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    <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-80853] $out on secondary node can produce incorrect results if primary steps down</title>
                <link>https://jira.mongodb.org/browse/SERVER-80853</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1. $out starts on a secondary. It creates a `temp` collection and starts writing to it.&lt;br/&gt;
2. Election happens and a new primary steps up. On stepup `temp` collections are &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5ca180e1b8d8f856dc4600206d5d65ef01f96b8b/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L569&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dropped&lt;/a&gt;.&lt;br/&gt;
3. $out on the secondary continues running and will start &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5ca180e1b8d8f856dc4600206d5d65ef01f96b8b/src/mongo/db/pipeline/process_interface/replica_set_node_process_interface.cpp#L101&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;targeting upcoming inserts to the new primary&lt;/a&gt;.&lt;br/&gt;
4. Since the `temp` collection has been dropped on step (2), the write at (3) will implicitly recreate it.&lt;br/&gt;
5. $out finishes successfully, but documents written before step (2) are missing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2436277">SERVER-80853</key>
            <summary>$out on secondary node can produce incorrect results if primary steps down</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="10018" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Code Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="parker.felix@mongodb.com">Parker Felix</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Sep 2023 10:32:26 +0000</created>
                <updated>Tue, 16 Jan 2024 22:04:08 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5750226" author="kateryna.kamenieva" created="Tue, 3 Oct 2023 21:16:53 +0000"  >&lt;p&gt;The issue is that the failure is not reported. It looks like a successful operation to the user. It should produce an error.&lt;/p&gt;</comment>
                            <comment id="5749615" author="mihai.andrei" created="Tue, 3 Oct 2023 18:18:39 +0000"  >&lt;p&gt;Note that this was a known limitation when this feature was implemented during the 4.4 release cycle. From the &lt;a href=&quot;https://docs.google.com/document/d/1-goesKF0S-ED84NIETd96yLGxwY4Op9lG7NCVZfU2jM/edit#heading=h.sye21yee6q34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;scope&lt;/a&gt;:&lt;br/&gt;
&amp;gt;&#160;Allow $out or $merge to survive stepdowns. These operations may still fail with a NotMaster error if a stepdown occurs during execution.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="665876">SERVER-38852</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="918697">SERVER-43198</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2309978">SERVER-75856</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                            <attachment id="474111" name="0001-Repro-SERVER-80853.patch" size="5709" author="jordi.serra-torrens@mongodb.com" created="Thu, 7 Sep 2023 10:33:54 +0000"/>
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