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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-54653] Make ContinuousTenantMigration hook garbage collect each migration before starting the next one</title>
                <link>https://jira.mongodb.org/browse/SERVER-54653</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53582&quot; title=&quot;Create and remove TenantMigrationAccessBlocker on recipient &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53582&quot;&gt;&lt;del&gt;SERVER-53582&lt;/del&gt;&lt;/a&gt;, the&#160;ContinuousTenantMigration hook is expected to no longer work since it cannot start migration rs1 -&amp;gt; rs2 without garbage collecting migration rs0 -&amp;gt; rs1. The reason is that the donor MTAB and recipient MTAB are both stored in the MTABRegistry so it will get&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/af1943cd76a4637a73f10674606d23b4c71b29b5/src/mongo/db/repl/tenant_migration_access_blocker_registry.cpp#L47-L50&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ConflictingOperationInProgress error&lt;/a&gt;&#160;when it tries to start migration rs1 -&amp;gt; rs2.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;br/&gt;
 It is an overkill to support starting an outgoing migration before garbage collecting last incoming migration for a tenant just to make the hook work since:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Cloud will never run migrations for a tenant so close to each other and without garbage collecting the previous one (although there is nothing illegal with what the hook does).&lt;/li&gt;
	&lt;li&gt;Given 1, it should be useful to throw an error when we detect that Cloud is trying to start a migration for a tenant without garbage collecting the previous one.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;So the hook should just garbage collect&#160;each migration before starting the next one.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1628658">SERVER-54653</key>
            <summary>Make ContinuousTenantMigration hook garbage collect each migration before starting the next one</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Feb 2021 17:53:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:17 +0000</updated>
                            <resolved>Fri, 19 Feb 2021 23:59:44 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3626252" author="xgen-internal-githook" created="Fri, 19 Feb 2021 23:34:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54653&quot; title=&quot;Make ContinuousTenantMigration hook garbage collect each migration before starting the next one&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54653&quot;&gt;&lt;del&gt;SERVER-54653&lt;/del&gt;&lt;/a&gt; Make ContinuousTenantMigration hook garbage collect each migration before starting the next one&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a2ad8a9496400df2b01d9901f4cc3008fbcf20a6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a2ad8a9496400df2b01d9901f4cc3008fbcf20a6&lt;/a&gt;&lt;/p&gt;</comment>
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