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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-22648] move existing removeShard procedure into _configsvrRemoveShard</title>
                <link>https://jira.mongodb.org/browse/SERVER-22648</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="265857">SERVER-22648</key>
            <summary>move existing removeShard procedure into _configsvrRemoveShard</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="crystal.horn@mongodb.com">Crystal Horn</reporter>
                        <labels>
                            <label>AdiZ</label>
                            <label>PM-108</label>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Tue, 16 Feb 2016 20:50:54 +0000</created>
                <updated>Thu, 26 Oct 2023 10:18:23 +0000</updated>
                                                                            <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1325625" author="esha.maharishi@10gen.com" created="Fri, 15 Jul 2016 18:04:38 +0000"  >&lt;p&gt;This is necessary mainly to cancel pending upsertShardIdentityForAddShard tasks on the primary config.&lt;/p&gt;

&lt;p&gt;If we did not do this, those tasks would continue to reschedule themselves on the thread pool executor indefinitely, and could only be stopped be restarting the primary config.&lt;/p&gt;</comment>
                            <comment id="1309920" author="esha.maharishi@10gen.com" created="Wed, 29 Jun 2016 17:57:15 +0000"  >&lt;p&gt;Note: We decided to change removeShard to delete the shardIdentity document (option 2).&lt;/p&gt;</comment>
                            <comment id="1261177" author="spencer" created="Tue, 10 May 2016 19:48:33 +0000"  >&lt;p&gt;As far as I can tell the options here are to&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Do nothing.  Removing a shard will still work, but you won&apos;t be able to re-add that shard to a different sharded cluster or with a different shard name (unless you manually restart the shard without --shardsvr, remove the shardIdentity document, then restart it with --shardsvr again).  Should still be possible to re-add the shard to the same cluster so long as it has the same shard name.&lt;/li&gt;
	&lt;li&gt;Add a step to the removeShard procedure where the shardIdentity document is removed.
	&lt;ol&gt;
		&lt;li&gt;When the shardIdentity document is removed, clear out all the in-memory sharding state on the mongod.  This would allow this shard to be added to a new cluster or re-added to the same cluster with a different shard name without restarting any processes.&lt;/li&gt;
		&lt;li&gt;Don&apos;t clear the in-memory state when the shardIdentity document is removed.  This would mean that in order to add this shard to a different cluster or with a different name all mongod processes in the shard would need to be bounced.&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I&apos;m kind of leaning towards option #1, which also happens to be the least amount of work.  I&apos;m not sure we really buy much by being able to re-add a previously removed shard.&lt;/p&gt;</comment>
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