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    <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-73398] Invariant may be hit when downgrading from v6.0 due to moveChunk request without max key</title>
                <link>https://jira.mongodb.org/browse/SERVER-73398</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the balancer round the FCV is checked twice in the following order:&lt;/p&gt;

&lt;p&gt;&lt;b&gt;A)&lt;/b&gt; On the selectChunksToMove phase: we check &lt;a href=&quot;https://github.com/10gen/mongo/blob/a71e6f82149e19001ac75af9cb8bcbd3b35219ac/src/mongo/db/s/balancer/balancer_chunk_selection_policy_impl.cpp#L454-L457&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if gBalanceAccordingToDataSize flag is enabled&lt;/a&gt;, which is enabled on FCV6.0 and disabled on FCV5.0. If the flag is enabled, we &lt;a href=&quot;https://github.com/10gen/mongo/blob/3d7cb234e07f7d6e027f0c355fc6bd8aa9e1f965/src/mongo/db/s/balancer/balancer_policy.cpp#L852&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;don&apos;t store the max key value of the chunk to migrate&lt;/a&gt;&#160; since we want to call &lt;tt&gt;moveRange&lt;/tt&gt; intentionally without the max key in order to leave the decision of how much data migrate in hands of the shard.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;B)&lt;/b&gt; On the moveChunks phase: we check &lt;a href=&quot;https://github.com/10gen/mongo/blob/3d7cb234e07f7d6e027f0c355fc6bd8aa9e1f965/src/mongo/db/s/balancer/balancer.cpp#L1038-L1039&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;if FCV is 6.0 or not&lt;/a&gt; to either send a &lt;tt&gt;moveRange&lt;/tt&gt; or a &lt;tt&gt;moveChunk&lt;/tt&gt; command to the shard that owns the chunk.&lt;/p&gt;

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

&lt;p&gt;In case of having a downgrade FCV in between A and B, the &lt;tt&gt;moveChunk&lt;/tt&gt; command request will be scheduled without a max key value and this &lt;a href=&quot;https://github.com/10gen/mongo/blob/3d7cb234e07f7d6e027f0c355fc6bd8aa9e1f965/src/mongo/db/s/balancer/balancer_commands_scheduler_impl.cpp#L259&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; will be hit.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2245403">SERVER-73398</key>
            <summary>Invariant may be hit when downgrading from v6.0 due to moveChunk request without max key</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 27 Jan 2023 13:57:52 +0000</created>
                <updated>Sun, 29 Oct 2023 21:27:15 +0000</updated>
                            <resolved>Mon, 30 Jan 2023 21:50:48 +0000</resolved>
                                    <version>6.0.3</version>
                    <version>6.0.4</version>
                                    <fixVersion>6.0.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5152721" author="xgen-internal-githook" created="Mon, 30 Jan 2023 21:16:38 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73398&quot; title=&quot;Invariant may be hit when downgrading from v6.0 due to moveChunk request without max key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73398&quot;&gt;&lt;del&gt;SERVER-73398&lt;/del&gt;&lt;/a&gt; always invoke moveChunk when both bounds are set&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/61c1c2e9660b3d6b9fc05f0906109bcdb556c67e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/61c1c2e9660b3d6b9fc05f0906109bcdb556c67e&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2028865">SERVER-65816</issuekey>
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