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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-42141] Implement sharded metadata updates for refineCollectionShardKey without using a transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-42141</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Without using a transaction, implement the sharded metadata changes necessary for refining a shard key during the refineCollectionShardKeyCommand to enable testing without failover or concurrent refreshes.&lt;/p&gt;

&lt;p&gt;Add linear jstests that verify the new sharded collection works as expected.&lt;/p&gt;

&lt;p&gt;Proposed Implementation&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Add a new method to ShardingCatalogManager called &lt;tt&gt;refineCollectionShardKey&lt;/tt&gt; in sharding_catalog_manager_collection_operations.cpp and call it at the end of _configsvrRefineCollectionShardKey&lt;/li&gt;
	&lt;li&gt;This method should:
	&lt;ol&gt;
		&lt;li&gt;Lock the chunk and zone op resource mutexes&lt;/li&gt;
		&lt;li&gt;Update the config.collections entry for the given namespace by setting its shard key to the refined key and its epoch to a newly generated object id.&lt;/li&gt;
		&lt;li&gt;Use a multi-update that sets a default value of MinKey in the bounds for each chunk for the given namespace in config.chunks for each new field in the refined key, sets each chunk&apos;s epoch to the new collection epoch, and unsets the jumbo field.
		&lt;ol&gt;
			&lt;li&gt;e.g. when refining the key from {a: 1} to {a: 1, b: 1, c: 1}:&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; config.chunks.update({ns: &amp;lt;given ns&amp;gt;}, {$set: {lastmodEpoch: &amp;lt;new epoch&amp;gt;}, $max: {min.b: MinKey, min.c: MinKey, max.b: MinKey, max.c: MinKey}, $unset: {jumbo: &quot;&quot;}});&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;/li&gt;
		&lt;/ol&gt;
		&lt;/li&gt;
		&lt;li&gt;Fix the off-by-one error from the previous query by setting the values of max bound for the new shard key fields of the global max chunk to MaxKey (i.e. the chunk with MaxKey values for every shard key field from before the refine).&lt;/li&gt;
		&lt;li&gt;Update the bounds of each zone document for the given collection in config.tags using a similar query to the one from step 3.&lt;/li&gt;
		&lt;li&gt;If the max bound for a zone range is the global max, set the default values for its max bound to MaxKey.&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
	&lt;li&gt;Add integration testing that:
	&lt;ol&gt;
		&lt;li&gt;Before and after a refine, CRUD operations work as expected and no data is lost.
		&lt;ol&gt;
			&lt;li&gt;Including versioned reads against secondaries.&lt;/li&gt;
		&lt;/ol&gt;
		&lt;/li&gt;
		&lt;li&gt;Before and after a refine move, split, and merge operations work as expected and require the full shard key if the user manually specifies bounds.&lt;/li&gt;
		&lt;li&gt;After a refine, forcing a refresh on each shard (to simulate the asynchronous setShardVersion task completing) does not corrupt data and after the refine inserts of documents without the full shard key are rejected.&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="850318">SERVER-42141</key>
            <summary>Implement sharded metadata updates for refineCollectionShardKey without using a transaction</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="jamie.heppenstall@mongodb.com">James Heppenstall</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Jul 2019 16:05:17 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:12 +0000</updated>
                            <resolved>Thu, 25 Jul 2019 21:38:25 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2344675" author="xgen-internal-githook" created="Thu, 25 Jul 2019 21:36:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jamie Heppenstall&apos;, &apos;email&apos;: &apos;jamie.heppenstall@mongodb.com&apos;, &apos;username&apos;: &apos;JamesHeppenstall&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42141&quot; title=&quot;Implement sharded metadata updates for refineCollectionShardKey without using a transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42141&quot;&gt;&lt;del&gt;SERVER-42141&lt;/del&gt;&lt;/a&gt; Implement sharded metadata updates for refineCollectionShardKey without using a transaction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d3d8a901b72c3088c360d9c72fad1b4fc08e5eda&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d3d8a901b72c3088c360d9c72fad1b4fc08e5eda&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
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                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
                                        <issuelink>
            <issuekey id="850322">SERVER-42142</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="850325">SERVER-42143</issuekey>
        </issuelink>
                            </outwardlinks>
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