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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>[SERVER-62926] Change collection lock RAII types to use TenantNamespace</title>
                <link>https://jira.mongodb.org/browse/SERVER-62926</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are a number of RAII types that take collection locks defined in both catalog_raii.h/cpp and db_raii.h,cpp, we should change these classes to use TenantNamespaceOrUUID rather than NamespaceStringOrUUID. Many of these classes wrap one another, so though there are many I think it will be easier to change them in the same commit. These classes are unit tested in both the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/db_raii_test.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DBRAIITestFixture&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/catalog_raii_test.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CatalogRAIITestFixture&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;At this point, we should be able to write a js test that successfully runs concurrent operations on conflicting namespaces but for different tenants. The test can do something like the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Start up a single node replica set (unless &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62880&quot; title=&quot;Use tid field to construct namespace for applyOps and transactions during oplog application&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62880&quot;&gt;&lt;del&gt;SERVER-62880&lt;/del&gt;&lt;/a&gt; is finished, then we should be able to start up a standard 3-node replica set)&lt;/li&gt;
	&lt;li&gt;Create two &quot;tenants&quot; and two connections to the primary node. Set the security token for each tenant on one of the connection (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2955dc981148d52146ae817e79c7197bd5a6da84/jstests/auth/security_token.js#L78-L95&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;security_token.js&lt;/a&gt; for an example of how to create a tenantId and set it on a conn)&lt;/li&gt;
	&lt;li&gt;Run concurrent requests from each connection on collections with the same name and assert each succeeds. We can use failpoints to force a hang after taking the collection lock for a request, that way we can run a request on one connection, wait to hit the failpoint, then run a request that takes a lock in a conflicting mode on the other connection and assert it succeeds, then turn off the failpoint and assert the initial request succeeds. i.e.
&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;   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;// turn on failpoint that forces a hang after taking a lock during renameCollection&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;// send renameCollection on tenantA&apos;s connection for the db.foo collection, wait to hit the failpoint --&amp;gt; rename takes the collection lock in MODE_X lock, so requesting any other lock on the same resource should fail &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;// send some other request i.e. an insert on tenantB&apos;s db.foo collection, assert this succeeds&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;// turn off failpoint, assert rename was successful&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;/ul&gt;
</description>
                <environment></environment>
        <key id="1969593">SERVER-62926</key>
            <summary>Change collection lock RAII types to use TenantNamespace</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-serverless">[DO NOT USE] Backlog - Server Serverless</assignee>
                                    <reporter username="janna.golden@mongodb.com">Janna Golden</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Jan 2022 17:45:13 +0000</created>
                <updated>Tue, 6 Dec 2022 00:36:34 +0000</updated>
                            <resolved>Wed, 6 Apr 2022 17:08:11 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4355835" author="janna.golden" created="Tue, 15 Feb 2022 14:12:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee&quot;&gt;dianna.hohensee&lt;/a&gt; yeah we did consider that, but chose to create these new types (TenantNamespace and TenantDatabaseName) and only use them in catalog data structures which must be tenant aware. However, we&apos;re now reconsidering this approach so may change course.&lt;/p&gt;</comment>
                            <comment id="4344971" author="dianna.hohensee" created="Wed, 9 Feb 2022 14:49:43 +0000"  >&lt;p&gt;I noticed the new TenantDatabaseName work done recently in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61987&quot; title=&quot;Change DatabaseHolder&amp;#39;s map to be keyed by TenantDatabase&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61987&quot;&gt;&lt;del&gt;SERVER-61987&lt;/del&gt;&lt;/a&gt;. Has just changing the internals of NamespaceString/OrUUID been considered, instead of changing the name/class everywhere? Rather than putting Tenant everywhere, just make existing classes Tenant aware. Similarly TenantDatabaseName could be DatabaseName &amp;#8211; that change is already in, though, so it doesn&apos;t matter much for the time being.&lt;/p&gt;

&lt;p&gt;I&apos;m not particularly familiar with what you&apos;re doing with the tenant work. But I&apos;m leery of lower level classes of the codebase being all about tenants. And it would be a ton of code churn.&lt;/p&gt;</comment>
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