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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-12900] moveChunk failed to engage TO-shard in the data transfer: still waiting for a previous migrates data to get cleaned, can&apos;t accept new chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-12900</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;ve been having a problem all day with my MongoDB cluster getting stuck while migrating chunks.&lt;/p&gt;

&lt;p&gt;This is a 8 shard cluster, MongoDB 2.4.6, with each shard a 5 member replica set. I have 2 shards both trying to migrate chunks:&lt;/p&gt;

&lt;p&gt;first primary:&lt;/p&gt;

&lt;p&gt;Feb 25 20:46:55 terranova mongod.10001&lt;span class=&quot;error&quot;&gt;&amp;#91;19778&amp;#93;&lt;/span&gt;: Tue Feb 25 20:46:55.986 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn4194&amp;#93;&lt;/span&gt; command admin.$cmd command: { moveChunk: &quot;current.reviews&quot;, from: &quot;rs1/mongors1-2.redacted.com:10001,mongors1-3.redacted.com:10001,terranova.redacted.com:10001&quot;, to: &quot;rs3/bastoni.redacted.com:10003,mongors3-2.redacted.com:10003,mongors3-3.redacted.com:10003&quot;, fromShard: &quot;rs1&quot;, toShard: &quot;rs3&quot;, min: &lt;/p&gt;
{ location_id: ObjectId(&apos;52a75b4738fc9d23e88ab516&apos;) }
&lt;p&gt;, max: &lt;/p&gt;
{ location_id: ObjectId(&apos;52a75b4814b0f61b64acffc8&apos;) }
&lt;p&gt;, maxChunkSizeBytes: 67108864, shardId: &quot;current.reviews-location_id_ObjectId(&apos;52a75b4738fc9d23e88ab516&apos;)&quot;, configdb: &quot;terranova.redacted.com:30000,giordano.redacted.com:30000,bastoni.redacted.com:30000&quot;, secondaryThrottle: true, waitForDelete: false } ntoreturn:1 keyUpdates:0 locks(micros) W:3854 r:85284 reslen:343 559ms&lt;/p&gt;

&lt;p&gt;8th primary:&lt;/p&gt;

&lt;p&gt;Feb 25 20:47:40 MongoRS8-1 mongod.10008&lt;span class=&quot;error&quot;&gt;&amp;#91;31876&amp;#93;&lt;/span&gt;: Tue Feb 25 20:47:40.430 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn1993&amp;#93;&lt;/span&gt; received moveChunk request: { moveChunk: &quot;current.citations&quot;, from: &quot;rs8/mongors8-1.redacted.com:10008,mongors8-2.redacted.com:10008,mongors8-3.redacted.com:10008&quot;, to: &quot;rs4/mongors4-1.redacted.com:10004,mongors4-2.redacted.com:10004,mongors4-3.redacted.com:10004&quot;, fromShard: &quot;rs8&quot;, toShard: &quot;rs4&quot;, min: &lt;/p&gt;
{ location_id: ObjectId(&apos;4f2703f0bc0f367032000000&apos;) }
&lt;p&gt;, max: &lt;/p&gt;
{ location_id: ObjectId(&apos;4f3533ffbc0f36d419000002&apos;) }
&lt;p&gt;, maxChunkSizeBytes: 67108864, shardId: &quot;current.citations-location_id_ObjectId(&apos;4f2703f0bc0f367032000000&apos;)&quot;, configdb: &quot;terranova.redacted.com:30000,giordano.redacted.com:30000,bastoni.redacted.com:30000&quot;, secondaryThrottle: true, waitForDelete: false }&lt;/p&gt;

&lt;p&gt;On both primaries I am seeing:&lt;/p&gt;

&lt;p&gt;warning: moveChunk failed to engage TO-shard in the data transfer: still waiting for a previous migrates data to get cleaned, can&apos;t accept new chunks, num threads: 39&lt;/p&gt;

&lt;p&gt;In the last 6 hours, 3 chunks have managed to migrate.&lt;/p&gt;

&lt;p&gt;I have bounced mongos&apos;s, bounced mongod&apos;s. Stopped the balancer, removed the {_id: &quot;balancer&quot;} lock from the config db, bounced the mongos&apos;s, reenabled the balancer. &lt;/p&gt;

&lt;p&gt;Not seeing anything out of the ordinary on the receivers.&lt;/p&gt;

&lt;p&gt;Strange thing, is that 3 chunks have been able to migrate amidst this issue. The errors disappear, there is some chunk migration log messages, it finished, and then the errors start up again.&lt;/p&gt;</description>
                <environment></environment>
        <key id="114588">SERVER-12900</key>
            <summary>moveChunk failed to engage TO-shard in the data transfer: still waiting for a previous migrates data to get cleaned, can&apos;t accept new chunks</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="-1">Unassigned</assignee>
                                    <reporter username="quickdry21">Eric Coutu</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Feb 2014 22:46:17 +0000</created>
                <updated>Fri, 26 Sep 2014 16:57:57 +0000</updated>
                            <resolved>Fri, 26 Sep 2014 16:57:57 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="505630" author="quickdry21" created="Wed, 26 Feb 2014 14:48:23 +0000"  >&lt;p&gt;#4 is hidden and #5 is an arbiter. Not sure if this is the proper link for you, but &lt;a href=&quot;https://mms.mongodb.com/host/list/4fe1eaeb87d1d86fa8bb6d7b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mms.mongodb.com/host/list/4fe1eaeb87d1d86fa8bb6d7b&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Seems like the problem has resolved itself overnight. The 2 collections that were way out of balance have transferred their chunks to other shards.&lt;/p&gt;</comment>
                            <comment id="505474" author="asya" created="Wed, 26 Feb 2014 03:44:51 +0000"  >&lt;p&gt;Eric,&lt;/p&gt;

&lt;p&gt;You mention 5 member replica sets but the shards are listed with three members - are the other two hidden?  Arbiters?  or something else?   Is there replication lag in the &quot;TO&quot; shards at all? &lt;/p&gt;

&lt;p&gt;(If this cluster is in MMS and you can provide a link I could look this up myself)&lt;/p&gt;

&lt;p&gt;Asya&lt;/p&gt;</comment>
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