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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-35366] Oplog applier batch size should never be less than 16MB</title>
                <link>https://jira.mongodb.org/browse/SERVER-35366</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Here is where we calculate the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2c6bf9ead4270ffce87eda37b032848e89f86bc7/src/mongo/db/repl/oplog_applier.cpp#L101-L107&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;batch size&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="553273">SERVER-35366</key>
            <summary>Oplog applier batch size should never be less than 16MB</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Jun 2018 21:03:17 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:09 +0000</updated>
                            <resolved>Tue, 5 Jun 2018 22:13:10 +0000</resolved>
                                                    <fixVersion>4.0.0</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1911356" author="xgen-internal-githook" created="Tue, 5 Jun 2018 16:56:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;judahschvimer&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;email&apos;: &apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35366&quot; title=&quot;Oplog applier batch size should never be less than 16MB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35366&quot;&gt;&lt;del&gt;SERVER-35366&lt;/del&gt;&lt;/a&gt; OplogApplier only returns empty batch when buffer is empty&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9d000b9eced82065afaa4a64c227930da0d70206)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7d279ea159a8f781123f5a60012d4209cc97e41e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7d279ea159a8f781123f5a60012d4209cc97e41e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1911344" author="xgen-internal-githook" created="Tue, 5 Jun 2018 16:52:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;judahschvimer&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;email&apos;: &apos;judah@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35366&quot; title=&quot;Oplog applier batch size should never be less than 16MB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35366&quot;&gt;&lt;del&gt;SERVER-35366&lt;/del&gt;&lt;/a&gt; OplogApplier only returns empty batch when buffer is empty&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9d000b9eced82065afaa4a64c227930da0d70206&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9d000b9eced82065afaa4a64c227930da0d70206&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1908797" author="spencer" created="Fri, 1 Jun 2018 21:17:00 +0000"  >&lt;p&gt;Another approach would be to keep the batch size limit calculation the same, but ensure that every batch always has at least 1 op.  I don&apos;t think we care very much about the use case of nodes with oplogs smaller than 160MB, however, so the simpler fix of just making sure the batch size limit is always at least 16MB seems like a fine approach.&lt;/p&gt;</comment>
                            <comment id="1908787" author="judah.schvimer" created="Fri, 1 Jun 2018 21:10:04 +0000"  >&lt;p&gt;The batch size is checked in the oplog applier &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9bdb3df40dbdc5bfa49271d0da69bdea0b000d90/src/mongo/db/repl/oplog_applier.cpp#L174-L176&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. It&apos;s not set on the cursor.&lt;/p&gt;</comment>
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