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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-65281] AutoSplitVector should never choose null fields as split points</title>
                <link>https://jira.mongodb.org/browse/SERVER-65281</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The AutoSplitVector command chooses split points by scanning the documents in a collection and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/25e8869840f32dd59c89ad7527d06d42f9fb4f42/src/mongo/db/s/auto_split_vector.cpp#L231&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;choosing the new split point to be the shard key values of the first document that makes the chunk too large&lt;/a&gt;. If this document has any of the shard key values unset or set to null, this will result in the new chunk having a max key that doesn&apos;t have the right number of key values. We should modify the AutoSplitVector so that it never chooses null values as a split point.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2017955">SERVER-65281</key>
            <summary>AutoSplitVector should never choose null fields as split points</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="13203">Gone away</resolution>
                                        <assignee username="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="allison.easton@mongodb.com">Allison Easton</reporter>
                        <labels>
                    </labels>
                <created>Wed, 6 Apr 2022 09:20:11 +0000</created>
                <updated>Fri, 27 Oct 2023 20:45:32 +0000</updated>
                            <resolved>Thu, 7 Apr 2022 07:32:43 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4463505" author="allison.easton" created="Thu, 7 Apr 2022 07:32:43 +0000"  >&lt;p&gt;Closing this since it isn&apos;t the cause of the BF, and the actual cause has not yet been identified. Will reopen the BF ticket to continue investigation.&lt;/p&gt;</comment>
                            <comment id="4461117" author="allison.easton" created="Wed, 6 Apr 2022 14:18:58 +0000"  >&lt;p&gt;The error happening in the test is this&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;BadValue: min and max don&apos;t have the same number of keys: { key: -5000.0, key1: MinKey }, { key: 2000.0 }&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;I had thought that committing a chunk split where the value of key2 was null was causing this, but in writing a test to reproduce the error, this doesn&apos;t seem to be the case. I will update the ticket&apos;s summary once I figure out the actual cause.&lt;br/&gt;
Sorry for the confusion, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4460685" author="max.hirschhorn@10gen.com" created="Wed, 6 Apr 2022 11:58:22 +0000"  >&lt;blockquote&gt;
&lt;p&gt;this will result in the new chunk having a max key that doesn&apos;t have the right number of key values&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Is this because autoSplitVector isn&apos;t treating a missing shard key field as if it were an explicit null value? I&apos;m a little confused by this ticket&apos;s description because I don&apos;t see how an explicit null value is any more special than an explicit boolean true value (or something like that) to the chunk&amp;#45;splitting logic.&lt;/p&gt;</comment>
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