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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-50452] Make destruction of ServiceExecutorFixed deterministic</title>
                <link>https://jira.mongodb.org/browse/SERVER-50452</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;ServiceExecutorFixed&lt;/tt&gt; associates each executor thread with an instance of &lt;tt&gt;ExecutorThreadContext&lt;/tt&gt;&#160;(defined &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4f3f3a43ec61ef103ce4503e1de78e8906cab805/src/mongo/transport/service_executor_fixed.h#L81-L117&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;), which enables executor threads to keep track of the recursion depth and maintain the number of running executor threads. Each instance of &lt;tt&gt;ExecutorThreadContext&lt;/tt&gt;&#160;has a weak-ptr to its corresponding service executor, which is promoted to a shared-ptr at the time of initialization and termination of the executor thread (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4f3f3a43ec61ef103ce4503e1de78e8906cab805/src/mongo/transport/service_executor_fixed.h#L109-L113&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;As a result, executor threads could reference the corresponding service executor at times (through the aforementioned shared-ptr), which complicates reasoning about the destruction time of the service executor object. This is especially problematic in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5e03a3a6760248454c3d17a7275b6d2eba25bf78/src/mongo/transport/service_executor_test.cpp#L223-L226&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test&lt;/a&gt;, which relies on the destruction of the service executor object before leaving the test.&lt;/p&gt;

&lt;p&gt;This ticket should provide the means to enforce/ensure destruction of the service executor object, at least in the context of unit-tests. A possible solution is introducing a failpoint that blocks the caller until the last executor thread returns.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1448935">SERVER-50452</key>
            <summary>Make destruction of ServiceExecutorFixed deterministic</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="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Fri, 21 Aug 2020 16:29:43 +0000</created>
                <updated>Sun, 29 Oct 2023 22:04:10 +0000</updated>
                            <resolved>Sat, 12 Sep 2020 16:35:20 +0000</resolved>
                                                    <fixVersion>4.8.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3462055" author="xgen-internal-githook" created="Fri, 23 Oct 2020 21:57:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50452&quot; title=&quot;Make destruction of ServiceExecutorFixed deterministic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50452&quot;&gt;&lt;del&gt;SERVER-50452&lt;/del&gt;&lt;/a&gt; Make destruction of ServiceExecutorFixed deterministic&lt;/p&gt;

&lt;p&gt;This commit introduces new fail-points to allow unit-tests&lt;br/&gt;
deterministically examine creation and return of executor threads.&lt;br/&gt;
Branch: fixed_thread_pool_handshaking&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8cff99b2c4710a0e8abb7a0631d24385092697b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8cff99b2c4710a0e8abb7a0631d24385092697b4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3391001" author="xgen-internal-githook" created="Sat, 12 Sep 2020 16:38:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50452&quot; title=&quot;Make destruction of ServiceExecutorFixed deterministic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50452&quot;&gt;&lt;del&gt;SERVER-50452&lt;/del&gt;&lt;/a&gt; Make destruction of ServiceExecutorFixed deterministic&lt;/p&gt;

&lt;p&gt;This commit introduces new fail-points to allow unit-tests&lt;br/&gt;
deterministically examine creation and return of executor threads.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/86bc3de7ead3c1229530d05b192ba8ee43d5132c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/86bc3de7ead3c1229530d05b192ba8ee43d5132c&lt;/a&gt;&lt;/p&gt;</comment>
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