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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-79885] Oplog fetching getMore should not set null lastKnownCommittedOpTime if it is not using exhaust cursors</title>
                <link>https://jira.mongodb.org/browse/SERVER-79885</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78813&quot; title=&quot;Commit point propagation fails indefinitely with exhaust cursors with null lastCommitted optime&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78813&quot;&gt;&lt;del&gt;SERVER-78813&lt;/del&gt;&lt;/a&gt; fixed a commit point propagation issue for exhaust oplog fetching cursors when the lastKnownCommittedOpTime is null (i.e. timestamp 0, 0). The way it works now after that fix is that the sync source would consider null  lastKnownCommittedOpTime as the smallest opTime and would always (when the sync source has a non-null lastCommitted) trigger empty batches to expedite commit point propagation.&lt;/p&gt;

&lt;p&gt;However, this is not desirable for non-exhaust cursors especially when the syncing node isn&apos;t able to advance its commit point after receiving oplog batches (e.g. during initial sync as we don&apos;t set lastCommitted until after initial sync finishes). So this means that the oplog getMore sent by the syncing node would &lt;em&gt;always&lt;/em&gt; have a null lastKnownCommittedOpTime, triggering empty batches unnecessarily every single time towards the end of initial sync (after the initial syncing node catches up).&lt;/p&gt;

&lt;p&gt;4.4+ by default should use exhaust cursors, so this by default isn&apos;t an issue. But exhaust cursor could be turned off manually via &lt;tt&gt;oplogFetcherUsesExhaust&lt;/tt&gt;. And then it would become an issue. Additionally, 4.4 in FCV 4.2 will also by default use non-exhaust cursors. So fixing this will help backporting &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78813&quot; title=&quot;Commit point propagation fails indefinitely with exhaust cursors with null lastCommitted optime&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78813&quot;&gt;&lt;del&gt;SERVER-78813&lt;/del&gt;&lt;/a&gt; to 4.4&lt;/p&gt;</description>
                <environment></environment>
        <key id="2413421">SERVER-79885</key>
            <summary>Oplog fetching getMore should not set null lastKnownCommittedOpTime if it is not using exhaust cursors</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="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Aug 2023 18:33:53 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:45 +0000</updated>
                            <resolved>Fri, 11 Aug 2023 14:02:54 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.1</fixVersion>
                    <fixVersion>6.0.10</fixVersion>
                    <fixVersion>5.0.21</fixVersion>
                    <fixVersion>4.4.25</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5651827" author="xgen-internal-githook" created="Tue, 22 Aug 2023 20:09:48 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79885&quot; title=&quot;Oplog fetching getMore should not set null lastKnownCommittedOpTime if it is not using exhaust cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79885&quot;&gt;&lt;del&gt;SERVER-79885&lt;/del&gt;&lt;/a&gt;: Oplog fetching getMore should only set null lastKnownCommittedOpTime for exhaust cursors&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eeac78cd8de74ca1cffb18eb4b798b8392df6192)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/425a0454d12f2664f9e31002bbe4a386a25345b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/425a0454d12f2664f9e31002bbe4a386a25345b5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5650038" author="xgen-internal-githook" created="Tue, 22 Aug 2023 13:28:15 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79885&quot; title=&quot;Oplog fetching getMore should not set null lastKnownCommittedOpTime if it is not using exhaust cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79885&quot;&gt;&lt;del&gt;SERVER-79885&lt;/del&gt;&lt;/a&gt;: Oplog fetching getMore should only set null lastKnownCommittedOpTime for exhaust cursors&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eeac78cd8de74ca1cffb18eb4b798b8392df6192)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d7ef660c7871cd3df8d77d3a55b09863ea3e6b22&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d7ef660c7871cd3df8d77d3a55b09863ea3e6b22&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5634128" author="xgen-internal-githook" created="Tue, 15 Aug 2023 01:32:18 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79885&quot; title=&quot;Oplog fetching getMore should not set null lastKnownCommittedOpTime if it is not using exhaust cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79885&quot;&gt;&lt;del&gt;SERVER-79885&lt;/del&gt;&lt;/a&gt;: Oplog fetching getMore should only set null lastKnownCommittedOpTime for exhaust cursors&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eeac78cd8de74ca1cffb18eb4b798b8392df6192)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c8326785cfdcd3497c1cf865e637a6b1cfc629e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c8326785cfdcd3497c1cf865e637a6b1cfc629e9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5633468" author="xgen-internal-githook" created="Mon, 14 Aug 2023 19:37:13 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79885&quot; title=&quot;Oplog fetching getMore should not set null lastKnownCommittedOpTime if it is not using exhaust cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79885&quot;&gt;&lt;del&gt;SERVER-79885&lt;/del&gt;&lt;/a&gt;: Oplog fetching getMore should only set null lastKnownCommittedOpTime for exhaust cursors&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eeac78cd8de74ca1cffb18eb4b798b8392df6192)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b7055580d9cc3d0870b8de4b3d1bcf553b44146&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b7055580d9cc3d0870b8de4b3d1bcf553b44146&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5627839" author="xgen-internal-githook" created="Fri, 11 Aug 2023 04:33:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79885&quot; title=&quot;Oplog fetching getMore should not set null lastKnownCommittedOpTime if it is not using exhaust cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79885&quot;&gt;&lt;del&gt;SERVER-79885&lt;/del&gt;&lt;/a&gt;: Oplog fetching getMore should only set null lastKnownCommittedOpTime for exhaust cursors&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eeac78cd8de74ca1cffb18eb4b798b8392df6192&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eeac78cd8de74ca1cffb18eb4b798b8392df6192&lt;/a&gt;&lt;/p&gt;</comment>
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