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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-31943] Two documents can share the same documentKey when using a non-simple collation.</title>
                <link>https://jira.mongodb.org/browse/SERVER-31943</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a collection with a non-default collation is sharded the chunks are arranged, migrated and targeted using the simple collation. This can mean that two documents that have identical shard keys according to the collation can live on different shards. For example, when using a case-insensitive collation, the chunk containing the shard key &quot;abc&quot; can live on a different shard than the chunk containing the shard key &quot;ABC&quot; - even though these two documents might be considered equal when using the case-insensitive collation. This means that the combination of shardKey and _id is not unique, since there is nothing to enforce that a document with shard key &quot;ABC&quot; has a different _id than the document with shard key &quot;abc&quot;.&lt;/p&gt;

&lt;p&gt;See the attached repro.js for an example of the impact of this - a non-multi write will update two documents.&lt;/p&gt;</description>
                <environment></environment>
        <key id="458029">SERVER-31943</key>
            <summary>Two documents can share the same documentKey when using a non-simple collation.</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="3">Duplicate</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Nov 2017 19:43:42 +0000</created>
                <updated>Mon, 20 Nov 2017 18:16:59 +0000</updated>
                            <resolved>Mon, 20 Nov 2017 18:16:59 +0000</resolved>
                                                                    <component>Querying</component>
                    <component>Sharding</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1730603" author="david.storch" created="Mon, 20 Nov 2017 18:16:00 +0000"  >&lt;p&gt;This is a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30970&quot; title=&quot;Don&amp;#39;t allow single-updates that aren&amp;#39;t targetted on the shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30970&quot;&gt;SERVER-30970&lt;/a&gt;. While it is true that the attached &lt;tt&gt;repro.js&lt;/tt&gt; script has a non-multi write which updates two documents, this is only possible due to the targeting behavior described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30970&quot; title=&quot;Don&amp;#39;t allow single-updates that aren&amp;#39;t targetted on the shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30970&quot;&gt;SERVER-30970&lt;/a&gt;. Namely, the update targeting code is willing to scatter a non-multi update to all shards so long as it is update-by-_id. This is done under the assumption that the &lt;tt&gt;_id&lt;/tt&gt; field is globally unique&#8212;an assumption that is simply unsound. The repro script creates a document with &lt;tt&gt;_id:0&lt;/tt&gt; on two different shards, which goes unchecked by the system.&lt;/p&gt;

&lt;p&gt;The fact that documents with the shard key &quot;abc&quot; and &quot;ABC&quot; can live on different shards when the collection has the case-insensitive default collation is not a bug. No matter what the collection&apos;s default collation is, the shard key is required to have the simple collation. This is enforced by the &lt;tt&gt;shardCollection&lt;/tt&gt; command, and is documented here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/shardCollection/#collation&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/command/shardCollection/#collation&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Under the simple collation, the strings &quot;abc&quot; and &quot;ABC&quot; are unequal, and therefore are permitted to reside on different shards.&lt;/p&gt;</comment>
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            <issuekey id="424145">SERVER-30970</issuekey>
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                            <attachment id="170802" name="repro.js" size="2174" author="charlie.swanson@mongodb.com" created="Mon, 13 Nov 2017 19:36:15 +0000"/>
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                            <customfieldvalue>&lt;p&gt;Download the attached &apos;repro.js&apos;, and run&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&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;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;python buildscripts/resmoke.py repro.js&lt;/span&gt;&lt;/pre&gt;
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