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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-30970] Don&apos;t allow single-updates that aren&apos;t targetted on the shard key</title>
                <link>https://jira.mongodb.org/browse/SERVER-30970</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Single document updates usually need to specify an exact match on the shard key to be allowed, so that mongos knows it can send it to a single shard and be guaranteed to only update a single document.  If, however, your shard key doesn&apos;t include _id, we allow you to do a single update that matches on _id but not the shard key.  This will result in sending the write to all shards, with the expectation that only one shard will contain a document with that _id.  Since we don&apos;t enforce uniqueness of _id in a sharded cluster that&apos;s not sharded on _id, however, that assumption is incorrect and a single update could in fact wind up updating multiple unrelated documents.&lt;/p&gt;</description>
                <environment></environment>
        <key id="424145">SERVER-30970</key>
            <summary>Don&apos;t allow single-updates that aren&apos;t targetted on the shard key</summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>LamontN</label>
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                <created>Wed, 6 Sep 2017 18:13:43 +0000</created>
                <updated>Tue, 12 Dec 2023 15:55:36 +0000</updated>
                                                                            <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1665896" author="spencer" created="Wed, 6 Sep 2017 18:14:54 +0000"  >&lt;p&gt;This can also cause updates to orphaned documents left behind by failed chunk migrations, which can result in spurious change stream notifications.&lt;/p&gt;</comment>
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            <issuekey id="148719">SERVER-14669</issuekey>
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