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    <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-79607] ShardRegistry shutdown should not wait indefinitely on outstanding network requests</title>
                <link>https://jira.mongodb.org/browse/SERVER-79607</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a detailed description in the last comment of the BF linked.&lt;/p&gt;

&lt;p&gt;Summary:&lt;/p&gt;

&lt;p&gt;When we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37d84072b5c5b9fd723db5fa133fb202ad2317f1/src/mongo/s/client/shard_registry.cpp#L262-L272&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shutdown the shard registry&lt;/a&gt;, we shut down and join the thread pool used by the shard registry. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/37d84072b5c5b9fd723db5fa133fb202ad2317f1/src/mongo/util/concurrency/thread_pool.cpp#L262-L275&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Shutting down the thread pool&lt;/a&gt; just changes the state to be joinRequired. This stops any new tasks from being scheduled, but requires the join to still wait for all ongoing tasks to complete without interrupting them. In the case shown in the BF, one of the outgoing requests never finished, thus causing the join to stall.&lt;/p&gt;

&lt;p&gt;Some options to fix this:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Shut down the shard registry after we interrupt ongoing operations, rather than before. This way we would know that there are no ongoing operations that need waiting for when we call join. I am not sure what other implications moving this shutdown may have, though.&lt;/li&gt;
	&lt;li&gt;Interrupt ongoing lookups during shard registry shutdown. This would likely imply keeping cancellation tokens so that operations can be interrupted during shutdown.&lt;/li&gt;
	&lt;li&gt;Add a timeout to the network calls done by the shard registry. This solution, though, could cause shard registry refresh failures during times other than shutdown.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2407045">SERVER-79607</key>
            <summary>ShardRegistry shutdown should not wait indefinitely on outstanding network requests</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="13201">Fixed</resolution>
                                        <assignee username="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="allison.easton@mongodb.com">Allison Easton</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Aug 2023 13:01:47 +0000</created>
                <updated>Sun, 29 Oct 2023 21:18:06 +0000</updated>
                            <resolved>Mon, 14 Aug 2023 09:37:54 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.1</fixVersion>
                    <fixVersion>6.0.10</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5650264" author="xgen-internal-githook" created="Tue, 22 Aug 2023 14:11:56 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79607&quot; title=&quot;ShardRegistry shutdown should not wait indefinitely on outstanding network requests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79607&quot;&gt;&lt;del&gt;SERVER-79607&lt;/del&gt;&lt;/a&gt; ShardRegistry shutdown should not wait indefinitely on outstanding network requests&lt;/p&gt;

&lt;p&gt;(cherry picked from commit cce7e48a789e973cb647639f4d482d64c1c87b23)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ead4217e9f9e4e56cf30b022bc14633cafd25fcb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ead4217e9f9e4e56cf30b022bc14633cafd25fcb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5649461" author="xgen-internal-githook" created="Tue, 22 Aug 2023 10:17:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79607&quot; title=&quot;ShardRegistry shutdown should not wait indefinitely on outstanding network requests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79607&quot;&gt;&lt;del&gt;SERVER-79607&lt;/del&gt;&lt;/a&gt; ShardRegistry shutdown should not wait indefinitely on outstanding network requests&lt;/p&gt;

&lt;p&gt;(cherry picked from commit cce7e48a789e973cb647639f4d482d64c1c87b23)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/88ff3f397de2c151e4c5cc31f802cc7df1587b8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/88ff3f397de2c151e4c5cc31f802cc7df1587b8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5631604" author="xgen-internal-githook" created="Mon, 14 Aug 2023 09:37:01 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79607&quot; title=&quot;ShardRegistry shutdown should not wait indefinitely on outstanding network requests&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79607&quot;&gt;&lt;del&gt;SERVER-79607&lt;/del&gt;&lt;/a&gt; ShardRegistry shutdown should not wait indefinitely on outstanding network requests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cce7e48a789e973cb647639f4d482d64c1c87b23&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cce7e48a789e973cb647639f4d482d64c1c87b23&lt;/a&gt;&lt;/p&gt;</comment>
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