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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-16737] support eviction_dirty_trigger for WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-16737</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Discussion started in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16665&quot; title=&quot;WiredTiger b-tree uses too much space in journal directory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16665&quot;&gt;&lt;del&gt;SERVER-16665&lt;/del&gt;&lt;/a&gt;. WT supports eviction_dirty_target, eviction_target and eviction_trigger. I also want a setting for eviction_dirty_trigger. With a 144G RAM server I don&apos;t want 140G of dirty pages in the WT cache but I need eviction_dirty_trigger and eviction_dirty_target to enforce that. Otherwise, the percentage of dirty data in the cache will approach 100% and if eviction_dirty_trigger is small then eviction might run for a very long time.&lt;/p&gt;</description>
                <environment></environment>
        <key id="177184">SERVER-16737</key>
            <summary>support eviction_dirty_trigger for WiredTiger</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="alexander.gorrod@mongodb.com">Alexander Gorrod</assignee>
                                    <reporter username="mdcallag">Mark Callaghan</reporter>
                        <labels>
                            <label>wiredtiger</label>
                    </labels>
                <created>Tue, 6 Jan 2015 16:36:24 +0000</created>
                <updated>Fri, 5 Feb 2016 14:29:36 +0000</updated>
                            <resolved>Fri, 26 Jun 2015 05:47:32 +0000</resolved>
                                                    <fixVersion>3.1.5</fixVersion>
                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="937010" author="xgen-internal-githook" created="Wed, 10 Jun 2015 21:44:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agorrod&apos;, u&apos;name&apos;: u&apos;Alex Gorrod&apos;, u&apos;email&apos;: u&apos;alexg@wiredtiger.com&apos;}
&lt;p&gt;Message: Add an eviction_dirty_trigger configuration setting.&lt;/p&gt;

&lt;p&gt;Allows applications to maintain a low proportion of dirty pages in&lt;br/&gt;
the cache, while allowing clean pages to utilize the cache.&lt;/p&gt;

&lt;p&gt;While here, alter the minimum allowed dirty trigger and target to&lt;br/&gt;
be set as low as 5 percent. Which may be desired for huge caches.&lt;/p&gt;

&lt;p&gt;refs &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16737&quot; title=&quot;support eviction_dirty_trigger for WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16737&quot;&gt;&lt;del&gt;SERVER-16737&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/WT-1350&quot; title=&quot;Flush dirty pages without evicting them&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-1350&quot;&gt;&lt;del&gt;WT-1350&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;e Please enter the commit message for your changes. Lines starting&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/e075e2c9444549e718a98a345fa967cc92c5da09&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/e075e2c9444549e718a98a345fa967cc92c5da09&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="936742" author="alexander.gorrod" created="Wed, 10 Jun 2015 18:30:15 +0000"  >&lt;p&gt;This isn&apos;t exposed via a documented MongoDB configuration setting, it is available via the general wiredTigerEngineConfigString setting.&lt;/p&gt;</comment>
                            <comment id="936736" author="alexander.gorrod" created="Wed, 10 Jun 2015 18:25:31 +0000"  >&lt;p&gt;Support for eviction_dirty_trigger has been added to WiredTiger in:&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/pull/1999&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/pull/1999&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Support is in the latest MongoDB master branch.&lt;/p&gt;</comment>
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