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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-29210] Create a thread in MongoDB to manage WiredTiger checkpoints</title>
                <link>https://jira.mongodb.org/browse/SERVER-29210</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At the moment MongoDB utilises a utility thread inside WiredTiger to create checkpoints. The thread is configured with:&lt;br/&gt;
&lt;tt&gt;&quot;checkpoint=(wait=60,log_size=2GB)&quot;;&lt;/tt&gt; where the 60 corresponds to &lt;tt&gt;storage.syncPeriodSecs&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;The goal of this work is to stop using the WiredTiger managed checkpoint thread, and instead manage checkpoint creation in MongoDB. The work needs to consider:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;If there are configurations that don&apos;t create checkpoints&lt;/li&gt;
	&lt;li&gt;If it is necessary to continue using the volume of log (journal) data as a trigger for checkpoints&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="383629">SERVER-29210</key>
            <summary>Create a thread in MongoDB to manage WiredTiger checkpoints</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="13201">Fixed</resolution>
                                        <assignee username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="alexander.gorrod@mongodb.com">Alexander Gorrod</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 May 2017 17:50:55 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:48 +0000</updated>
                            <resolved>Thu, 1 Jun 2017 15:35:11 +0000</resolved>
                                                    <fixVersion>3.5.9</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1584943" author="xgen-internal-githook" created="Thu, 1 Jun 2017 15:34:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dgottlieb&apos;, u&apos;name&apos;: u&apos;Daniel Gottlieb&apos;, u&apos;email&apos;: u&apos;daniel.gottlieb@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29210&quot; title=&quot;Create a thread in MongoDB to manage WiredTiger checkpoints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29210&quot;&gt;&lt;del&gt;SERVER-29210&lt;/del&gt;&lt;/a&gt;: Manage WiredTiger checkpoints in MongoDB.&lt;/p&gt;

&lt;p&gt;Prior to this change, WiredTiger would be started with a configuration that&lt;br/&gt;
instructs WiredTiger to start its own checkpoint thread. The parameters&lt;br/&gt;
would trigger a checkpoint every 60 seconds or 2GB of data written to the&lt;br/&gt;
journal. This patch disables WiredTiger&apos;s checkpoint thread and moves the&lt;br/&gt;
responsibility to MongoDB.&lt;/p&gt;

&lt;p&gt;The checkpoint thread now only checkpoints every 60 seconds (still&lt;br/&gt;
configurable with `--syncdelay`). The trigger on the amount of data written&lt;br/&gt;
to the journal was removed as an unnecessary mechanism to maintain parity&lt;br/&gt;
with.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cd2e5f07df13612b68deea94b82b001fca119373&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cd2e5f07df13612b68deea94b82b001fca119373&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1574574" author="sue.loverso" created="Thu, 18 May 2017 15:31:24 +0000"  >&lt;p&gt;It will not be easy to measure the volume of data written to the WT log files.  It could be approximated with a log cursor setting a cursor key to the first record of a log file and calling search to see if the record is found or not, knowing about how much data ends up in a log file and multiplying out.  However, we should be logging a lot less anyway so that rate would have to be scaled back if used.  Another (cleaner IMO) way to get a more accurate measurement would be to use a statistics cursor and look at the log bytes written periodically.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="398994">SERVER-29900</issuekey>
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            <issuelink>
            <issuekey id="383649">SERVER-29212</issuekey>
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