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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-77911] Shard merge importing collection without timestamp can trigger invariant failure in HistoricalCatalogIdTracker.</title>
                <link>https://jira.mongodb.org/browse/SERVER-77911</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Shard merge does non-timestamped catalog writes when importing collections (i,e, collections created during physical cloning phase). But, does timestamped catalog writes when dropping those collections. This mixed timestamp mode usage can trigger &lt;a href=&quot;https://github.com/10gen/mongo/blob/7f6eac6452a6e6e5739009117cd3b31417a95cac/src/mongo/db/catalog/historical_catalogid_tracker.cpp#L586&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant failure&lt;/a&gt; in HistoricalCatalogIdTracker which was introduced to support point-in-time catalog lookups&#160;PM-2218.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Noting the problematic sequence here.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Fixture starts migrationId1.&lt;/li&gt;
	&lt;li&gt;Recipient imports the donor collection&#160; say&#160;&lt;tt&gt;&amp;lt;tenanId1&amp;gt;_db.coll&lt;/tt&gt;&#160;untimestamped.&lt;br/&gt;
a)&#160;&lt;b&gt;&amp;lt;catalogRecordID&amp;lt;X&amp;gt;,&#160; boost::none TS&amp;gt; entry gets inserted into HistoricalCatalogIdTracker for this nss.&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;migrationid1 get committed.&lt;/li&gt;
	&lt;li&gt;Fixture drops the collection &amp;lt;tenanId1&amp;gt;_db.coll but it&#8217;s timestamped writes with dropTS as TS(100).&lt;br/&gt;
a)&#160;&lt;b&gt;&amp;lt;boost::none,&#160; TS(100)&amp;gt; entry gets inserted into HistoricalCatalogIdTracker for this nss.&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;Fixture starts another migrationId2.&lt;/li&gt;
	&lt;li&gt;Recipient imports the donor collection&#160; say&#160;&lt;tt&gt;&amp;lt;tenanId1&amp;gt;_db.coll&lt;/tt&gt;&#160;untimestamped.&lt;br/&gt;
a)&#160;&lt;b&gt;This will skip inserting entry into HistoricalCatalogIdTracker&lt;/b&gt;&#160;&lt;b&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/7f6eac6452a6e6e5739009117cd3b31417a95cac/src/mongo/db/catalog/historical_catalogid_tracker.cpp#L545-LL553&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;as HistoricalCatalogId list is non-empty for this nss.&lt;/a&gt;&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;When the oldest ts&#160; is no longer &amp;lt; TS(100), TimestampMonitor deletes the expired 2-a) and 4-a) entries from HistoricalCatalogIdTracker.&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;migrationid2 get committed.&lt;/li&gt;
	&lt;li&gt;Fixture drops the collection &amp;lt;tenanId1&amp;gt;_db.coll but it&#8217;s timestamped writes.&lt;br/&gt;
a)&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/7f6eac6452a6e6e5739009117cd3b31417a95cac/src/mongo/db/catalog/historical_catalogid_tracker.cpp#L586&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This throws the invariant failure&lt;/a&gt;&#160;because&#160;&lt;b&gt;HistoricalCatalogId list is empty for this nss.&lt;/b&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2362506">SERVER-77911</key>
            <summary>Shard merge importing collection without timestamp can trigger invariant failure in HistoricalCatalogIdTracker.</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="suganthi.mani@mongodb.com">Suganthi Mani</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Jun 2023 14:25:35 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:20 +0000</updated>
                            <resolved>Mon, 14 Aug 2023 18:52:48 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5633210" author="xgen-internal-githook" created="Mon, 14 Aug 2023 18:51:11 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Suganthi Mani&apos;, &apos;email&apos;: &apos;suganthi.mani@mongodb.com&apos;, &apos;username&apos;: &apos;smani87&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77911&quot; title=&quot;Shard merge importing collection without timestamp can trigger invariant failure in HistoricalCatalogIdTracker.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77911&quot;&gt;&lt;del&gt;SERVER-77911&lt;/del&gt;&lt;/a&gt; HistoricalCatalogIdTracker handles mixed mode catalog writes for shard merge.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b3653dc5d0bc4940971bc13591341341e0b4d4fc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b3653dc5d0bc4940971bc13591341341e0b4d4fc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5633019" author="suganthi.mani" created="Mon, 14 Aug 2023 17:50:58 +0000"  >&lt;p&gt;Just for the ticket watchers, filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79982&quot; title=&quot;Batched catalog writers can run concurrently with  HistoricalCatalogIdTracker::cleanup() and lead to incorrect PIT find results.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79982&quot;&gt;&lt;del&gt;SERVER-79982&lt;/del&gt;&lt;/a&gt; for the data inconsistency bug.&lt;/p&gt;</comment>
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