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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-26759] stopMonitoringGuard in ShardingCatalogManagerImpl::addShard can remove an existing shard&apos;s ReplicaSetMonitor </title>
                <link>https://jira.mongodb.org/browse/SERVER-26759</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The stopMonitoringGuard&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc1/src/mongo/s/catalog/sharding_catalog_manager_impl.cpp#L742-L750&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.4.0-rc1/src/mongo/s/catalog/sharding_catalog_manager_impl.cpp#L742-L750&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;is meant to remove the ReplicaSetMonitor for a new shard if the addShard() fails for any reason.&lt;/p&gt;

&lt;p&gt;However, if the shard attempting to be added has the same setName as an existing shard&apos;s setName, the stopMonitoringGuard will use the existing shard&apos;s ReplicaSetMonitor and, on error, will remove that existing shard&apos;s ReplicaSetMonitor.&lt;/p&gt;

&lt;p&gt;Potential fixes:&lt;/p&gt;

&lt;p&gt;1) Check if a  ReplicaSetMonitor for the new shard&apos;s setName exists, and fail immediately if so.&lt;br/&gt;
2) Make the stopMonitoringGuard only remove the ReplicaSetMonitor on failure if it actually created it (this seems less preferable - why would we ever want to use an existing ReplicaSetMonitor during addShard?).&lt;/p&gt;</description>
                <environment></environment>
        <key id="326642">SERVER-26759</key>
            <summary>stopMonitoringGuard in ShardingCatalogManagerImpl::addShard can remove an existing shard&apos;s ReplicaSetMonitor </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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Oct 2016 14:45:03 +0000</created>
                <updated>Mon, 14 Nov 2016 21:36:40 +0000</updated>
                            <resolved>Mon, 14 Nov 2016 21:36:26 +0000</resolved>
                                    <version>3.4.0-rc1</version>
                                    <fixVersion>3.4.0-rc4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1433786" author="esha.maharishi@10gen.com" created="Mon, 14 Nov 2016 21:36:26 +0000"  >&lt;p&gt;Fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26761&quot; title=&quot;old ReplicaSetMonitor can be used on config when adding new shard with same setName as recently removed shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26761&quot;&gt;&lt;del&gt;SERVER-26761&lt;/del&gt;&lt;/a&gt;, since an existing ReplicaSetMonitor can no longer be used during addShard.&lt;/p&gt;</comment>
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