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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-30883] Fast-path caching of oldest oplog entry</title>
                <link>https://jira.mongodb.org/browse/SERVER-30883</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When the &lt;tt&gt;serverStatus&lt;/tt&gt; command is invoked, its &lt;tt&gt;oplog&lt;/tt&gt; section collects the most recent applied optime and retrieves the first entry from the oplog collection. Because the oldest op is less likely to be present in the WT cache, this may require us to read from disk, and possibly to wait for space during periods of high cache pressure.&lt;/p&gt;

&lt;p&gt;Given the frequency with which &lt;tt&gt;serverStatus&lt;/tt&gt; is called for FTDC collection and by the Monitoring Agent, we should consider implementing a separate caching mechanism and fast-path this query to avoid I/O and WT cache contention.&lt;/p&gt;</description>
                <environment></environment>
        <key id="421674">SERVER-30883</key>
            <summary>Fast-path caching of oldest oplog entry</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Aug 2017 01:49:21 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:56 +0000</updated>
                            <resolved>Wed, 12 Feb 2020 18:23:02 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Replication</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="2874561" author="xgen-internal-githook" created="Wed, 12 Feb 2020 18:20:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;milkie&apos;, &apos;name&apos;: &apos;Eric Milkie&apos;, &apos;email&apos;: &apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30883&quot; title=&quot;Fast-path caching of oldest oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30883&quot;&gt;&lt;del&gt;SERVER-30883&lt;/del&gt;&lt;/a&gt; fast-path fetching of oldest oplog entry&lt;/p&gt;

&lt;p&gt;This reverts commit b81a373933e8481fa40f4b6fc692e537df2e307b.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e561492b2547bc8247692731f0682da499bacc8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e561492b2547bc8247692731f0682da499bacc8f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2714180" author="xgen-internal-githook" created="Thu, 9 Jan 2020 13:47:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Milkie&apos;, &apos;email&apos;: &apos;milkie@mongodb.com&apos;, &apos;username&apos;: &apos;milkie&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30883&quot; title=&quot;Fast-path caching of oldest oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30883&quot;&gt;&lt;del&gt;SERVER-30883&lt;/del&gt;&lt;/a&gt; fast-path fetching of oldest oplog entry&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit ece14c8410785b6d1f37a221307b1a0f1ca4e82d.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b81a373933e8481fa40f4b6fc692e537df2e307b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b81a373933e8481fa40f4b6fc692e537df2e307b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2712614" author="xgen-internal-githook" created="Wed, 8 Jan 2020 19:09:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Milkie&apos;, &apos;email&apos;: &apos;milkie@mongodb.com&apos;, &apos;username&apos;: &apos;milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30883&quot; title=&quot;Fast-path caching of oldest oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30883&quot;&gt;&lt;del&gt;SERVER-30883&lt;/del&gt;&lt;/a&gt; fast-path fetching of oldest oplog entry&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ece14c8410785b6d1f37a221307b1a0f1ca4e82d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ece14c8410785b6d1f37a221307b1a0f1ca4e82d&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1296901">SERVER-47179</issuekey>
        </issuelink>
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