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            <title>[SERVER-26980] Allow maxStalenessSeconds values as small as 40</title>
                <link>https://jira.mongodb.org/browse/SERVER-26980</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongos 3.4 adheres to the original Max Staleness Spec, which said that maxStalenessSeconds must be at least twice heartbeatFrequencyMS. mongos&apos;s replica set monitoring period is 30 seconds (right?) that means its smallest maxStalenessSeconds is 60.&lt;/p&gt;

&lt;p&gt;Update for a recent change to the Max Staleness Spec: maxStalenessSeconds must be at least heartbeatFrequencyMS + idleWritePeriodMillis, which are 30 and 10 seconds. Therefore the smallest maxStalenessSeconds is 40.&lt;/p&gt;</description>
                <environment></environment>
        <key id="330978">SERVER-26980</key>
            <summary>Allow maxStalenessSeconds values as small as 40</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-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Nov 2016 15:15:39 +0000</created>
                <updated>Tue, 6 Dec 2022 04:12:05 +0000</updated>
                            <resolved>Thu, 29 Dec 2016 16:45:16 +0000</resolved>
                                    <version>3.4.0-rc3</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1466527" author="schwerin" created="Thu, 29 Dec 2016 16:45:16 +0000"  >&lt;p&gt;The spec changed since this ticket was filed, and the minimum supported value is 90 seconds.&lt;/p&gt;</comment>
                            <comment id="1431228" author="jesse" created="Thu, 10 Nov 2016 17:05:35 +0000"  >&lt;p&gt;A &lt;b&gt;driver&lt;/b&gt; can do 10.5 if you turn down heartbeatFrequencyMS to 500ms, because maxStalenessSeconds must be at least heartbeatFrequencyMS + idleWritePeriodMillis (10 seconds).&lt;/p&gt;

&lt;p&gt;A &lt;b&gt;mongos&lt;/b&gt; can do 40, since its heartbeat is 30 seconds, not configurable, and maxStalenessSeconds must be at least heartbeatFrequencyMS + idleWritePeriodMillis (10 seconds).&lt;/p&gt;</comment>
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