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            <title>[SERVER-26569] Change frequency of periodic replicated writes while idle from 10 sec to 500ms</title>
                <link>https://jira.mongodb.org/browse/SERVER-26569</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a replica set is idle for several seconds or longer, clients&apos; staleness estimate of secondaries can be very inaccurate. Clients must make an honest staleness estimate to enforce the maxStalenessMS read preference.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=achille.brighton&quot; class=&quot;user-hover&quot; rel=&quot;achille.brighton&quot;&gt;achille.brighton&lt;/a&gt;&apos;s analysis shows the current idle write frequency of 10 seconds (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23892&quot; title=&quot;Do periodic replicated writes every 10 seconds while idle (for maxStalenessMS)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23892&quot;&gt;&lt;del&gt;SERVER-23892&lt;/del&gt;&lt;/a&gt;) allows inaccuracies large enough that a client can think a secondary is too stale to read from, even though the secondary is fresh enough. To ensure we always read from a fresh-enough secondary in an idle replica set, the idle write period should equal the client&apos;s minHeartbeatFrequencyMS, defined in the Server Discovery and Monitoring Spec as 500ms.&lt;/p&gt;</description>
                <environment></environment>
        <key id="322714">SERVER-26569</key>
            <summary>Change frequency of periodic replicated writes while idle from 10 sec to 500ms</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Oct 2016 13:24:37 +0000</created>
                <updated>Tue, 6 Dec 2022 04:14:32 +0000</updated>
                            <resolved>Sat, 29 Oct 2016 14:37:29 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1421290" author="jesse" created="Sat, 29 Oct 2016 14:37:29 +0000"  >&lt;p&gt;We&apos;ve resolved instead to require &lt;tt&gt;maxStaleness &amp;gt;= heartbeat + idleWriteFrequency&lt;/tt&gt;, which is large enough that clients won&apos;t accidentally exclude secondaries in an idle replica set.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/specifications/commit/70b554d2e88ee6a76d9595f8174af06d3406dfbf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/commit/70b554d2e88ee6a76d9595f8174af06d3406dfbf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1405912" author="schwerin" created="Tue, 11 Oct 2016 23:12:35 +0000"  >&lt;p&gt;This proposal has the negative effect of more quickly filling the oplog of idle clusters up with &quot;noop&quot; entries, which force out entries containing actual data that a stale node could use to catch up. I believe it would be wiser to raise the minimum &quot;maxStaleMs&quot; value to accommodate the accuracy available with 10s write frequency.&lt;/p&gt;</comment>
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