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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-60782] ThreadPool::waitForIdle should not be called concurrently with shutdown in TenantOplogApplier shutdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-60782</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;waitForIdle was ported from the old ThreadPool when the current one was written to serve the needs of a few highly-constrained callers. The current ThreadPool was not designed to have waitForIdle called concurrently with shutdown/a shutting-down thread pool; to use waitForIdle safely the threadPool must remain in an un-shut-down state from the time waitForIdle is called until the pool idles (and waitForIdle returns).&lt;/p&gt;

&lt;p&gt;We considered updating the ThreadPool to give waitForIdle a safe-contract with regards to concurrent shutdown, but it would require non-trivial changes to the ThreadPool bookeeping internals that are somewhat high-risk because of the widespread risk of the ThreadPool. Additionally, waitForIdle has only 3 non-test only users: the TenantOplogApplier, the old OplogApplierImpl, and the DeferredWriter, and we plan to deprecate the current waitForIdle API in favor of a barrier-based approach. So we&apos;ve decided not to change the ThreadPool internals and instead ensure all callers follow the above safety guarantee for waitForIdle.&lt;/p&gt;

&lt;p&gt;Currently, the TenantOplogApplier is the only piece of code that may call waitForIdle on a shutting-down or shut-down thread pool.&#160;This is unsafe and may lead to hangs. Instead, it would be better to follow the pattern in the old OplogApplierImpl, which joins any threads that may call waitForIdle before shutting down the thread pool, guaranteeing that waitForIdle cannot be called concurrently with shutdown or on a shut-down thread pool.&#160; This ticket tracks modifying TenantOplogApplier shutdown to use the safe pattern.&lt;/p&gt;

&lt;p&gt;(In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60444&quot; title=&quot;ThreadPool::waitForIdle&amp;#39;s header comment should note that it can&amp;#39;t be called concurrently with shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60444&quot;&gt;SERVER-60444&lt;/a&gt; SA will update the comments in the code around waitForIdle to document this safety guarantee; apologies for not doing so earlier and thanks for your help with this!)&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1901024">SERVER-60782</key>
            <summary>ThreadPool::waitForIdle should not be called concurrently with shutdown in TenantOplogApplier shutdown</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="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                    </labels>
                <created>Mon, 18 Oct 2021 15:39:43 +0000</created>
                <updated>Sun, 29 Oct 2023 21:47:15 +0000</updated>
                            <resolved>Mon, 25 Oct 2021 21:07:46 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.1.0-rc3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4161398" author="xgen-internal-githook" created="Mon, 1 Nov 2021 18:46:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60782&quot; title=&quot;ThreadPool::waitForIdle should not be called concurrently with shutdown in TenantOplogApplier shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60782&quot;&gt;&lt;del&gt;SERVER-60782&lt;/del&gt;&lt;/a&gt;: ThreadPool::waitForIdle should not be called concurrently with shutdown in TenantOplogApplier shutdown&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 90a82a5938e5655e283518feb29c92bdb490bb9d)&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c4686a8ae4ac666cc10d25484abe003ab21fb835&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c4686a8ae4ac666cc10d25484abe003ab21fb835&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4144505" author="xgen-internal-githook" created="Mon, 25 Oct 2021 04:39:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60782&quot; title=&quot;ThreadPool::waitForIdle should not be called concurrently with shutdown in TenantOplogApplier shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60782&quot;&gt;&lt;del&gt;SERVER-60782&lt;/del&gt;&lt;/a&gt;: ThreadPool::waitForIdle should not be called concurrently with shutdown in TenantOplogApplier shutdown&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/90a82a5938e5655e283518feb29c92bdb490bb9d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/90a82a5938e5655e283518feb29c92bdb490bb9d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4129728" author="george.wangensteen" created="Mon, 18 Oct 2021 15:40:11 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lingzhi.deng&quot; class=&quot;user-hover&quot; rel=&quot;lingzhi.deng&quot;&gt;lingzhi.deng&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;&#160;&lt;/p&gt;</comment>
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