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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>[DOCS-13070] 4.2.1 Docs for SERVER-43322: Add tracking tools for measuring OplogStones performance</title>
                <link>https://jira.mongodb.org/browse/DOCS-13070</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    In this patch, we add the following server parameters: maxOplogTruncationPointsAfterStartup, maxOplogTruncationPointsDuringStartup, minOplogTruncationPoints, oplogTruncationPointSizeMB. &lt;/p&gt;

&lt;p&gt;We also add a section to serverStatus called &quot;oplogTruncation&quot;, with the fields totalTimeProcessingMicros, processingMethod, truncateCount, and totalTimeTruncatingMicros. The former two fields refer to the total time necessary to process (either by sampling or by scanning) the oplog on start up in order to determine oplog truncation points. The latter two fields refer to oplog truncation count and duration. &lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    In order to best educate a solution for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42175&quot; title=&quot;WiredTigerRecordStore::reclaimOplog can block for extended periods of time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42175&quot;&gt;&lt;del&gt;SERVER-42175&lt;/del&gt;&lt;/a&gt;, we should generate some data on start up and truncation performance with respect to different sizes of OplogStones.&lt;/p&gt;

&lt;p&gt;We should add server parameters for maximum counts of OplogStones and minimum sizes of OplogStones. Additionally, we should track:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;How long oplog sampling takes on start up&lt;/li&gt;
	&lt;li&gt;Average amount of time spent truncating&lt;/li&gt;
	&lt;li&gt;Cumulative length of time spent truncating&lt;/li&gt;
	&lt;li&gt;Cumulative amount of truncate calls&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;3. and 4. allow us to determine the average amount of time spent truncating.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;ul&gt;
	&lt;li&gt;4.2 - WT only&lt;/li&gt;
	&lt;li&gt;4.4 - WT and inMemory (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13130&quot; title=&quot;4.4 Docs for SERVER-43322: Add tracking tools for measuring OplogStones performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13130&quot;&gt;&lt;del&gt;DOCS-13130&lt;/del&gt;&lt;/a&gt;)&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="956775">DOCS-13070</key>
            <summary>4.2.1 Docs for SERVER-43322: Add tracking tools for measuring OplogStones performance</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Oct 2019 20:40:42 +0000</created>
                <updated>Mon, 13 Nov 2023 18:15:36 +0000</updated>
                            <resolved>Fri, 18 Oct 2019 18:50:27 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.1</fixVersion>
                    <fixVersion>4.0.14</fixVersion>
                    <fixVersion>3.6.16</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2644180" author="xgen-internal-githook" created="Wed, 18 Dec 2019 19:44:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13070&quot; title=&quot;4.2.1 Docs for SERVER-43322: Add tracking tools for measuring OplogStones performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13070&quot;&gt;&lt;del&gt;DOCS-13070&lt;/del&gt;&lt;/a&gt;: 4.0.14 oplog truncation metrics&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/18f998eb4c0e364b5fe59b2dbddd8bfc5d73d680&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/18f998eb4c0e364b5fe59b2dbddd8bfc5d73d680&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2639951" author="xgen-internal-githook" created="Wed, 18 Dec 2019 06:55:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13070&quot; title=&quot;4.2.1 Docs for SERVER-43322: Add tracking tools for measuring OplogStones performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13070&quot;&gt;&lt;del&gt;DOCS-13070&lt;/del&gt;&lt;/a&gt;: 3.6.16 oplog truncation metrics&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/62cfacfa1732945242f1ef74a7b2cb8d18bfda98&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/62cfacfa1732945242f1ef74a7b2cb8d18bfda98&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2639878" author="xgen-internal-githook" created="Wed, 18 Dec 2019 06:49:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13070&quot; title=&quot;4.2.1 Docs for SERVER-43322: Add tracking tools for measuring OplogStones performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13070&quot;&gt;&lt;del&gt;DOCS-13070&lt;/del&gt;&lt;/a&gt;: 4.0.14 oplog truncation metrics&lt;br/&gt;
Branch: v4.0.14&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8becd46b1cd8a7338c5ef990e638d040d807f05a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8becd46b1cd8a7338c5ef990e638d040d807f05a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2490321" author="xgen-internal-githook" created="Fri, 18 Oct 2019 18:10:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13070&quot; title=&quot;4.2.1 Docs for SERVER-43322: Add tracking tools for measuring OplogStones performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13070&quot;&gt;&lt;del&gt;DOCS-13070&lt;/del&gt;&lt;/a&gt;: 4.2.1 oplog truncation metrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ff30fdf12c7ba97d7ccd0c87be7595d3b5de4de1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ff30fdf12c7ba97d7ccd0c87be7595d3b5de4de1&lt;/a&gt;&lt;/p&gt;</comment>
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