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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-12437] Docs for TOOLS-1862: Revise UUID support for MongoDB 4.0</title>
                <link>https://jira.mongodb.org/browse/DOCS-12437</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;p&gt;Correction to auto-gen&apos;ed ticket:  For 4.0+ mongorestore (and not 3.6)&lt;/p&gt;

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


&lt;p&gt;Adding a new flag &lt;tt&gt;--preserveUUIDs&lt;/tt&gt; to mongorestore.  Plus, the whole topic of UUID preservation (or not) probably needs its own section in the docs.&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;The approach in &lt;a href=&quot;https://jira.mongodb.org/browse/TOOLS-1813&quot; title=&quot;Minimal UUID support for 3.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;TOOLS-1813&quot;&gt;&lt;del&gt;TOOLS-1813&lt;/del&gt;&lt;/a&gt; turns out to have a number of edge cases that need to be fixed.&lt;/p&gt;

&lt;p&gt;For mongodump:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Ensure UUIDs are dumped to collection metadata (probably just writing a test for existing behavior) (&lt;a href=&quot;https://jira.mongodb.org/browse/TOOLS-1815&quot; title=&quot;Capture UUID in collection metadata&quot; class=&quot;issue-link&quot; data-issue-key=&quot;TOOLS-1815&quot;&gt;&lt;del&gt;TOOLS-1815&lt;/del&gt;&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;&lt;del&gt;Ensure an error occurs if rename is seen during oplog dumping (probably just confirming existing tests/behavior)&lt;/del&gt; (&lt;b&gt;confirmed&lt;/b&gt;)&lt;/li&gt;
	&lt;li&gt;Ensure an error occurs if FCV is modified during oplog dumping (new behavior) (&lt;a href=&quot;https://jira.mongodb.org/browse/TOOLS-1818&quot; title=&quot;Abort dump if feature compatibility version changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;TOOLS-1818&quot;&gt;&lt;del&gt;TOOLS-1818&lt;/del&gt;&lt;/a&gt;)
	&lt;ul&gt;
		&lt;li&gt;A shortcut might be to error on any modification to &lt;tt&gt;admin.system.version&lt;/tt&gt;&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;For mongorestore:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Add a &lt;tt&gt;--preserveUUIDs&lt;/tt&gt; flag (&lt;a href=&quot;https://jira.mongodb.org/browse/TOOLS-1817&quot; title=&quot;Add &amp;#39;preserveUUIDs&amp;#39; flag to restore collections with existing UUIDS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;TOOLS-1817&quot;&gt;&lt;del&gt;TOOLS-1817&lt;/del&gt;&lt;/a&gt; &amp;#8211; may come after 3.6 GA unless we can fit it in)&lt;/li&gt;
	&lt;li&gt;With &lt;tt&gt;--preserveUUIDs&lt;/tt&gt;, have the following behaviors:
	&lt;ul&gt;
		&lt;li&gt;Require the &lt;tt&gt;--drop&lt;/tt&gt; flag or abort&lt;/li&gt;
		&lt;li&gt;Require collection metadata to contain UUID info or abort&lt;/li&gt;
		&lt;li&gt;Require the destination to be in FCV 3.6 or abort (&lt;b&gt;MUST check both ways that FCV could appear&lt;/b&gt;)&lt;/li&gt;
		&lt;li&gt;Create collections with the desired UUID with a synthesized &lt;tt&gt;applyOps&lt;/tt&gt; command
		&lt;ul&gt;
			&lt;li&gt;Follow procedure in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31906&quot; title=&quot;Test that applyOps can clone admin.system.version preserving its UUID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31906&quot;&gt;&lt;del&gt;SERVER-31906&lt;/del&gt;&lt;/a&gt; for creating &lt;tt&gt;admin.system.version&lt;/tt&gt; with a given UUID&lt;/li&gt;
		&lt;/ul&gt;
		&lt;/li&gt;
		&lt;li&gt;Apply oplog without modification&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Without &lt;tt&gt;--preserveUUIDs&lt;/tt&gt;, have the following behaviors:
	&lt;ul&gt;
		&lt;li&gt;Strip UUID information when creating missing collections (probably just needs a test confirming restored collections are different)&lt;/li&gt;
		&lt;li&gt;When applying oplog entries, remove UUID related fields
		&lt;ul&gt;
			&lt;li&gt;Remove top level &lt;tt&gt;&apos;ui&apos;&lt;/tt&gt; field&lt;/li&gt;
			&lt;li&gt;Remove &lt;tt&gt;&#8216;o.dropTarget&#8217;&lt;/tt&gt; in &lt;tt&gt;op:&#8217;c&#8217;&lt;/tt&gt; entries where &lt;tt&gt;&#8216;o.renameCollection&#8217;&lt;/tt&gt; exists&lt;/li&gt;
			&lt;li&gt;Recurse stripping into nested ops in &lt;tt&gt;op:&apos;c&apos;&lt;/tt&gt; entries where &lt;tt&gt;&apos;o.applyOps&apos;&lt;/tt&gt; exists&lt;/li&gt;
		&lt;/ul&gt;
		&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&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="685268">DOCS-12437</key>
            <summary>Docs for TOOLS-1862: Revise UUID support for MongoDB 4.0</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="3">Duplicate</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Feb 2019 13:50:16 +0000</created>
                <updated>Mon, 30 Oct 2023 20:46:25 +0000</updated>
                            <resolved>Thu, 12 Dec 2019 16:45:33 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10320">
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                                        <issuelink>
            <issuekey id="457299">TOOLS-1862</issuekey>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="685269">DOCS-12438</issuekey>
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