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    <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-73606] Remove task executor from TMAB registry</title>
                <link>https://jira.mongodb.org/browse/SERVER-73606</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Tenant Migration Access Blocker has an executor so callers might wait on access blockers using this executor. It was added to the registry &lt;a href=&quot;https://github.com/mongodb/mongo/commit/a22829787f370bd4d7e4fd767517dd616169638e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;last year&lt;/a&gt; as the previous method had deadlock issues. However it added unintended dependencies on numerous modules as including the registry now includes the executor/network stack. As the registry is included by the service context (registry is a decoration on top of the service context) it added a network/executor dependencies in a lot of locations. We want to refactor it to remove this dependency.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2252530">SERVER-73606</key>
            <summary>Remove task executor from TMAB registry</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="didier.nadeau@mongodb.com">Didier Nadeau</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Feb 2023 19:00:49 +0000</created>
                <updated>Tue, 14 Nov 2023 21:11:35 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5286424" author="JIRAUSER1262830" created="Mon, 20 Mar 2023 21:16:06 +0000"  >&lt;p&gt;Sending this to the backlog as the solution is not as simple as first thought and I don&apos;t have time to work on this at the moment.&lt;/p&gt;</comment>
                            <comment id="5209265" author="JIRAUSER1262830" created="Fri, 17 Feb 2023 23:24:48 +0000"  >&lt;p&gt;Some additional information :&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The dependency of service_context on the executor/network module already existed before &lt;a href=&quot;https://github.com/mongodb/mongo/commit/a22829787f370bd4d7e4fd767517dd616169638e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt; . The access blockers had a `shared_ptr` to an executor which meant service_context had to be linked against the executor/network module (tenant blocker registry depends on access blockers implementation which depends on executor/network)&lt;/li&gt;
	&lt;li&gt;The change does make unit testing more complex as the executor is always constructed and destroyed whenever the `ServiceContext`&apos;s `TenantMigrationAccessBlockerRegistry` decoration is constructed and destroyed. If the environment is not properly setup the test will fail.&lt;/li&gt;
	&lt;li&gt;Completely removing the dependency of MTAB registry on executor/network is not trivial as it would require to refactor a number of method to remove executor usage and move it elsewhere (most likely in tenant_migration_access_blocker_util.cpp).&lt;/li&gt;
&lt;/ul&gt;
</comment>
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