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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16952] Optimize oplog reader batching</title>
                <link>https://jira.mongodb.org/browse/SERVER-16952</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It is likely that batches are smaller since the primary can write with higher concurrency and lower latency causing replicating member to return smaller batches of documents during replication.&lt;/p&gt;

&lt;p&gt;If this is true this will lead to lower latency in replication &quot;eventual consistency&quot; but increased network traffic and larger load, both in cpu and contention, on both members.&lt;/p&gt;

&lt;p&gt;There are other reasons that the batches may be smaller including:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Change in lock acquisition (fairness)&lt;/li&gt;
	&lt;li&gt;Yielding and interleave behavior&lt;/li&gt;
	&lt;li&gt;Replication changes during re-write&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In order to better analyze this behavior we should be able to look at the replication network metrics (metrics.repl.network.getmores/ops) which record the reader side of replication.&lt;/p&gt;</description>
                <environment></environment>
        <key id="179705">SERVER-16952</key>
            <summary>Optimize oplog reader batching</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="9">Done</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Jan 2015 18:48:27 +0000</created>
                <updated>Tue, 6 Dec 2022 04:56:47 +0000</updated>
                            <resolved>Thu, 9 Mar 2017 20:40:03 +0000</resolved>
                                                                    <component>Replication</component>
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