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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-44710] Add metrics.repl.network.getmores.numEmptyBatches</title>
                <link>https://jira.mongodb.org/browse/SERVER-44710</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;Add metrics.repl.network.getmores.numEmptyBatches&#160;on syncing nodes to report the number of empty batches to help diagnosing tailable awaitData logic.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1009373">SERVER-44710</key>
            <summary>Add metrics.repl.network.getmores.numEmptyBatches</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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>Mon, 18 Nov 2019 17:17:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:49 +0000</updated>
                            <resolved>Thu, 20 Feb 2020 16:47:35 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2886786" author="xgen-internal-githook" created="Thu, 20 Feb 2020 16:22:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;username&apos;: &apos;ldennis&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44710&quot; title=&quot;Add metrics.repl.network.getmores.numEmptyBatches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44710&quot;&gt;&lt;del&gt;SERVER-44710&lt;/del&gt;&lt;/a&gt;: Add metrics.repl.network.getmores.numEmptyBatches&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f26fc48b099deb568cac3c2702cbc636991ead92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f26fc48b099deb568cac3c2702cbc636991ead92&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1083216">SERVER-45469</issuekey>
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                            <customfieldvalue>numEmptyBatches is a new field under metrics.repl.network.getmores. This number reports the number of empty oplog batches a secondary node receives from its sync source. A secondary will get an empty oplog batch only when it is fully synced (i.e. the oplog getmore operation does not initial return data) and if:&lt;br/&gt;
1. The getmore operation also times out waiting for more data (oplog entries).&lt;br/&gt;
OR&lt;br/&gt;
2. The sync source&amp;#39;s majority commit point has advanced since the last batch sent to the secondary node.</customfieldvalue>

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