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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-80140] Use the $currentOp to verify that fsyncLockWorker threads are waiting for the lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-80140</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;del&gt;Increase the amount to sleep before invoking the fsync (lock:true) command, such that the fsyncLockWorker threads are enqueued in the lock &#160;conflict queue before unpausing the coordinator.&lt;/del&gt;&lt;/p&gt;

&lt;p&gt;Use the $currentOp output to verify that fsyncLockWorker threads are waiting for the lock (enqueued in the conflict queue) before unpausing the coordinator.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2418783">SERVER-80140</key>
            <summary>Use the $currentOp to verify that fsyncLockWorker threads are waiting for the lock</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="nandini.bhartiya@mongodb.com">Nandini Bhartiya</assignee>
                                    <reporter username="nandini.bhartiya@mongodb.com">Nandini Bhartiya</reporter>
                        <labels>
                            <label>sharding-nyc-subteam1</label>
                    </labels>
                <created>Wed, 16 Aug 2023 13:08:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:29 +0000</updated>
                            <resolved>Fri, 1 Sep 2023 15:29:49 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>4.4.25</fixVersion>
                    <fixVersion>7.0.2</fixVersion>
                    <fixVersion>5.0.22</fixVersion>
                    <fixVersion>6.0.11</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5640512" author="xgen-internal-githook" created="Thu, 17 Aug 2023 14:26:28 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Nandini Bhartiya&apos;, &apos;email&apos;: &apos;nandini.bhartiya@mongodb.com&apos;, &apos;username&apos;: &apos;nandinibhartiyaMDB&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80140&quot; title=&quot;Use the $currentOp to verify that fsyncLockWorker threads are waiting for the lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80140&quot;&gt;&lt;del&gt;SERVER-80140&lt;/del&gt;&lt;/a&gt;: Use $currentOp to ensure fsyncLockWorker threads are in the conflict queue.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ce447db31ad61f18f45502e728b4ef4fc138b44f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ce447db31ad61f18f45502e728b4ef4fc138b44f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5638181" author="JIRAUSER1268284" created="Wed, 16 Aug 2023 16:21:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn@mongodb.com&quot;&gt;max.hirschhorn@mongodb.com&lt;/a&gt; mentioned to set idleConnections to false in the $currentOp query. The fsyncLockWorker threads are now visible in the $currentOp output.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.aggregate([{$currentOp: {allUsers: true, idleConnections: true}}]).toArray()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
                            <comment id="5637456" author="JIRAUSER1268284" created="Wed, 16 Aug 2023 13:27:14 +0000"  >&lt;p&gt;We experimented with checking the value for $currentOp, but the fsyncLockWorker thread did not show up in the output. We also tried to add a fail point in the concurrency code (so we know when the fsyncLockWorker threads are in the conflict queue) instead of using a sleep(), but were discouraged from doing so because of possible performance issues (&lt;a href=&quot;https://mongodb.slack.com/archives/CMLKU7Y1M/p1691015559887209&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;slack thread&lt;/a&gt;).&lt;/p&gt;</comment>
                            <comment id="5637434" author="max.hirschhorn@10gen.com" created="Wed, 16 Aug 2023 13:16:21 +0000"  >&lt;p&gt;Can we instead use $currentOp within an assert.soon() callback to explicitly wait on the fsyncLockWorker thread having enqueued the lock (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0488797375979ed7a60f096915d95f78b5bb765e/jstests/replsets/transactions_committed_with_tickets_exhausted.js#L77&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;for example&lt;/a&gt;)? Generally a sleep of a fixed number isn&apos;t a good synchronization tactic.&lt;/p&gt;</comment>
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