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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-46363] Chunk move failing after removing shard from cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-46363</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi we are using mongo sharded cluster running with 4.2.1.&lt;/p&gt;

&lt;p&gt;Architecture:&lt;br/&gt;
      3 mongos&lt;br/&gt;
       config server running as replica set ( 1 primary + 2 secondaries)&lt;br/&gt;
      2 shard with 3 nodes running as replica set ( 1 primary + 2 secondaries)&lt;/p&gt;

&lt;p&gt;Since shard1 and shard2 are  under utilized, we  decided to remove shard2.&lt;/p&gt;

&lt;p&gt; we did the following steps&lt;/p&gt;

&lt;p&gt; 1)  we issued remove shard from mongos and also  Moved databases to another shard&lt;/p&gt;

&lt;p&gt; out of 2 sharded collections,  all chunks related to 1 collections are drained to another shard.&lt;br/&gt;
  But chunk migration is failing for another collection.we see Balancer is not moving chunks and it&apos;s throwing following message&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;2020-02-24T15:56:48.481+0000 I  SHARDING [Balancer] distributed lock &apos;keychain.eg_keyring&apos; acquired for &apos;Migrating chunk(s) in collection keychain.eg_keyring&apos;, ts : 5de584eedab8c4c434adabb5&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;2020-02-24T15:56:48.546+0000 I  SHARDING [TransactionCoordinator] distributed lock with ts: &apos;5de584eedab8c4c434adabb5&apos; and _id: &apos;keychain.eg_keyring&apos; unlocked.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;2020-02-24T15:56:48.549+0000 I  SHARDING [Balancer] Balancer move keychain.eg_keyring: [{ rId: UUID(&quot;80460000-0000-0000-0000-000000000000&quot;) }, { rId: UUID(&quot;80480000-0000-0000-0000-000000000000&quot;) }), from test-mongodb-egdp-keychain-01-shard02, to test-mongodb-egdp-keychain-01-shard01 failed :: caused by :: OperationFailed: Data transfer error: migrate failed: Location51008: operation was interrupted&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;2020-02-24T15:56:48.550+0000 I  SHARDING [Balancer] about to log metadata event into actionlog: { _id: &quot;ip-10-0-212-244:27017-2020-02-24T15:56:48.550+0000-5e53f240dab8c4c434ec8b37&quot;, server: &quot;ip-10-0-212-244:27017&quot;, shard: &quot;config&quot;, clientAddr: &quot;&quot;, time: new Date(1582559808550), what: &quot;balancer.round&quot;, ns: &quot;&quot;, details: { executionTimeMillis: 243, errorOccured: false, candidateChunks: 1, chunksMoved: 0 } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;we tried even moving some of chunks manually and they also failed with same reason.&lt;/p&gt;

&lt;p&gt;sh.status() output is attached&lt;/p&gt;

&lt;p&gt;We issued the following command to include chunk info from above sh.status() output to move one chunk&lt;/p&gt;

&lt;p&gt;command:&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;db.adminCommand( { moveChunk : &quot;keychain.eg_keyring&quot; ,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;                 bounds : [{ &quot;rId&quot; : UUID(&quot;80460000-0000-0000-0000-000000000000&quot;) }, { &quot;rId&quot; : UUID(&quot;80480000-0000-0000-0000-000000000000&quot;) }] ,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;                 to : &quot;test-mongodb-egdp-keychain-01-shard01&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;                  } )&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Output:&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;mongos&amp;gt; db.adminCommand( { moveChunk : &quot;keychain.eg_keyring&quot; ,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;...                  bounds : [{ &quot;rId&quot; : UUID(&quot;80460000-0000-0000-0000-000000000000&quot;) }, { &quot;rId&quot; : UUID(&quot;80480000-0000-0000-0000-000000000000&quot;) }] ,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;...                  to : &quot;test-mongodb-egdp-keychain-01-shard01&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;...                   } )&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;{&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;ok&quot; : 0,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;errmsg&quot; : &quot;Data transfer error: migrate failed: Location51008: operation was interrupted&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;code&quot; : 96,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;codeName&quot; : &quot;OperationFailed&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;operationTime&quot; : Timestamp(1582566446, 139),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;$clusterTime&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;clusterTime&quot; : Timestamp(1582566446, 139),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;signature&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;hash&quot; : BinData(0,&quot;jaz2qGWhuM36vt48xNt+mv+CHfo=&quot;),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;keyId&quot; : NumberLong(&quot;6765960194405957649&quot;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;		}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;	}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Apart from this , we also issued flushRouterConfig multiple times and we restarted all mongos. But still same issue exists.&lt;/p&gt;


&lt;p&gt;Please let me know if there is any known bug around this or any configuration that we need to tweak on our side.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1181540">SERVER-46363</key>
            <summary>Chunk move failing after removing shard from cluster</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="13202">Works as Designed</resolution>
                                        <assignee username="carl.champain@mongodb.com">Carl Champain</assignee>
                                    <reporter username="haidilip83@gmail.com">Dilip Kolasani</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Feb 2020 17:48:52 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:56 +0000</updated>
                            <resolved>Wed, 4 Mar 2020 16:10:34 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2934506" author="carl.champain" created="Wed, 4 Mar 2020 16:09:58 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=haidilip83%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;haidilip83@gmail.com&quot;&gt;haidilip83@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for getting back to us! I will now close this ticket.&lt;/p&gt;</comment>
                            <comment id="2932684" author="haidilip83@gmail.com" created="Tue, 3 Mar 2020 17:48:55 +0000"  >&lt;p&gt; Thanks Carl for detailed summary.hypothesis 1 is confirmed. We are  working on enforcing the uniqueness of the _id index on application side.we can now close this ticket.&lt;/p&gt;</comment>
                            <comment id="2918075" author="carl.champain" created="Fri, 28 Feb 2020 20:39:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=haidilip83%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;haidilip83@gmail.com&quot;&gt;haidilip83@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;After investigating your issue, we&#8217;ve come up with two hypotheses:&lt;/p&gt;

