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    <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-67240] TTL monitor races with shard merge importing donor collection step, leading to recipient TTL monitor stopped monitoring imported donor collection with ttl index. </title>
                <link>https://jira.mongodb.org/browse/SERVER-67240</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Below is the racy scenario:&lt;/p&gt;

&lt;p&gt;1) &lt;b&gt;Importer thread&lt;/b&gt;: Shard merge imports a donor collection, say &apos;tenant.foo&apos;, with TTL index. Then, it calls &lt;tt&gt;ownedCollection-&amp;gt;init(opCtx);&lt;/tt&gt; which initializes the in-memory data structure that holds the  collection info (including the indexes info).&lt;a href=&quot;https://github.com/10gen/mongo/blob/102ac09a3066fac98577d6e2616298e78f78a12e/src/mongo/db/repl/tenant_migration_shard_merge_util.cpp#L213&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;init()&lt;/a&gt; method would in-turn make the *&apos;tenant.foo&apos; donor collection to get registered with TTL monitor *using the donor collection uuid.&lt;/p&gt;

&lt;p&gt;2) &lt;b&gt;TTL monitor&lt;/b&gt;: Wakes from sleep, do another TTL pass and now notices &apos;tenant.foo&apos; donor collection to be monitor. So, now it would query the in-memory collection catalog registry using the donor collection uuid to access the in-memory collection info data structure and couldn&apos;t find the entry. So, it thinks the collection is dropped and &lt;a href=&quot;https://github.com/10gen/mongo/blob/102ac09a3066fac98577d6e2616298e78f78a12e/src/mongo/db/ttl.cpp#L364&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;deregisters&lt;/a&gt; &apos;tenant.foo&apos; donor collection&apos; from TTL monitor.&lt;/p&gt;

&lt;p&gt;3)  &lt;b&gt;Importer thread&lt;/b&gt;: Now, &lt;a href=&quot;https://github.com/10gen/mongo/blob/102ac09a3066fac98577d6e2616298e78f78a12e/src/mongo/db/repl/tenant_migration_shard_merge_util.cpp#L220&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; step in import donor collection would make the collection to get registered with &lt;a href=&quot;https://github.com/10gen/mongo/blob/102ac09a3066fac98577d6e2616298e78f78a12e/src/mongo/db/catalog/collection_catalog.cpp#L1157&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;in-memory collection catalog registry&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2067597">SERVER-67240</key>
            <summary>TTL monitor races with shard merge importing donor collection step, leading to recipient TTL monitor stopped monitoring imported donor collection with ttl index. </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="christopher.caplinger@mongodb.com">Christopher Caplinger</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Jun 2022 19:44:26 +0000</created>
                <updated>Sun, 29 Oct 2023 21:36:53 +0000</updated>
                            <resolved>Fri, 21 Oct 2022 16:07:15 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4918879" author="xgen-internal-githook" created="Fri, 21 Oct 2022 15:54:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Christopher Caplinger&apos;, &apos;email&apos;: &apos;christopher.caplinger@mongodb.com&apos;, &apos;username&apos;: &apos;UnicodeSnowman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67240&quot; title=&quot;TTL monitor races with shard merge importing donor collection step, leading to recipient TTL monitor stopped monitoring imported donor collection with ttl index. &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67240&quot;&gt;&lt;del&gt;SERVER-67240&lt;/del&gt;&lt;/a&gt;: Fix TTL Monitor Race with Shard Merge&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9570d902706a9a1c456e1a6d78b555a92fbd23dc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9570d902706a9a1c456e1a6d78b555a92fbd23dc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4897513" author="henrik.edin" created="Wed, 12 Oct 2022 12:20:44 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=suganthi.mani%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;suganthi.mani@mongodb.com&quot;&gt;suganthi.mani@mongodb.com&lt;/a&gt;. I believe the fix is to register the index with the TTL monitor in a commit handler at which the Collection is fully committed into the CollectionCatalog.&#160;&lt;/p&gt;</comment>
                            <comment id="4895773" author="suganthi.mani" created="Tue, 11 Oct 2022 19:54:50 +0000"  >&lt;p&gt;Just noting down, this is a problem even for &lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/master/src/live_import/import_collection.cpp#L292-L306&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;live import&lt;/a&gt; (Shard merge is a copied code from live import).  So CC&apos;ing execution team leads for more visibility &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams@mongodb.com&quot;&gt;louis.williams@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henrik.edin%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;henrik.edin@mongodb.com&quot;&gt;henrik.edin@mongodb.com&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Actually, the live import copied the primary &lt;a href=&quot;https://github.com/10gen/mongo/blob/f87af6f88a5b2493241a9e96ae6057ad8f828adc/src/mongo/db/catalog/database_impl.cpp#L879-L882&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;createCollection cmd code logic&lt;/a&gt; and it&apos;s not a problem over there because when the collection is created initially, there won&apos;t be any active index entries in on-disk mdbCatalog collection whereas Shard merge and live import can have it as they use file copy based cloning.&lt;/p&gt;</comment>
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