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    <title>MongoDB Jira</title>
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    <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-20709] mongoD runs out of connections very quickly, then becomes wedged</title>
                <link>https://jira.mongodb.org/browse/SERVER-20709</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a large sharded cluster where occasionally a secondary will become very slow and requires a restart to fix. All our reads go to secondaries. When inspecting the log of the secondary, I see that over the course of a couple seconds the number of connections goes up by many thousands. Then it will be filled with slow queries (taking over 100ms), which looks like every query hitting the replica. In normal operation these queries only take a few ms. After that I see lots of this sprinkled between the slow queries:&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;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;   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;[conn233831] killcursors  keyUpdates:0 writeConflicts:0 numYields:0 locks:{ Global: { acquireCount: { r: 2 }, acquireWaitCount: { r: 1 }, timeAcquiringMicros: { r: 52009 } }, Database: { acquireCount: { r: 1 } }, Collection: {&lt;/span&gt;&lt;/pre&gt;
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						&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-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;acquireCount: { r: 1 } } } 83ms&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Putting the replica into maintenance mode (sometimes for many hours) and then putting it back into service does not fix the issue. After putting back into service, the node still continues to serve very slowly. Restarting the mongoD process however does fix the problem. We have experienced this in version 3.0.5 and 3.0.6, with both mmapv1 and wiredTiger storage engines.&lt;/p&gt;</description>
                <environment></environment>
        <key id="232267">SERVER-20709</key>
            <summary>mongoD runs out of connections very quickly, then becomes wedged</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="-1">Unassigned</assignee>
                                    <reporter username="dai@foursquare.com">Dai Shi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Sep 2015 21:52:22 +0000</created>
                <updated>Fri, 2 Oct 2015 15:10:48 +0000</updated>
                            <resolved>Fri, 2 Oct 2015 15:10:48 +0000</resolved>
                                    <version>3.0.5</version>
                    <version>3.0.6</version>
                                                    <component>Admin</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1049887" author="ramon.fernandez" created="Fri, 2 Oct 2015 15:10:24 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dai%40foursquare.com&quot; class=&quot;user-hover&quot; rel=&quot;dai@foursquare.com&quot;&gt;dai@foursquare.com&lt;/a&gt;. Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;. See also our &lt;a href=&quot;https://www.mongodb.org/about/support/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Support page&lt;/a&gt; for additional support resources.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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