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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-25522] Hashing of _id during application of oplog entries must respect the collation</title>
                <link>https://jira.mongodb.org/browse/SERVER-25522</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Suppose that a user issues the following operations:&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;Here the collection default collation is case-insensitive, so the expected state of the collection after these commands are issued is to be empty. The replication system, however, may distribute oplog application work on the secondary based on the hash of the &lt;tt&gt;_id&lt;/tt&gt;. This hash is currently not collation-aware. As a consequence, the two operations may get assigned to different applier workers and could get applied in the wrong order. The result would be data corruption, since the primary would have no documents, but the secondary would have the document {_id: &quot;foo&quot;}.&lt;/p&gt;

&lt;p&gt;The simplest fix is to change &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.3.10/src/mongo/db/repl/sync_tail.cpp#L572&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fillWriterVectors()&lt;/a&gt; to assign all oplog entries where the collection has a non-simple collation to the same vector.&lt;/p&gt;</description>
                <environment></environment>
        <key id="307787">SERVER-25522</key>
            <summary>Hashing of _id during application of oplog entries must respect the collation</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Aug 2016 22:58:24 +0000</created>
                <updated>Sat, 13 Aug 2016 00:07:05 +0000</updated>
                            <resolved>Thu, 11 Aug 2016 20:49:31 +0000</resolved>
                                                    <fixVersion>3.3.11</fixVersion>
                                    <component>Querying</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1354715" author="xgen-internal-githook" created="Thu, 11 Aug 2016 20:47:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25522&quot; title=&quot;Hashing of _id during application of oplog entries must respect the collation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25522&quot;&gt;&lt;del&gt;SERVER-25522&lt;/del&gt;&lt;/a&gt; ensure oplog entries applied serially to collection with non-simple collation&lt;/p&gt;

&lt;p&gt;This restriction can be relaxed pending a mechanism for&lt;br/&gt;
collation-aware hashing of BSONElement.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/afd98273f7a2d09a4b6ce29950d73f56dfaf3fc4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/afd98273f7a2d09a4b6ce29950d73f56dfaf3fc4&lt;/a&gt;&lt;/p&gt;</comment>
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