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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21182] Fix replica set monitor ownership</title>
                <link>https://jira.mongodb.org/browse/SERVER-21182</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, there is 1-1 relationship between RemoteCommandTargeter and ReplicaSetMonitor. Because of this, if the RSM becomes unusable due to none of the hosts being reachable, the targeter will forever be using an unusable RSM, which may happen if shards are inaccessible in the beginning.&lt;/p&gt;

&lt;p&gt;What saves us in this case is that we periodically (every 30 sec) reload the shard registry, done by the balancer loop, which will recreate the targeters and install new RSMs.&lt;/p&gt;

&lt;p&gt;We should make the RemoteCommandTargeter own the ReplicaSetMonitor and introduce a polling thread in the ShardRegistry so that we have finer control over its behaviour.&lt;/p&gt;</description>
                <environment></environment>
        <key id="235758">SERVER-21182</key>
            <summary>Fix replica set monitor ownership</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="ben.caimano@mongodb.com">Benjamin Caimano</assignee>
                                    <reporter username="crystal.horn@mongodb.com">Crystal Horn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Oct 2015 19:06:15 +0000</created>
                <updated>Mon, 12 Aug 2019 18:09:01 +0000</updated>
                            <resolved>Mon, 12 Aug 2019 18:09:01 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2367235" author="ben.caimano" created="Mon, 12 Aug 2019 18:09:01 +0000"  >&lt;p&gt;There is currently one RCM to many RCTs/DBClientRSes. That&apos;s no longer 1-1. The RSM no longer becomes permanently unusable if none of those hosts are unreachable. Wouldn&apos;t surprise me if it did do that at one point, but it hasn&apos;t been the case at least since 3.6. It also &lt;a href=&quot;https://github.com/mongodb/mongo/commit/2b88a598c226f2ee65a2d9975f0d019c283700ad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does expedited scanning&lt;/a&gt; since early 4.1. I&apos;d say we don&apos;t have to worry about this ticket any more.&lt;/p&gt;</comment>
                            <comment id="2344599" author="ben.caimano" created="Thu, 25 Jul 2019 20:46:14 +0000"  >&lt;p&gt;Stealing to service arch and investigating&lt;/p&gt;</comment>
                            <comment id="1083252" author="schwerin" created="Mon, 9 Nov 2015 15:25:44 +0000"  >&lt;p&gt;Kal, please put a more complete description on this and move to 3.1 Desired.&lt;/p&gt;</comment>
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