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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-42299] Upgrade/downgrade for config.chunks and config.tags</title>
                <link>https://jira.mongodb.org/browse/SERVER-42299</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For refine a collection&apos;s shard key, the formats of documents in config.chunks and config.tags were changed to allow updating their min boundaries without needing to update their _ids. In particular, _id in config.chunks is no longer a string concatenation of namespace and minbound and _id in config.tags is no longer an object containing namespace and minbound.&lt;/p&gt;

&lt;p&gt;As part of this ticket, the server should be changed to:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Gate the new format on FCV 4.4 and change the BSONField for the ChunkType class to expect _id as an OID
	&lt;ul&gt;
		&lt;li&gt;Note &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42106&quot; title=&quot;Use auto-generated _ids for config.chunks and config.tags&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42106&quot;&gt;&lt;del&gt;SERVER-42106&lt;/del&gt;&lt;/a&gt; made _id a string representation of an OID to defer upgrade/downgrade work until this ticket&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Upgrade (through setFeatureCompatibilityVersion command) should iterate through each document in config.chunks and config.tags and change their _ids to be in the new format&lt;/li&gt;
	&lt;li&gt;Vice versa for downgrade through setFCV&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In addition to basic integration testing, add integration coverage to ensure migrations in mixed binary version clusters work and that zone boundaries are respected before and after an upgrade/downgrade.&lt;/p&gt;</description>
                <environment></environment>
        <key id="868635">SERVER-42299</key>
            <summary>Upgrade/downgrade for config.chunks and config.tags</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Jul 2019 15:32:01 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:57 +0000</updated>
                            <resolved>Wed, 16 Oct 2019 20:11:15 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2485596" author="xgen-internal-githook" created="Wed, 16 Oct 2019 19:50:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jsmulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;name&apos;: &apos;Jack Mulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42299&quot; title=&quot;Upgrade/downgrade for config.chunks and config.tags&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42299&quot;&gt;&lt;del&gt;SERVER-42299&lt;/del&gt;&lt;/a&gt; Batch chunk and tag upgrade/downgrade modification transactions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/71fd21e91f9f7da71ddfd25fc3c021760e04953b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/71fd21e91f9f7da71ddfd25fc3c021760e04953b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2483797" author="xgen-internal-githook" created="Tue, 15 Oct 2019 21:11:02 +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-42299&quot; title=&quot;Upgrade/downgrade for config.chunks and config.tags&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42299&quot;&gt;&lt;del&gt;SERVER-42299&lt;/del&gt;&lt;/a&gt; Upgrade/downgrade for config.chunks and config.tags&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c2af35bc34c6ee187f05246cd8eefcac42fc01c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c2af35bc34c6ee187f05246cd8eefcac42fc01c9&lt;/a&gt;&lt;/p&gt;</comment>
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                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="970651">SERVER-44034</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="971455">DOCS-13127</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                                                <inwardlinks description="has to be done after">
                                        <issuelink>
            <issuekey id="771430">SERVER-41230</issuekey>
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                            <customfieldvalue>This patch disabled chunk migrations, splits, and merges while the setFeatureCompatibilityVersion command is running on the config server primary in a sharded cluster. Running each command during this window will fail with `ConflictingOperationInProgress`.</customfieldvalue>

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