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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-81229] Move primary may not cleanup cloned collections on failure</title>
                <link>https://jira.mongodb.org/browse/SERVER-81229</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;TL;DR,&lt;/b&gt; in the event of a step-down of the primary node of the donor shard while the cloning phase of a &lt;tt&gt;movePrimary&lt;/tt&gt; operation is in progress, the cloning procedure on recipient side is not aborted. This causes the presence of orphaned collections on the recipient and &lt;a href=&quot;https://github.com/10gen/mongo/blob/af286c2a649d3e1ec917148eb19c1c241203fa8f/src/mongo/db/s/move_primary_coordinator.cpp#L342&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the consequent failure&lt;/a&gt; of any attempt to repeat the &lt;tt&gt;movePrimary&lt;/tt&gt; operation (&lt;tt&gt;NamespaceExists&lt;/tt&gt;&#160;error).&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Technicaldetails&quot;&gt;&lt;/a&gt;Technical details&lt;/h3&gt;

&lt;p&gt;During the cloning phase of the &lt;tt&gt;movePrimary&lt;/tt&gt; operation, the DDL coordinator calls the &lt;tt&gt;_shardsvrCloneCatalogData&lt;/tt&gt; command of the recipient, which creates and fetches all unsharded collections from the donor to the recipient. In the event of a failure (step-down) during this phase, the coordinator &lt;a href=&quot;https://github.com/10gen/mongo/blob/af286c2a649d3e1ec917148eb19c1c241203fa8f/src/mongo/db/s/move_primary_coordinator.cpp#L374&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;drops the data possibly cloned on the recipient&lt;/a&gt; and aborts the &lt;tt&gt;movePrimary&lt;/tt&gt; operation.&lt;/p&gt;

&lt;p&gt;The bug is that the coordinator doesn&apos;t abort the data cloning procedure possibly running on the recipient. The clean up of data, possibly already cloned on the recipient, doesn&apos;t resolve the problem since the cloning procedure could be running in background.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Userimpacts&quot;&gt;&lt;/a&gt;User impacts&lt;/h3&gt;

&lt;p&gt;The recipient shard could own orphaned collections which cause any attempt to repeat the &lt;tt&gt;movePrimary&lt;/tt&gt; operation to fail. There is no evident business impact (data remain consistent) but a manual intervention on the recipient is required to drop these orphaned collections and then to allow a new &lt;tt&gt;movePrimary&lt;/tt&gt; attempt to work.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Potentialsolution&quot;&gt;&lt;/a&gt;Potential solution&lt;/h3&gt;

&lt;p&gt;The cloning phase of a &lt;tt&gt;movePrimary&lt;/tt&gt; is heavily expensive in terms of execution times (in production it could take hours), so the cloning operation on the recipient side must not be joined but aborted. An idea is to tag the&#160; &lt;tt&gt;_shardsvrCloneCatalogData&lt;/tt&gt; operation and to kill it (using the tag) when the &lt;tt&gt;movePrimary&lt;/tt&gt; operation is recovered by the coordinator (&lt;a href=&quot;https://github.com/10gen/mongo/blob/af286c2a649d3e1ec917148eb19c1c241203fa8f/src/mongo/db/s/move_primary_coordinator.cpp#L374&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;before to clean any cloned data&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2446627">SERVER-81229</key>
            <summary>Move primary may not cleanup cloned collections on failure</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="13201">Fixed</resolution>
                                        <assignee username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Wed, 20 Sep 2023 06:53:56 +0000</created>
                <updated>Fri, 24 Nov 2023 19:45:50 +0000</updated>
                            <resolved>Wed, 22 Nov 2023 09:06:37 +0000</resolved>
                                    <version>7.0.1</version>
                    <version>7.1.0-rc3</version>
                    <version>7.2.0-rc1</version>
                                    <fixVersion>7.3.0-rc0</fixVersion>
                    <fixVersion>7.2.0-rc2</fixVersion>
                    <fixVersion>7.0.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5903323" author="xgen-internal-githook" created="Fri, 24 Nov 2023 19:38:07 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81229&quot; title=&quot;Move primary may not cleanup cloned collections on failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81229&quot;&gt;&lt;del&gt;SERVER-81229&lt;/del&gt;&lt;/a&gt; Add replay protection to clone command of move primary&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 87497867081849cd2bd727d70635484f205ddfcd)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8bd433723b427e4defc5ccab46416a57fc3bfb07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8bd433723b427e4defc5ccab46416a57fc3bfb07&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5902832" author="xgen-internal-githook" created="Fri, 24 Nov 2023 12:56:21 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81229&quot; title=&quot;Move primary may not cleanup cloned collections on failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81229&quot;&gt;&lt;del&gt;SERVER-81229&lt;/del&gt;&lt;/a&gt; Add replay protection to clone command of move primary&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 87497867081849cd2bd727d70635484f205ddfcd)&lt;br/&gt;
Branch: v7.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/de3690dbb445e500d18bb48273bc1cb420c8e25f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/de3690dbb445e500d18bb48273bc1cb420c8e25f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5896748" author="xgen-internal-githook" created="Tue, 21 Nov 2023 20:38:42 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81229&quot; title=&quot;Move primary may not cleanup cloned collections on failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81229&quot;&gt;&lt;del&gt;SERVER-81229&lt;/del&gt;&lt;/a&gt; Add replay protection to clone command of move primary&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/87497867081849cd2bd727d70635484f205ddfcd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/87497867081849cd2bd727d70635484f205ddfcd&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2499427">SERVER-83230</issuekey>
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