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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-9021] Make sure that at most one thread at a time in mongos is making calls to the shard replSets to update the health of the nodes</title>
                <link>https://jira.mongodb.org/browse/SERVER-9021</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, multiple threads trying to perform operations on a replica set can both trigger _check to be called, which sends isMaster and replSetGetStatus calls to the replica set to update which nodes are currently healthy.  This can cause many more commands to be sent to the replSet members than is necessary as those multiple threads are performing redundant work.  We should make sure that at any one time there is only one thread actively updating mongos&apos; knowledge of the health of a replica set.&lt;/p&gt;

&lt;p&gt;One way to accomplish this would be to make one system thread responsible for all the monitoring of the health of the set, as described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5392&quot; title=&quot;Consider allowing only one thread to be responsible in modifying _nodes in ReplicaSetMonitor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5392&quot;&gt;&lt;del&gt;SERVER-5392&lt;/del&gt;&lt;/a&gt;, though other approaches may be possible.&lt;/p&gt;</description>
                <environment></environment>
        <key id="68982">SERVER-9021</key>
            <summary>Make sure that at most one thread at a time in mongos is making calls to the shard replSets to update the health of the nodes</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="3">Duplicate</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>revisit</label>
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                <created>Tue, 19 Mar 2013 16:00:49 +0000</created>
                <updated>Mon, 28 Sep 2015 21:11:25 +0000</updated>
                            <resolved>Mon, 28 Sep 2015 21:11:25 +0000</resolved>
                                                                    <component>Internal Code</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="511646" author="greg_10gen" created="Fri, 7 Mar 2014 17:48:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=redbeard0531&quot; class=&quot;user-hover&quot; rel=&quot;redbeard0531&quot;&gt;redbeard0531&lt;/a&gt; - is this fixed by your changes to ReplicaSetMonitor?&lt;/p&gt;</comment>
                            <comment id="293067" author="spencer" created="Tue, 19 Mar 2013 16:05:53 +0000"  >&lt;p&gt;It may be possible to make keep the existing threading model and make each thread ensure that there are no checks currently in progress before starting a new check, but I&apos;m not sure what exactly would be required to make that work or how difficult it would be.&lt;/p&gt;</comment>
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