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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>[DOCS-14391] Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0</title>
                <link>https://jira.mongodb.org/browse/DOCS-14391</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Added server parameter replWriterMinThreadCount - The minimum number of threads in the thread pool used to apply the oplog with default 0. Secondary oplog application will use up to replWriterThreadCount threads (&lt;a href=&quot;https://docs.mongodb.com/manual/reference/parameters/#mongodb-parameter-param.replWriterThreadCount&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/parameters/#mongodb-parameter-param.replWriterThreadCount&lt;/a&gt;). If the newly added replWriterMinThreadCount is less than replWriterThreadCount, the thread pool will timeout idle threads and only keep replWriterMinThreadCount idle threads in the pool. (replWriterMinThreadCount must be less than or equal to replWriterThreadCount)&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54805&quot; title=&quot;Mongo become unresponsive, Spike in Connections and FD&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54805&quot;&gt;&lt;del&gt;SERVER-54805&lt;/del&gt;&lt;/a&gt; describes a case where the replication machinery on replica set secondaries ceases to make progress, with the symptom being that all threads in the replication writer thread pool are idle and the thread driving secondary replication is simultaneously blocked waiting for those writer threads to finish their work.&lt;/p&gt;

&lt;p&gt;So far, this behavior has only manifest on systems with glibc versions susceptible to &lt;a href=&quot;https://sourceware.org/bugzilla/show_bug.cgi?id=25847&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this glibc pthread condition variable bug&lt;/a&gt;. While I have not been able to build a minimal reproduction using our &lt;tt&gt;ThreadPool&lt;/tt&gt; type, the scenario proven to exist in &lt;a href=&quot;https://probablydance.com/2020/10/31/using-tla-in-the-real-world-to-understand-a-glibc-bug/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this blog post about using TLA+ to model glibc condition variables&lt;/a&gt; is perfectly analogous to how replication uses thread pools. In this scenario, a signal delivery that is lost due to the glibc bug leads to incomplete work being left in the thread pool, and no threads waking up to perform the work.&lt;/p&gt;

&lt;p&gt;Fortunately, a low-risk workaround for this bug as it manifests in the replication system&apos;s use of ThreadPool exists. By setting &lt;tt&gt;minThreads&lt;/tt&gt; to 0 instead of its current value, which is equal to &lt;tt&gt;maxThreads&lt;/tt&gt;, we ensure that all waits performed by worker threads eventually wake up due to expiration of the idle thread timeout.&lt;/p&gt;

&lt;p&gt;The task in this ticket is to change the value of &lt;tt&gt;minThreads&lt;/tt&gt; in the writer thread pool used by replication to 0. This will not eliminate all possible failures due to the glibc bug, but it will eliminate the only one we&apos;ve seen in practice until such time as the bug in glibc is corrected.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1695299">DOCS-14391</key>
            <summary>Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="andrew.feierabend@mongodb.com">Andrew Feierabend</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Apr 2021 01:52:25 +0000</created>
                <updated>Mon, 13 Nov 2023 17:55:29 +0000</updated>
                            <resolved>Mon, 14 Jun 2021 17:26:32 +0000</resolved>
                                                    <fixVersion>4.2.15</fixVersion>
                    <fixVersion>4.4.7</fixVersion>
                    <fixVersion>5.0.0-rc0</fixVersion>
                    <fixVersion>4.0.26</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 11 Jun 2021 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4010761" author="xgen-internal-githook" created="Thu, 19 Aug 2021 19:03:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; add replWriterMinThreadCount param&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/63d93cbd28f6fa31c75d7e50faafa105dcf8ecd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/63d93cbd28f6fa31c75d7e50faafa105dcf8ecd1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3960818" author="xgen-internal-githook" created="Fri, 23 Jul 2021 20:21:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; add replWriterMinThreadCount param&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/46b6ed8dd603becbeb2b1fc0bfb34167e5daedd7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/46b6ed8dd603becbeb2b1fc0bfb34167e5daedd7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3947991" author="xgen-internal-githook" created="Fri, 16 Jul 2021 21:00:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;55111344+andf-mongodb@users.noreply.github.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; Fix added version for v4.4.7&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0ec3922ee509fa71d522614ad9059c42f1a6cec5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0ec3922ee509fa71d522614ad9059c42f1a6cec5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3947990" author="xgen-internal-githook" created="Fri, 16 Jul 2021 21:00:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; add replWriterMinThreadCount param&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c8e2a91ff4530648fc43ae919de8c374ff010818&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c8e2a91ff4530648fc43ae919de8c374ff010818&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3876532" author="xgen-internal-githook" created="Mon, 14 Jun 2021 17:24:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;55111344+andf-mongodb@users.noreply.github.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; Fix added version for v4.4.7&lt;br/&gt;
Branch: v4.4.7&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0f7bae20df8530e2a70e69aac4db53b25ba85d16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0f7bae20df8530e2a70e69aac4db53b25ba85d16&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3876529" author="xgen-internal-githook" created="Mon, 14 Jun 2021 17:22:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; add replWriterMinThreadCount param&lt;br/&gt;
Branch: v4.2.15&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/274a75b5e04ab6e907e41424c9a446d80606d5b2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/274a75b5e04ab6e907e41424c9a446d80606d5b2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3876511" author="xgen-internal-githook" created="Mon, 14 Jun 2021 17:17:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; add replWriterMinThreadCount param&lt;br/&gt;
Branch: v4.4.7&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/63f1d33559a0136e0237c15580ffd8c397c6cfb3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/63f1d33559a0136e0237c15580ffd8c397c6cfb3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3876479" author="xgen-internal-githook" created="Mon, 14 Jun 2021 17:06:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;andf-mongodb&apos;, &apos;email&apos;: &apos;andrew.feierabend@mongodb.com&apos;, &apos;username&apos;: &apos;andf-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-14391&quot; title=&quot;Investigate changes in SERVER-56054: Change minThreads value for replication writer thread pool to 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-14391&quot;&gt;&lt;del&gt;DOCS-14391&lt;/del&gt;&lt;/a&gt; add replWriterMinThreadCount param&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b28a119ec97f523be8a5468d469fed522da6efad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b28a119ec97f523be8a5468d469fed522da6efad&lt;/a&gt;&lt;/p&gt;</comment>
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