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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-58636] Initial syncing node can miss final oplog entry when calculating stopTimestamp against a secondary sync source</title>
                <link>https://jira.mongodb.org/browse/SERVER-58636</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;(10/4/21 discoverability update: We figured out this happens due to the relevant secondary read getting a readSource of lastApplied (per most other use cases). Making that an untimestamped read solves the problem.)&lt;/p&gt;

&lt;p&gt;The calls to &lt;tt&gt;applyCommand_inlock&lt;/tt&gt; and &lt;tt&gt;scheduleOplogWrites&lt;/tt&gt; in secondary application are not atomic. So it&apos;s possible that when an initial syncing node chooses a secondary as a sync source, it sees that a command like &lt;tt&gt;drop&lt;/tt&gt; has been applied, but misses the oplog entry when calculating the &lt;tt&gt;stopTimestamp&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;The following can happen:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Initial syncing node sees the &lt;tt&gt;drop&lt;/tt&gt; on collection &lt;tt&gt;foo&lt;/tt&gt;&#160;has been applied on a secondary sync source (but no oplog write yet). The collectionCloner will stop with &lt;tt&gt;NamespaceNotFound&lt;/tt&gt; error, expecting us to apply the drop during the initial sync oplog application phase.&lt;/li&gt;
	&lt;li&gt;Initial syncing node fetches the lastApplied of the sync source, setting the stopTimestamp to T.&lt;/li&gt;
	&lt;li&gt;The sync source writes the oplog for the &lt;tt&gt;drop&lt;/tt&gt; from (1) at timestamp T + 1.&lt;/li&gt;
	&lt;li&gt;The initial syncing node reaches stopTimestamp T, transitions to secondary, and applies the &lt;tt&gt;drop&lt;/tt&gt;, and crashes because the collection does not exist.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="1822746">SERVER-58636</key>
            <summary>Initial syncing node can miss final oplog entry when calculating stopTimestamp against a secondary sync source</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="vesselina.ratcheva@mongodb.com">Vesselina Ratcheva</assignee>
                                    <reporter username="jason.chan@mongodb.com">Jason Chan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Jul 2021 19:43:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:44 +0000</updated>
                            <resolved>Tue, 5 Oct 2021 01:41:51 +0000</resolved>
                                    <version>4.4.7</version>
                    <version>5.0.0-rc8</version>
                                    <fixVersion>4.4.11</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                    <fixVersion>5.0.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4201456" author="xgen-internal-githook" created="Fri, 19 Nov 2021 18:47:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58636&quot; title=&quot;Initial syncing node can miss final oplog entry when calculating stopTimestamp against a secondary sync source&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58636&quot;&gt;&lt;del&gt;SERVER-58636&lt;/del&gt;&lt;/a&gt; Allow initial syncing nodes to see entries from uncommitted batches on secondaries&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4a230c070cb187604d07d04598a912b4feca937d)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/755aaba320ca2a2a163f198ee7d249e95fdd77e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/755aaba320ca2a2a163f198ee7d249e95fdd77e7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4196582" author="xgen-internal-githook" created="Wed, 17 Nov 2021 23:51:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58636&quot; title=&quot;Initial syncing node can miss final oplog entry when calculating stopTimestamp against a secondary sync source&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58636&quot;&gt;&lt;del&gt;SERVER-58636&lt;/del&gt;&lt;/a&gt; Allow initial syncing nodes to see entries from uncommitted batches on secondaries&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4a230c070cb187604d07d04598a912b4feca937d)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2c046c14b8042d025b44142b6d32138a11aaf223&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2c046c14b8042d025b44142b6d32138a11aaf223&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4107675" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:33:03 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4101202" author="xgen-internal-githook" created="Mon, 4 Oct 2021 23:57:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vesselina Ratcheva&apos;, &apos;email&apos;: &apos;vesselina.ratcheva@10gen.com&apos;, &apos;username&apos;: &apos;vessy-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58636&quot; title=&quot;Initial syncing node can miss final oplog entry when calculating stopTimestamp against a secondary sync source&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58636&quot;&gt;&lt;del&gt;SERVER-58636&lt;/del&gt;&lt;/a&gt; Allow initial syncing nodes to see entries from uncommitted batches on secondaries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a230c070cb187604d07d04598a912b4feca937d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a230c070cb187604d07d04598a912b4feca937d&lt;/a&gt;&lt;/p&gt;</comment>
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