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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-19816] Oplog replication throughput is bounded by network latency</title>
                <link>https://jira.mongodb.org/browse/SERVER-19816</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Assuming a constant stream of operations totalling 50MB/s data (eg. insertions) to a replica-set, any Secondary that has more than ~40ms network latency (~80ms ping) to its next nearest member will be unable to keep up regardless of the network bandwidth between them.&lt;/p&gt;

&lt;p&gt;If the ping time between any two members of a replica set is known, the upper limit for replication throughput in MB/s between those two members can be calculated with the following equation:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;4 * 1000 / ping_time_in_ms&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;The limit arises because the tailable cursor retrieves at max 4MB per roundtrip but the request/reply is serial. Thus, the longer a roundtrip (ping) takes, the lower the throughput.&lt;/p&gt;</description>
                <environment></environment>
        <key id="224583">SERVER-19816</key>
            <summary>Oplog replication throughput is bounded by network latency</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="9">Done</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="andrew.ryder@mongodb.com">Andrew Ryder</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Aug 2015 04:44:12 +0000</created>
                <updated>Tue, 6 Dec 2022 04:46:51 +0000</updated>
                            <resolved>Fri, 3 Jan 2020 23:38:00 +0000</resolved>
                                    <version>2.6.11</version>
                    <version>3.0.5</version>
                                                    <component>Replication</component>
                                        <votes>3</votes>
                                    <watches>24</watches>
                                                                                                                <comments>
                            <comment id="2703531" author="judah.schvimer" created="Fri, 3 Jan 2020 23:37:36 +0000"  >&lt;p&gt;This is being fixed by (PM-1232) Use Exhaust Cursors for Oplog Fetching.&lt;/p&gt;</comment>
                            <comment id="1119812" author="milkie" created="Mon, 21 Dec 2015 20:14:14 +0000"  >&lt;p&gt;We&apos;re planning on raising the limit to 16MB soon, which will greatly improve things &amp;#8211; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21797&quot; title=&quot;Simplify find batching logic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21797&quot;&gt;&lt;del&gt;SERVER-21797&lt;/del&gt;&lt;/a&gt;.  Raising the limit higher than that, or a rearchitecting of the current data fetching design, is a larger undertaking.&lt;/p&gt;</comment>
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