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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-8622] serverStatus blocks waiting for various locks</title>
                <link>https://jira.mongodb.org/browse/SERVER-8622</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Here is a quick analysis of the locks hanging off serverStatus:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;b&gt;recordStats&lt;/b&gt; requires a read lock (Client::ReadContext) for each db&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;locks&lt;/b&gt; requires &quot;DBLocksMap::ref r(dblocks);&quot; (not write lock related)&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;cursors&lt;/b&gt; requires client cursor lock&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;network&lt;/b&gt; requires local lock for network counters&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;repl&lt;/b&gt; requires lock on &quot;ReplSetImpl&quot;
	&lt;ul&gt;
		&lt;li&gt;master/slave: local db, and possibly queries all replication sources (other server oplog entries &amp;#8211; first/last entry).&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The biggest issue is the recordStats since that requires a read lock for each db.&lt;/p&gt;</description>
                <environment></environment>
        <key id="65786">SERVER-8622</key>
            <summary>serverStatus blocks waiting for various locks</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="9">Done</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Feb 2013 22:50:16 +0000</created>
                <updated>Tue, 6 Dec 2022 05:24:21 +0000</updated>
                            <resolved>Thu, 23 Feb 2017 16:43:28 +0000</resolved>
                                    <version>2.4.0-rc0</version>
                                                    <component>Admin</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1507254" author="milkie" created="Thu, 23 Feb 2017 16:43:28 +0000"  >&lt;p&gt;There will always be locking necessary to glean the information needed by the various serverStatus sections.&lt;/p&gt;</comment>
                            <comment id="764295" author="scotthernandez" created="Fri, 14 Nov 2014 13:05:43 +0000"  >&lt;p&gt;In recent versions new sections also require new locking like storageEngine (wiredtiger) and rangeDelete, for example.&lt;/p&gt;</comment>
                            <comment id="271340" author="scotthernandez" created="Wed, 20 Feb 2013 18:32:08 +0000"  >&lt;p&gt;To work around this issue you can conditionally disable sections from being run/displayed like this:&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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.serverStatus({recordStats:0, locks:0}) &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// don&apos;t run or return the recordStats nor locks sections.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="169274">SERVER-16146</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="65794">DOCS-1142</issuekey>
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