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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-62152] Investigate hang in unit tests when ShardRegistry reload on fixed executor</title>
                <link>https://jira.mongodb.org/browse/SERVER-62152</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f086caabba92a63a81403db4e139441d39a80451/src/mongo/s/client/shard_registry.cpp#L446-L459&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AsyncTry for reloading the ShardRegistry&lt;/a&gt; is causing hangs in some unit tests. As a temporary solution, it was needed to commit a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f086caabba92a63a81403db4e139441d39a80451/src/mongo/s/client/shard_registry.cpp#L441-L444&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;special case only for unit tests&lt;/a&gt; performing a synchronous reload.&lt;/p&gt;

&lt;p&gt;For example, by just keeping the async reload, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bc4a9b441a3526e9703f5da0e1fb250dda15d867/src/mongo/db/s/migration_destination_manager_test.cpp#L174&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MigrationDestinationManagerGetIndexesAndCollectionsNoVersionsOrReadConcern&lt;/a&gt; is hanging after logging this line:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;Attaching backtrace of the hang. The thread is stuck waiting on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5df159a364ec3a94d1e1ae01c70e3ca33cb10b4f/src/mongo/executor/network_interface_mock.cpp#L621&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this condition variable&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1953582">SERVER-62152</key>
            <summary>Investigate hang in unit tests when ShardRegistry reload on fixed executor</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Fri, 17 Dec 2021 16:52:07 +0000</created>
                <updated>Tue, 6 Dec 2022 00:42:58 +0000</updated>
                            <resolved>Thu, 3 Feb 2022 16:24:10 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4356966" author="xgen-internal-githook" created="Tue, 15 Feb 2022 19:02:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63270&quot; title=&quot;Complete TODO listed in SERVER-62152&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63270&quot;&gt;&lt;del&gt;SERVER-63270&lt;/del&gt;&lt;/a&gt; Complete TODO listed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62152&quot; title=&quot;Investigate hang in unit tests when ShardRegistry reload on fixed executor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62152&quot;&gt;&lt;del&gt;SERVER-62152&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c54aa67c44f81d3a1ea8fc3832c88eec41cda36b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c54aa67c44f81d3a1ea8fc3832c88eec41cda36b&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1976945">SERVER-63270</issuekey>
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                            <attachment id="351569" name="backtrace_hang.txt" size="5390" author="pierlauro.sciarelli@mongodb.com" created="Fri, 17 Dec 2021 19:46:47 +0000"/>
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