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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-28327] ClientCursorMonitor can timeout cursors prematurely</title>
                <link>https://jira.mongodb.org/browse/SERVER-28327</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ClientCursorMonitor will attempt to timeout cursors in a loop, sleeping 4 seconds between executions. On each execution it will capture the time delta between now and the start of the last execution. It increases each cursor&apos;s &quot;duration&quot; by this delta and then checks whether a cursor&apos;s cumulative delta is over 10 minutes, in which case it will be killed. So the definition of the delta is: timeout cursors execution time + 4 seconds. This is also our margin for error in cursor timeout. A newly created cursor will have its duration incremented by 4 seconds regardless of how long it has been in existence. This means we will timeout cursors which have been alive for 9m 56s to 10m 4s under ideal circumstances.&lt;/p&gt;

&lt;p&gt;As part of the timeout mechanism, a collection IS lock is required for each collection with cursors to check. When there is lock contention it can push the increment-delta much higher, pushing out the bounds of when we will timeout. A 2 minute wait would then mean timeout between 7m 56s and 12m 4s. Under extreme circumstances (waiting on locks for 10+ minutes) this will mean timeout of all cursors, regardless of actual lifetime.  &lt;/p&gt;</description>
                <environment></environment>
        <key id="365113">SERVER-28327</key>
            <summary>ClientCursorMonitor can timeout cursors prematurely</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                            <label>bkp</label>
                    </labels>
                <created>Wed, 15 Mar 2017 19:32:41 +0000</created>
                <updated>Thu, 26 Apr 2018 15:56:17 +0000</updated>
                            <resolved>Wed, 3 May 2017 21:50:10 +0000</resolved>
                                                    <fixVersion>3.5.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1564015" author="xgen-internal-githook" created="Wed, 3 May 2017 21:45:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28327&quot; title=&quot;ClientCursorMonitor can timeout cursors prematurely&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28327&quot;&gt;&lt;del&gt;SERVER-28327&lt;/del&gt;&lt;/a&gt; Revamp cursor timeout logic.&lt;/p&gt;

&lt;p&gt;Instead of tracking the number of idle milliseconds, each ClientCursor&lt;br/&gt;
tracks its last time of use. This also resolves related issues&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28328&quot; title=&quot;ClientCursor::_idleAgeMillis update is racy&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28328&quot;&gt;&lt;del&gt;SERVER-28328&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19892&quot; title=&quot;Cursor idle time should be calculated based on time that results were returned, instead of time that request was made&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19892&quot;&gt;&lt;del&gt;SERVER-19892&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7759c61a35f835aa109131b8f1575f0e1879cba0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7759c61a35f835aa109131b8f1575f0e1879cba0&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="318819">SERVER-26321</issuekey>
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            <issuekey id="376967">SERVER-28942</issuekey>
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