&lt;p&gt;1. The _id index key is not unique across your sharded cluster. Our documentation says the following about the uniqueness of the _id index across a sharded cluster:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;If the _id field is not the shard key or the prefix of the shard key, _id index only enforces the uniqueness constraint per shard and not across shards.&lt;br/&gt;
 For example, consider a sharded collection (with shard key {x:1}) that spans two shards A and B. Because the _id key is not part of the shard key, the collection could have a document with _id value 1 in shard A and another document with _id value 1 in shard B.&lt;br/&gt;
 If the _id field is not the shard key nor the prefix of the shard key, MongoDB expects applications to enforce the uniqueness of the _id values across the shards.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;So, in your case, we noticed that _id is neither the shard key nor the prefix of the shard key, which makes it possible that a document on shard2 has the same _id as a document on shard1.&lt;/p&gt;

&lt;p&gt;&#160;&lt;br/&gt;
 2. Shard1 may contain &lt;a href=&quot;https://docs.mongodb.com/manual/reference/glossary/#term-orphaned-document&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;orphan documents&lt;/a&gt;. Orphan documents appear after a failed migration or an unclean shutdown, they can be duplicates of documents that were moved onto a different shard. There are a few ways in which orphan documents would cause a duplicate key error:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If the chunks migration from shard2 to shard1 failed, but some documents were still written on shard1. Then, when shard2 tries to migrate the chunks again, the duplicate error arises because shard1 already contains some documents from shard2.&lt;/li&gt;
	&lt;li&gt;If shard1 crashed after the chunks migration from shard1 to shard2 and while the &lt;a href=&quot;https://github.com/mongodb/mongo/wiki/Sharding-Internals#the-rangedeleter&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;RangeDeleter&lt;/a&gt; was still running. Then, when shard1 goes back online, the RangeDeleter does not persist or replicate the ranges it has yet to clean, so it can&#8217;t restart from where it left off. During the chunks migration from shard2 to shard1, the error comes up since shard1 has orphan documents.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;To determine whether hypothesis 1 or 2 is correct, please &lt;b&gt;connect directly&lt;/b&gt; to the primary replica set member of shard1 and shard2 and run:&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;db.eg_keyring.find({{ _id: UUID(&quot;245a5a22-4eb3-35ab-b79d-6c0bc431f169&quot;) }})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt; 
&lt;ul&gt;
	&lt;li&gt;If the returned documents have the same _id but not the same shard key, then the _id index key is not unique across your sharded cluster and hypothesis 1 is confirmed. You can enforce the uniqueness of the _id index key on your application logic or you can update your shard key. If you need further assistance troubleshooting, I encourage you to ask our community by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;If the returned documents are identical, then shard1 contains orphan documents and hypothesis 2 is confirmed. Please run &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/cleanupOrphaned/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cleanupOrphaned&lt;/a&gt; on the primary replica set member of shard1 to remediate this issue.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Kind regards,&lt;br/&gt;
 Carl&lt;/p&gt;</comment>
                            <comment id="2910432" author="haidilip83@gmail.com" created="Wed, 26 Feb 2020 15:15:38 +0000"  >&lt;p&gt;Please confirm if this is anyway related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45844&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-45844&lt;/a&gt; also?&lt;/p&gt;</comment>
                            <comment id="2908743" author="haidilip83@gmail.com" created="Tue, 25 Feb 2020 22:10:02 +0000"  >&lt;p&gt;Hi Carl,&lt;br/&gt;
 I have uploaded all requested information. &lt;/p&gt;


&lt;p&gt;regards&lt;br/&gt;
Dilip K&lt;/p&gt;</comment>
                            <comment id="2907543" author="carl.champain" created="Tue, 25 Feb 2020 16:30:15 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=haidilip83%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;haidilip83@gmail.com&quot;&gt;haidilip83@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report.&lt;br/&gt;
 To help us understand what is happening, can you please provide:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The logs for:
	&lt;ul&gt;
		&lt;li&gt;Each of the mongos.&lt;/li&gt;
		&lt;li&gt;The primary of shard1 and shard2.&lt;/li&gt;
		&lt;li&gt;The primary of the config servers.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;The &lt;a href=&quot;https://docs.mongodb.com/manual/reference/program/mongodump/#connect-to-a-sharded-cluster&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodump&lt;/a&gt; of your config server:
	&lt;ul&gt;
		&lt;li&gt;The command should look like this: &lt;tt&gt;mongodump --db=config --host=&amp;lt;hostname:port_of _the_mongos&amp;gt;&lt;/tt&gt;&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We&apos;ve created a secure &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/3a9ef638-d507-4590-99ce-93afc907ab8d.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upload portal&lt;/a&gt; for you. Files uploaded to this portal are visible only to MongoDB employees and are routinely deleted after some time.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
 Carl&lt;/p&gt;</comment>
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