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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>[DOCS-12742] Docs for SERVER-39158: Change updates to prefer target by the query</title>
                <link>https://jira.mongodb.org/browse/DOCS-12742</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;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;The ticket changes the routing behaviour for updates on sharded clusters. &lt;/p&gt;

&lt;p&gt;1. Replacement-style updates will now attempt to target by the query first.&lt;/p&gt;

&lt;p&gt;2. If we cannot target a single shard, and if the op is NOT an upsert, we fall back to targeting by the replacement document in order to maintain backwards-compatible behaviour.&lt;/p&gt;

&lt;p&gt;3. If the op is an upsert, then we do NOT fall back to targeting by replacement; an upsert must always target a single shard by query and must have full shard key in query. If we cannot do so, we throw an operation-fatal exception.&lt;/p&gt;

&lt;p&gt;4. This change also enforces the requirement of needing a full shard key in the query to update a shard key value.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;Currently, replacement style updates target using the update rather than the query. We should change this to target using the query instead.&lt;/p&gt;

&lt;p&gt;As of today, we do not allow users to change the shard key for a document. If shard 1 owns the chunk with range (shardKey : min, shardKey : 500) and shard 2 owns the chunk with range (shardKey : 500, shardKey : max) and a user sends &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;
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&lt;p/&gt; the update will be sent to shard 2 and we return &lt;p/&gt;
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&lt;p/&gt; We should actually get an ImmutableField error.&lt;/p&gt;

&lt;p&gt;Once we allow a user to update the shard key for a document (PM-1163), the above update should cause the document to change shards. However, since the update would be sent to shard 2, shard 1 will never actually see this update and the update will not  be applied. &lt;/p&gt;&lt;/blockquote&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;
</description>
                <environment></environment>
        <key id="774775">DOCS-12742</key>
            <summary>Docs for SERVER-39158: Change updates to prefer target by the query</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                            <label>docs-4.2-sharding</label>
                    </labels>
                <created>Wed, 22 May 2019 19:07:53 +0000</created>
                <updated>Mon, 13 Nov 2023 18:20:41 +0000</updated>
                            <resolved>Thu, 22 Aug 2019 23:35:49 +0000</resolved>
                                                    <fixVersion>4.1.12</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></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2383592" author="xgen-internal-githook" created="Thu, 22 Aug 2019 23:34:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12742&quot; title=&quot;Docs for SERVER-39158: Change updates to prefer target by the query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12742&quot;&gt;&lt;del&gt;DOCS-12742&lt;/del&gt;&lt;/a&gt;: 4.2 sharded collection updates&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/1a9eef4200e4860b7e3ba765401b6ea2a7794309&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/1a9eef4200e4860b7e3ba765401b6ea2a7794309&lt;/a&gt;&lt;/p&gt;</comment>
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