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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-26761] old ReplicaSetMonitor can be used on config when adding new shard with same setName as recently removed shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-26761</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ReplicaSetMonitor is only synchronously (i.e., at the end of removeShard()) removed from the ReplicaSetMonitorManager on the mongos &lt;b&gt;doing&lt;/b&gt; the removeShard().&lt;/p&gt;

&lt;p&gt;All other processes remove the ReplicaSetMonitor the next time they do a ShardRegistry::reload() (which in the worst case happens every 30 seconds) and notice the shard no longer exists in config.shards.&lt;/p&gt;

&lt;p&gt;If, after the removeShard(), a new shard is added with the same replica set name and the config server has not done a ShardRegistry::reload() yet, it will use the old shard&apos;s ReplicaSetMonitor to target the new shard (including for the addShard checks).&lt;/p&gt;

&lt;p&gt;This is because ReplicaSetMonitorManager::getOrCreateMonitor() indexes ReplicaSetMonitor instances by setName instead of some unique id:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc1/src/mongo/client/replica_set_monitor_manager.cpp#L95-L99&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/client/replica_set_monitor_manager.cpp#L95-L99&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;1) If the old shard is still up, the addShard() will (incorrectly) fail with error:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;in seed list mySet/hostname:15516, host hostname:15516 does not belong to replica set mySet; found { hosts: [ \&quot;hostname:15515\&quot; ], setName: \&quot;mySet\&quot;, setVersion: 1, ismaster: true, secondary: false, primary: \&quot;hostname:15515\&quot;,  ...&quot;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;2) If the old shard was shut down, by a lucky additional pair of bugs (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26759&quot; title=&quot;stopMonitoringGuard in ShardingCatalogManagerImpl::addShard can remove an existing shard&amp;#39;s ReplicaSetMonitor &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26759&quot;&gt;&lt;del&gt;SERVER-26759&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26760&quot; title=&quot;ShardingCatalogManagerImpl::addShard() transparently passes retryable errors upstream&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26760&quot;&gt;&lt;del&gt;SERVER-26760&lt;/del&gt;&lt;/a&gt;), the old ReplicaSetMonitor will be removed after the first HostUnreachable response for the old shard, a new ReplicaSetMonitor will be created on the retry, and the addShard will (correctly) succeed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="326650">SERVER-26761</key>
            <summary>old ReplicaSetMonitor can be used on config when adding new shard with same setName as recently removed shard</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 14:48:49 +0000</created>
                <updated>Sat, 19 Nov 2016 00:06:22 +0000</updated>
                            <resolved>Mon, 14 Nov 2016 21:35:06 +0000</resolved>
                                                    <fixVersion>3.4.0-rc4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1433783" author="xgen-internal-githook" created="Mon, 14 Nov 2016 21:34:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;EshaMaharishi&apos;, u&apos;name&apos;: u&apos;Esha Maharishi&apos;, u&apos;email&apos;: u&apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &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; check and return early if shard already exists in addShard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e82b201cf7d17f64f54b57f58dc9668527ab49b1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e82b201cf7d17f64f54b57f58dc9668527ab49b1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1416882" author="esha.maharishi@10gen.com" created="Tue, 25 Oct 2016 14:57:35 +0000"  >&lt;p&gt;Potential fix: call ReplicaSetMonitor::remove() for the removed shard in the OpObserver for removes to config.shards.&lt;/p&gt;</comment>
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            <issuekey id="326964">SERVER-26785</issuekey>
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