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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-39860] Separate reporting of RSTL and PBWM locks metrics in serverStatus and currentOp</title>
                <link>https://jira.mongodb.org/browse/SERVER-39860</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The introduction of the RSTL lock has considerably changed the behavior the locks.Global section of serverStatus because the RSTL metrics are currently lumped in with global lock metrics. Diagnosability will be improved if these lock metrics are reported separately.&lt;/p&gt;

&lt;p&gt;In addition the inclusion of the PBWM metrics in the locks.Global section has hampered diagnosability in the past, so we should also separate those metrics out.&lt;/p&gt;

&lt;p&gt;Specific strawman proposal: introduce new locks.RSTL and locks.PBWM alongside locks.Global, which will now include only global lock metrics and not RSTL or PBWM metrics:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;As part of this work we should also verify that clients waiting on the RSTL and PBWM locks will be reported as queued in the globalLock.currentQueue section, as the reported queues are an important diagnostic metric.&lt;/p&gt;</description>
                <environment></environment>
        <key id="705766">SERVER-39860</key>
            <summary>Separate reporting of RSTL and PBWM locks metrics in serverStatus and currentOp</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Wed, 27 Feb 2019 15:24:00 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:30 +0000</updated>
                            <resolved>Wed, 15 May 2019 00:32:02 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="2288850" author="dianna.hohensee" created="Tue, 18 Jun 2019 18:43:05 +0000"  >&lt;p&gt;FYI, I changed &quot;ParallelBatchWriter&quot; lock name outputted in the lock sections of serverStatus and currentOp to &quot;ParallelBatchWriteMode&quot; in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41105&quot; title=&quot;Rename parallel batch writer &amp;#39;mutex&amp;#39; and &amp;#39;mode&amp;#39; to &amp;#39;lock&amp;#39; throughout the code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41105&quot;&gt;&lt;del&gt;SERVER-41105&lt;/del&gt;&lt;/a&gt; in v4.3.1, which will be backported to 4.2.0 shortly.&lt;/p&gt;</comment>
                            <comment id="2246732" author="xgen-internal-githook" created="Tue, 14 May 2019 22:14:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39860&quot; title=&quot;Separate reporting of RSTL and PBWM locks metrics in serverStatus and currentOp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39860&quot;&gt;&lt;del&gt;SERVER-39860&lt;/del&gt;&lt;/a&gt; Separate reporting of RSTL and PBWM locks metrics in serverStatus and currentOp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/09db7023065f42ccc39dd3309536726814379c86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/09db7023065f42ccc39dd3309536726814379c86&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2198598" author="brian.lane" created="Tue, 2 Apr 2019 01:04:16 +0000"  >&lt;p&gt;I set it as 4.1 required, but don&apos;t think it needs to be part of the epic. &lt;/p&gt;

&lt;p&gt;Someone outside of the flow control project work could pick this up in a future sprint.  &lt;/p&gt;

&lt;p&gt;-Brian&lt;/p&gt;
</comment>
                            <comment id="2198223" author="geert.bosch" created="Mon, 1 Apr 2019 19:21:59 +0000"  >&lt;p&gt;I don&apos;t see how this ticket is required for the repl set flow control project at all. It&apos;s also not the case that that project changes use of RSTL or PBWM. So, no, I don&apos;t think it makes sense to add it to the project.&lt;/p&gt;</comment>
                            <comment id="2164967" author="bruce.lucas@10gen.com" created="Wed, 27 Feb 2019 17:40:18 +0000"  >&lt;p&gt;Lock status in currentOp should also report global, RSTL, and PBWM separately for locks acquired and locks waiting. Not sure whether this falls out of preceding changes automatically or requires additional tweaks.&lt;/p&gt;</comment>
                            <comment id="2164817" author="judah.schvimer" created="Wed, 27 Feb 2019 16:09:23 +0000"  >&lt;p&gt;I will reassign to storage since they generally own the lock manager. If they would like us to do it and have suggestions on the best design, we could schedule it. No one on the repl team has knowledge about lock reporting though, that I know of. I would like to make the solution general purpose enough so we can add future &quot;global locks&quot; without running into this issue again.&lt;/p&gt;</comment>
                    </comments>
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