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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-8616] Adding Tunable to TTL Collection thread</title>
                <link>https://jira.mongodb.org/browse/SERVER-8616</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be nice to be able to add a tunable to TTL Indexes to change the priority of the cleanup thread. &lt;/p&gt;

&lt;p&gt;For systems with High Loads, slightly higher priorities will prevent heavy backups of the cleanups. And lower access systems might require a lower priority than what it is set at.&lt;/p&gt;

&lt;p&gt;It is possible for heavy write loads to fall days behind in terms of your TTL cleanup and it is possible for the TTL to effect performance slightly. Being able to have more fine grained control of it depending on what you want would be great.&lt;/p&gt;</description>
                <environment></environment>
        <key id="65749">SERVER-8616</key>
            <summary>Adding Tunable to TTL Collection thread</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="osmar.olivo">Osmar Olivo</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Feb 2013 18:33:49 +0000</created>
                <updated>Tue, 6 Dec 2022 05:24:24 +0000</updated>
                            <resolved>Mon, 11 May 2020 18:49:04 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>14</votes>
                                    <watches>20</watches>
                                                                                                                <comments>
                            <comment id="3079288" author="connie.chen" created="Mon, 11 May 2020 18:50:32 +0000"  >&lt;p&gt;Recent improvements to TTL collection thread have increased efficiency in deletion and reduced the need for this control, so we are closing this as&#160;&lt;em&gt;Gone Away&lt;/em&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1025439" author="asya" created="Wed, 9 Sep 2015 17:40:01 +0000"  >&lt;p&gt;As a workaround, it is already currently possible to disable TTL thread temporarily with the following:&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;   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.adminCommand({setParameter:1, ttlMonitorEnabled:false});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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.adminCommand({setParameter:1, ttlMonitorEnabled:true});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The second line re-enables the TTL monitor thread.  If there is a high load period during which you want to prevent TTL from running, you can use these - however, when re-enabled, there will be a lot more documents to delete than &quot;normal&quot; (for all the time that TTL thread was not running).&lt;/p&gt;</comment>
                            <comment id="721658" author="rwander" created="Thu, 18 Sep 2014 07:22:39 +0000"  >&lt;p&gt;+1 vote for this issue&lt;/p&gt;</comment>
                            <comment id="417013" author="mediamath" created="Tue, 3 Sep 2013 19:22:13 +0000"  >
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;TTL monitor should have the same features as balancer so user can enable/disable and schedule window of operation&lt;/li&gt;
	&lt;li&gt;TTL should run in background with lower prioirty and cause minimal interference to actual db operations&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="407413" author="jdurante" created="Tue, 20 Aug 2013 16:17:22 +0000"  >&lt;p&gt;+1 This is a very important feature for High availability systems. Removing documents every minute could lead to a poor performance on cluster with high througput&lt;br/&gt;
I had this problem and I removed the index. Everything went back to normal. I&apos;m planning to do a nigthly job to remove old documents, but this is not the optimal solution&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="165309">SERVER-15800</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="12188">SERVER-1256</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="136373">SERVER-13937</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="46272">SERVER-6712</issuekey>
        </issuelink>
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