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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-20438] Oplog performance on primary: efficiency of uncommitedRecordIds</title>
                <link>https://jira.mongodb.org/browse/SERVER-20438</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;32 threads insert, 24 CPU box.&lt;br/&gt;
standalone: 1.15M insert/s&lt;br/&gt;
with oplog: 186K insert/s&lt;/p&gt;

&lt;p&gt;Believed to be single threading in logOp from OplogHack mutex.&lt;br/&gt;
Contention from delete holding mutex whilst walking DLL is linear with list size.&lt;br/&gt;
Proposed fix of O(1) delete by retaining pointer handle to reference back&lt;/p&gt;</description>
                <environment></environment>
        <key id="230079">SERVER-20438</key>
            <summary>Oplog performance on primary: efficiency of uncommitedRecordIds</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="9">Done</resolution>
                                        <assignee username="greg.mckeon@mongodb.com">Gregory McKeon</assignee>
                                    <reporter username="martin.bligh">Martin Bligh</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Sep 2015 16:55:06 +0000</created>
                <updated>Thu, 2 Aug 2018 21:26:02 +0000</updated>
                            <resolved>Tue, 6 Oct 2015 16:43:03 +0000</resolved>
                                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1043282" author="xgen-internal-githook" created="Fri, 25 Sep 2015 13:16:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;martinbligh&apos;, u&apos;name&apos;: u&apos;Martin Bligh&apos;, u&apos;email&apos;: u&apos;mbligh@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20438&quot; title=&quot;Oplog performance on primary: efficiency of uncommitedRecordIds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20438&quot;&gt;&lt;del&gt;SERVER-20438&lt;/del&gt;&lt;/a&gt;: logOp refactor prior to vectorizing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0c001db908b6811c0e665e15150d1d30c47b8b5c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0c001db908b6811c0e665e15150d1d30c47b8b5c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1041048" author="xgen-internal-githook" created="Wed, 23 Sep 2015 17:03:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;martinbligh&apos;, u&apos;name&apos;: u&apos;Martin Bligh&apos;, u&apos;email&apos;: u&apos;mbligh@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20438&quot; title=&quot;Oplog performance on primary: efficiency of uncommitedRecordIds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20438&quot;&gt;&lt;del&gt;SERVER-20438&lt;/del&gt;&lt;/a&gt;: Stash pointer to _uncommittedRecordIds to get O(1) delete&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/92e38e66a79d8fc374c6c8f8faa6244f94144904&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/92e38e66a79d8fc374c6c8f8faa6244f94144904&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1039021" author="xgen-internal-githook" created="Mon, 21 Sep 2015 21:47:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;martinbligh&apos;, u&apos;name&apos;: u&apos;Martin Bligh&apos;, u&apos;email&apos;: u&apos;mbligh@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20438&quot; title=&quot;Oplog performance on primary: efficiency of uncommitedRecordIds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20438&quot;&gt;&lt;del&gt;SERVER-20438&lt;/del&gt;&lt;/a&gt;: only update oplogHack once per vectored insert&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c101632305f47619cd8f75429fe19621b36b727b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c101632305f47619cd8f75429fe19621b36b727b&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="384745">SERVER-29274</issuekey>
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