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    <title>MongoDB Jira</title>
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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-4581] Mongos and mongod keep trying to reconnect to removed shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-4581</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When you remove a shard, it seems that the the metadata associated with the removed shard doesn&apos;t get cleaned up, so if that shard is taken offline, the mongoses and the other shards will keep trying to reconnect.&lt;/p&gt;</description>
                <environment></environment>
        <key id="27420">SERVER-4581</key>
            <summary>Mongos and mongod keep trying to reconnect to 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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Dec 2011 18:18:28 +0000</created>
                <updated>Mon, 11 Jul 2016 18:35:21 +0000</updated>
                            <resolved>Fri, 15 Jun 2012 13:48:22 +0000</resolved>
                                    <version>2.0.2</version>
                                    <fixVersion>2.1.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="132994" author="auto" created="Fri, 15 Jun 2012 00:07:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-06-12T08:25:46-07:00&apos;, u&apos;email&apos;: u&apos;spencer@10gen.com&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;}
&lt;p&gt;Message: Remove connections to removed shard from connection pools. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4581&quot; title=&quot;Mongos and mongod keep trying to reconnect to removed shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4581&quot;&gt;&lt;del&gt;SERVER-4581&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/93c8997b3df1492a90ec41b97ec3193c49f460d5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/93c8997b3df1492a90ec41b97ec3193c49f460d5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="131308" author="auto" created="Tue, 12 Jun 2012 21:22:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-03-26T11:31:33-07:00&apos;, u&apos;email&apos;: u&apos;spencer@10gen.com&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;}
&lt;p&gt;Message: Clean up ReplicaSetMonitor when the whole set has been down for a long time. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4581&quot; title=&quot;Mongos and mongod keep trying to reconnect to removed shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4581&quot;&gt;&lt;del&gt;SERVER-4581&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ab21eeb9443c41455a18f3ff7016166a16a6425&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ab21eeb9443c41455a18f3ff7016166a16a6425&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="104046" author="spencer" created="Tue, 27 Mar 2012 17:40:25 +0000"  >&lt;p&gt;This is also a problem for the mongos.&lt;/p&gt;</comment>
                            <comment id="76893" author="eliot" created="Fri, 30 Dec 2011 21:17:28 +0000"  >&lt;p&gt;The 2nd is definitely better.&lt;br/&gt;
Then can just cycle through write back listener threads and kill any that aren&apos;t needed anymore.&lt;/p&gt;</comment>
                            <comment id="76869" author="spencer" created="Fri, 30 Dec 2011 19:38:04 +0000"  >&lt;p&gt;I see two possible approaches to solving this.  Currently the removeShard command doesn&apos;t ever get sent to the actual shards, only to the mongos.  One option is to have the removeShard command on the mongos call a removeShard command on each shard to tell it to remove its metadata associated with the removed shard.  The other option is to have the shard reload the sharding info after some number of failed attempts to reconnect to a down shard.  I&apos;m leaning towards the latter right now, as is probably a good idea to have some kind of behavior like this anyway.&lt;/p&gt;</comment>
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