. There is only a field called &quot;x.y&quot;.&lt;/p&gt;

&lt;p&gt;Possible solutions could be:&lt;br/&gt;
a) Make shardObserveDeleteOp() receive the full document, so it can call extractShardKeyFromDoc() itself. This would likely cause a performance regression since we would need to save a copy of the full document in aboutToDelete().&lt;br/&gt;
b) Make shardObserveDeleteOp() receive the shard key (without the _id, unless _id was part of the shard key pattern) so that it can skip calling extractShardKeyFromDoc*() itself. shardObserveDeleteOp() also needs to receive the _id separately so it can be given to MigrationChunkClonerSourceLegacy::onDeleteOp()&lt;br/&gt;
c) Make OpObserverImpl::getDocumentKey set the shard key BSONObj as nested object (if the shard key was nested), instead of setting it as dot-notation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1645261">SERVER-55111</key>
            <summary>When using a nested shard key, a delete in a txn to a chunk that has moved is not throwing MigrationConflict</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Wed, 10 Mar 2021 08:52:28 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:27 +0000</updated>
                            <resolved>Mon, 17 May 2021 08:04:09 +0000</resolved>
                                    <version>4.9.0-alpha4</version>
                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3775897" author="xgen-internal-githook" created="Mon, 17 May 2021 07:59:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55111&quot; title=&quot;When using a nested shard key, a delete in a txn to a chunk that has moved is not throwing MigrationConflict&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55111&quot;&gt;&lt;del&gt;SERVER-55111&lt;/del&gt;&lt;/a&gt; When using a nested shard key, a delete in a txn to a chunk that has moved is not throwing MigrationConflict&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/98b60eb0d7a1f7d46415a358378fef1e862d3d32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/98b60eb0d7a1f7d46415a358378fef1e862d3d32&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1643263">SERVER-55033</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1681185">SERVER-56127</issuekey>
        </issuelink>
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