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            <title>[SERVER-60543] Change streams can output events in a different order for multi shard transactions</title>
                <link>https://jira.mongodb.org/browse/SERVER-60543</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Changestreams orders events from txn by the clusterTime of the commitTransaction. But the order of when commit transaction occurs in shard is orthogonal to the order of when individual ops where issued. For example, in the case of changing the shard key of a document. This will involve deleting document on shardA and inserting the document with the new shard key on shardB under a single transaction. It is possible that commit can happen on shardB first, resulting in the change streams showing the insert first instead of the delete.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1892889">SERVER-60543</key>
            <summary>Change streams can output events in a different order for multi shard transactions</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
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                <created>Thu, 7 Oct 2021 18:41:20 +0000</created>
                <updated>Tue, 6 Dec 2022 00:53:15 +0000</updated>
                            <resolved>Fri, 8 Oct 2021 14:26:06 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4112916" author="renctan" created="Fri, 8 Oct 2021 14:38:50 +0000"  >&lt;p&gt;It turns out that the document key for change streams give you _id + shard key. So even if the insert came before the delete, they will have different document key (since shard key was changed). That means that consumer of change stream can use this information so it won&apos;t accidentally delete the document with the new shard key.&lt;/p&gt;</comment>
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