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    <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-54979] Calling move/split/mergeChunk after one another from different MongoS is not causally consistent </title>
                <link>https://jira.mongodb.org/browse/SERVER-54979</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Note: This is not a correctness bug, just an annoyance for tests and for people who do manual chunk operations outside of the Balancer.&lt;/p&gt;

&lt;p&gt;The move/split/mergeChunk set of commands only involve the chunk&apos;s owner shard and the config server, but they don&apos;t propagate any kind of causality token to the client, similar to causally-consistent writes for example.&lt;/p&gt;

&lt;p&gt;This means that if one issues a &lt;tt&gt;split&lt;/tt&gt; on one MongoS and then &lt;tt&gt;move&lt;/tt&gt; from another, the &lt;tt&gt;move&lt;/tt&gt; may actually not see the effects of the split and return an error that chunk with the exact specified bounds doesn&apos;t exist.&lt;/p&gt;

&lt;p&gt;This is not a problem for the Balancer, because (a) it always runs on the config server primary, which is as up-to-date as can be and (b) because it almost always runs on the same node.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1640575">SERVER-54979</key>
            <summary>Calling move/split/mergeChunk after one another from different MongoS is not causally consistent </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="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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Fri, 5 Mar 2021 07:49:05 +0000</created>
                <updated>Thu, 26 Oct 2023 10:22:56 +0000</updated>
                                            <version>3.6.22</version>
                    <version>4.2.12</version>
                    <version>4.0.23</version>
                    <version>4.4.4</version>
                    <version>4.9.0-alpha4</version>
                    <version>5.0.1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3987291" author="xgen-internal-githook" created="Sun, 8 Aug 2021 10:46:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Simon Graetzer&apos;, &apos;email&apos;: &apos;simon.gratzer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54979&quot; title=&quot;Calling move/split/mergeChunk after one another from different MongoS is not causally consistent &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54979&quot;&gt;SERVER-54979&lt;/a&gt; Let chunkSplit+ splitVector participate in the shard versioning protocol&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8974dbdec0286ac47086b794c49214a9f26677bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8974dbdec0286ac47086b794c49214a9f26677bc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3957885" author="kaloian.manassiev" created="Thu, 22 Jul 2021 16:13:55 +0000"  >&lt;p&gt;Passing on to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=simon.gratzer&quot; class=&quot;user-hover&quot; rel=&quot;simon.gratzer&quot;&gt;simon.gratzer&lt;/a&gt; to confirm that with his changes for split/merge to participate in the shard versioning protocol, this has now gone away.&lt;/p&gt;</comment>
                            <comment id="3695689" author="kaloian.manassiev" created="Thu, 1 Apr 2021 08:52:28 +0000"  >&lt;p&gt;There is really no good way to fix this other than making all refreshes from the MongoS to be linearisable so they always read from the latest primary in order to ensure they see all the previous effects.&lt;/p&gt;

&lt;p&gt;Given that this is just a rare annoyance for tests, I am putting this for sharding/product sync to get a permission to close it as Won&apos;t Fix.&lt;/p&gt;</comment>
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