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    <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>[DOCS-12970] Investigate changes in SERVER-42646: Cap splitVector response at max BSONObj size</title>
                <link>https://jira.mongodb.org/browse/DOCS-12970</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

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&lt;p&gt;    The splitVector command (which is used when splitting a chunk) will now stop selecting split points when the number of split points has reached the maximum BSONObj size limit. Previously, it was possible for the size of the chosen points to exceed said limit, and then the splitVector command would fail with &lt;tt&gt;BSONObjectTooLarge&lt;/tt&gt;.&lt;/p&gt;
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&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    The splitVector command will scan a chunk for shard key values to split a chunk at and return an array of chosen points. Currently it is possible for the size of the chosen points to make the response exceed the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9a58f3aaad/src/mongo/bson/util/builder.h#L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;max BSONObj size limit of 16MB&lt;/a&gt;, leading splitVector to fail with &lt;tt&gt;BSONObjectTooLarge&lt;/tt&gt;. When the shard key size limit is removed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42368&quot; title=&quot;Remove max shard key value size limit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42368&quot;&gt;&lt;del&gt;SERVER-42368&lt;/del&gt;&lt;/a&gt;, this will become more likely, so splitVector should be modified to stop selecting split points when they would push the response over the BSON size limit and return the already chosen points. If possible, splitVector should return at least one split point.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
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                <environment></environment>
        <key id="901106">DOCS-12970</key>
            <summary>Investigate changes in SERVER-42646: Cap splitVector response at max BSONObj size</summary>
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                                            <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="andrew.feierabend@mongodb.com">Andrew Feierabend</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-onboarding-candidate</label>
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                <created>Tue, 20 Aug 2019 14:39:24 +0000</created>
                <updated>Mon, 13 Nov 2023 18:17:07 +0000</updated>
                            <resolved>Tue, 9 Jun 2020 19:40:57 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 12 Jun 2020 00:00:00 +0000</due>
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