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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-31238] Stale mongos nodes can fail moveChunk commands without ever refreshing</title>
                <link>https://jira.mongodb.org/browse/SERVER-31238</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mongos used to send moveChunk directly against the shard, so the shardVersion protocol was in affect and stale mongos nodes would refresh their routing tables and retry.&lt;/p&gt;

&lt;p&gt;However, mongos nodes no longer send moveChunk against a shard node, but rather against the config server. This means that a stale mongos can receive a command like this&lt;/p&gt;
&lt;p/&gt;
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						&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;    moveChunk: nss,&lt;/span&gt;&lt;/pre&gt;
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					&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;    find: {_id: 1},&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;and forward it to the config server with the chunk bounds (MinKey, MaxKey). The config server then forwards it to the shard, which fails it with IncompatibleShardingMetadata, chunk does not exist &#8212; another mongos previously split the chunk. This error passes back through the config server to the mongos, which just fails.&lt;/p&gt;

&lt;p&gt;This is a regression from 3.2: moving the balancer to the config server in v3.4 changed the moveChunk behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="432266">SERVER-31238</key>
            <summary>Stale mongos nodes can fail moveChunk commands without ever refreshing</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="13201">Fixed</resolution>
                                        <assignee username="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Mon, 25 Sep 2017 14:16:57 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:22 +0000</updated>
                            <resolved>Mon, 4 Nov 2019 20:25:41 +0000</resolved>
                                    <version>3.4.9</version>
                    <version>3.5.13</version>
                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3067946" author="matthew.saltz" created="Mon, 4 May 2020 19:52:35 +0000"  >&lt;p&gt;Saw this failure in a 4.0 patch build, and it&apos;s a one-line change, so I think it&apos;s worth backporting&lt;/p&gt;</comment>
                            <comment id="2494660" author="xgen-internal-githook" created="Tue, 22 Oct 2019 15:19:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;janna.golden@mongodb.com&apos;, &apos;name&apos;: &apos;Janna Golden&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31238&quot; title=&quot;Stale mongos nodes can fail moveChunk commands without ever refreshing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31238&quot;&gt;&lt;del&gt;SERVER-31238&lt;/del&gt;&lt;/a&gt; Add awaitLastOpTimeCommitted between split and move chunk commands in multi_mongos2.js&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f21fbad4a68fb9447a26c355a006e387b9eccd7b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f21fbad4a68fb9447a26c355a006e387b9eccd7b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2492415" author="esha.maharishi@10gen.com" created="Mon, 21 Oct 2019 13:33:38 +0000"  >&lt;p&gt;Note, mongos&apos;s moveChunk command does &lt;a href=&quot;https://github.com/mongodb/mongo/blame/958f8cabe81a9782247a96ccd96b08377afa9005/src/mongo/s/commands/cluster_move_chunk_cmd.cpp#L103&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;force a refresh&lt;/a&gt; before determining what chunk the &lt;tt&gt;find&lt;/tt&gt; argument is in.&lt;/p&gt;</comment>
                            <comment id="1686945" author="dianna.hohensee" created="Mon, 2 Oct 2017 19:44:31 +0000"  >&lt;p&gt;BF-5972 Portrays a similar issue, but is returning StaleShardVersion somehow. Maybe it&apos;s a matter of changing cluster moveChunk&apos;s retry policy and/or making it recreate the command with the correct, newly refreshed bounds (when given the &apos;find&apos; field).&lt;/p&gt;</comment>
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