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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-18307] Increased lock time</title>
                <link>https://jira.mongodb.org/browse/SERVER-18307</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After upgrade from 2.6.8 to 2.6.9 our monitoring system detected increased lock time for almost all databases. Attaching graph for one of them (upgrade was done on 06.04). While this did not create any real problems yet, all of our databases exhibited this lock time growth and I wonder if it&apos;s a real change or maybe it&apos;s just an adjustment in lock time calculations/reporting?&lt;/p&gt;</description>
                <environment></environment>
        <key id="201753">SERVER-18307</key>
            <summary>Increased lock time</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="onyxmaster">Aristarkh Zagorodnikov</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 May 2015 10:17:38 +0000</created>
                <updated>Tue, 5 May 2015 14:51:43 +0000</updated>
                            <resolved>Tue, 5 May 2015 14:51:43 +0000</resolved>
                                    <version>2.6.9</version>
                                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="905344" author="onyxmaster" created="Tue, 5 May 2015 14:31:45 +0000"  >&lt;p&gt;Thank you, for your reply. It appears that &lt;span class=&quot;error&quot;&gt;&amp;#91;election&amp;#93;&lt;/span&gt; priorities were updated as a part of the upgrade process, which resulted in primary being moved to another server (the one in question). Please excuse me for the false alert and thank you again.&lt;/p&gt;</comment>
                            <comment id="904866" author="samk" created="Mon, 4 May 2015 23:45:39 +0000"  >&lt;p&gt;Hi, &lt;/p&gt;

&lt;p&gt;Looking over the changes in 2.6.9, nothing would obviously explain the effect that you&apos;re witnessing; however, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14071&quot; title=&quot;For queries with .sort(), bad non-blocking plan can be cached if there are zero results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14071&quot;&gt;&lt;del&gt;SERVER-14071&lt;/del&gt;&lt;/a&gt; could potentially explain an effect like this. aThe complete list of changes in 2.6.9 is &lt;a href=&quot;https://jira.mongodb.org/issues/?jql=fixVersion%20%3D%20%222.6.9%22%20AND%20project%20%3D%20SERVER&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;If &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14071&quot; title=&quot;For queries with .sort(), bad non-blocking plan can be cached if there are zero results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14071&quot;&gt;&lt;del&gt;SERVER-14071&lt;/del&gt;&lt;/a&gt; doesn&apos;t seem to be at play and if nothing jumps out at you from the changelog, the following questions will help us begin to investigate this issue: &lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Did the other members of the replica set change their syncing targets concurrently with the upgrade?&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Were there other configuration or application changes that might have corresponded with the upgrade or would have been related to restarting the set member?&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Did any of the other members of the replica set experience the same change following the upgade or was it limited to this instance?&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Have you investigated the logs? If you have logs where a system is experiencing higher-than-usual lock time, potentially with log-level 1 enabled, that might help us spot anomalies. You can attach those logs to this ticket.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Regards,&lt;br/&gt;
sam&lt;/p&gt;</comment>
                            <comment id="904079" author="onyxmaster" created="Mon, 4 May 2015 10:19:25 +0000"  >&lt;p&gt;P.S. The second lock time growth is a result of the node becoming primary, it was secondary at the time of upgrade.&lt;/p&gt;</comment>
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