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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-44382] Allow upserting a document that is missing a shard key field</title>
                <link>https://jira.mongodb.org/browse/SERVER-44382</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42390&quot; title=&quot;Allow documents in a sharded collection to not contain all shard key fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42390&quot;&gt;&lt;del&gt;SERVER-42390&lt;/del&gt;&lt;/a&gt; allowed users to insert documents that are missing shard key fields and unset shard key fields through an update. An upsert that doesn&apos;t match an existing document takes a different code path than other updates, which currently incorrectly will reject a write that would result in a document without a shard key field because of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/384292b85c/src/mongo/db/exec/update_stage.cpp#L474-L481&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this check&lt;/a&gt;. Instead, the upsert path should only assert the shard key paths do not contain arrays and that _id is present and does not contain an array.&lt;/p&gt;

&lt;p&gt;Note that mongos will still require an upsert to have all shard key fields. This ticket allows upserts where the query portion has the full shard key but the update causes the document to end up missing shard key fields to succeed. Two ways this can happen are if the&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/75f9277a30/jstests/sharding/upsert_sharded.js#L57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replacement doc is missing shard key fields&lt;/a&gt; or the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/75f9277a30/jstests/sharding/upsert_sharded.js#L69&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;update unsets shard key fields&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="987830">SERVER-44382</key>
            <summary>Allow upserting a document that is missing a shard key field</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Nov 2019 22:11:14 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:26 +0000</updated>
                            <resolved>Wed, 6 Nov 2019 19:50:08 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2521071" author="xgen-internal-githook" created="Wed, 6 Nov 2019 19:34:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44382&quot; title=&quot;Allow upserting a document that is missing a shard key field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44382&quot;&gt;&lt;del&gt;SERVER-44382&lt;/del&gt;&lt;/a&gt; Allow upserting documents with missing shard key fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4271acb624b7654afd9a7c81efaf884a5a30642a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4271acb624b7654afd9a7c81efaf884a5a30642a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="991869">DOCS-13205</issuekey>
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            <issuekey id="874541">SERVER-42390</issuekey>
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                            <customfieldvalue>This ticket fixed a bug in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42390&quot; title=&quot;Allow documents in a sharded collection to not contain all shard key fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42390&quot;&gt;&lt;strike&gt;SERVER-42390&lt;/strike&gt;&lt;/a&gt; that didn&amp;#39;t allow upserted documents to have missing shard key fields. The behavior is the same as should have been communicated through &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42390&quot; title=&quot;Allow documents in a sharded collection to not contain all shard key fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42390&quot;&gt;&lt;strike&gt;SERVER-42390&lt;/strike&gt;&lt;/a&gt;&amp;#39;s downstream changes, I only gave this ticket downstream changes to make sure it&amp;#39;s clear the bug wasn&amp;#39;t the intentional behavior.</customfieldvalue>

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&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;   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;// Assuming foo.bar is a sharded collection with shard key &quot;skey&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;const sessionColl = db.getMongo().startSession({retryWrite: true}).getDatabase(&quot;foo&quot;);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;sessionColl.bar.update({skey: 10}, {a: 1}, {upsert: true}); // Fails with NoSuchKey&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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