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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-43851] Work around zombie writes in $merge tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-43851</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38852&quot; title=&quot;Failing $merge can leave zombie writes in the cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38852&quot;&gt;SERVER-38852&lt;/a&gt; describes an issue which will be difficult to fix but is causing some test failures. We should work around those test failures in the meantime.&lt;/p&gt;</description>
                <environment></environment>
        <key id="960278">SERVER-43851</key>
            <summary>Work around zombie writes in $merge tests</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Oct 2019 21:07:04 +0000</created>
                <updated>Tue, 6 Dec 2022 02:45:36 +0000</updated>
                            <resolved>Fri, 12 Feb 2021 17:20:31 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3614187" author="charlie.swanson" created="Fri, 12 Feb 2021 17:20:31 +0000"  >&lt;p&gt;After chatting with the QO team, we decided to close this as &quot;Won&apos;t Fix&quot;, because the associated BFs seem to have died off. We will re-open and reconsider should that situation change.&lt;/p&gt;</comment>
                            <comment id="2525759" author="charlie.swanson" created="Fri, 8 Nov 2019 19:08:09 +0000"  >&lt;p&gt;So - plot twist. The &apos;allowImplicitCollectionCreation: false&apos; flag we now set on $merge does not actually prevent the collection from being created. It just prevents the shard from doing it implicitly itself - it causes the config server to drive the collection create. This means that my workaround in these tests doesn&apos;t work. Fortunately, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=janna.golden&quot; class=&quot;user-hover&quot; rel=&quot;janna.golden&quot;&gt;janna.golden&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt; and I discussed and recognized that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44252&quot; title=&quot;Delete implicit collection creation loop through the config server in sharding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44252&quot;&gt;&lt;del&gt;SERVER-44252&lt;/del&gt;&lt;/a&gt; was planned to remove the flag for allowImplicitCollectionCreation. Instead of removing it, we plan to let that ticket proceed and take away any callers of allowImplicitCollectionCreation: false except for $merge. Once we do that, we can change what the flag means to better suit our purpose: under no circumstances is the collection to be created.&lt;/p&gt;

&lt;p&gt;So for now I&apos;m abandoning the code review I sent &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt; and I&apos;m going to mark this as &quot;depends on&quot; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44252&quot; title=&quot;Delete implicit collection creation loop through the config server in sharding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44252&quot;&gt;&lt;del&gt;SERVER-44252&lt;/del&gt;&lt;/a&gt;. This means that we won&apos;t be able to fix the BFs on the v4.2 branch, so I&apos;ll eventually mark them as trivial once we fix them on master.&lt;/p&gt;</comment>
                            <comment id="2512619" author="charlie.swanson" created="Thu, 31 Oct 2019 15:16:04 +0000"  >&lt;p&gt;Didn&apos;t get any real work done on this last week due to interviews.&lt;/p&gt;</comment>
                            <comment id="2467451" author="charlie.swanson" created="Fri, 4 Oct 2019 21:16:04 +0000"  >&lt;p&gt;I&apos;ve got a proposed fix for BF-14122, but next week I&apos;d like to look into how we can work around the other linked BFs.&#160;&lt;/p&gt;</comment>
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            <issuekey id="665876">SERVER-38852</issuekey>
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