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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>
    </build-info>


<item>
            <title>[DOCS-13127] Investigate changes in SERVER-42299: Upgrade/downgrade for config.chunks and config.tags</title>
                <link>https://jira.mongodb.org/browse/DOCS-13127</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;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    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`.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&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;


&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="971455">DOCS-13127</key>
            <summary>Investigate changes in SERVER-42299: 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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-earlyOpen</label>
                            <label>docs-investigating</label>
                    </labels>
                <created>Wed, 16 Oct 2019 20:11:17 +0000</created>
                <updated>Mon, 13 Nov 2023 18:15:03 +0000</updated>
                            <resolved>Wed, 18 Mar 2020 14:22:26 +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>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2984972" author="xgen-internal-githook" created="Wed, 18 Mar 2020 14:22:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12951&quot; title=&quot;Investigate changes in SERVER-42368: Remove max shard key value size limit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12951&quot;&gt;&lt;del&gt;DOCS-12951&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13127&quot; title=&quot;Investigate changes in SERVER-42299: Upgrade/downgrade for config.chunks and config.tags&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13127&quot;&gt;&lt;del&gt;DOCS-13127&lt;/del&gt;&lt;/a&gt;: 4.4 shard key value size, fcv upgrade/downgrade for shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/580eb74530dac39751841a0699da999426320616&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/580eb74530dac39751841a0699da999426320616&lt;/a&gt;&lt;/p&gt;</comment>
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                            <issuelinktype id="10320">
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            <issuekey id="868635">SERVER-42299</issuekey>
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