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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-21155] Only parse oplog entries once during replication (apply phase)</title>
                <link>https://jira.mongodb.org/browse/SERVER-21155</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once the oplog entries are fetches from the upstream source the same fields, &quot;ns&quot;, &quot;op&quot;, &quot;ts&quot; and others are repeatedly read from the same entry causing lots of extra parsing/work.&lt;/p&gt;

&lt;p&gt;One possible solution is to create a simple struct to wrap the BSONObj which caches the well-known fields:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;ts&lt;/li&gt;
	&lt;li&gt;ns&lt;/li&gt;
	&lt;li&gt;op&lt;/li&gt;
	&lt;li&gt;o (optional)&lt;/li&gt;
	&lt;li&gt;o2 (optional)&lt;/li&gt;
	&lt;li&gt;o/o2._id (optional)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="236300">SERVER-21155</key>
            <summary>Only parse oplog entries once during replication (apply phase)</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="9">Done</resolution>
                                        <assignee username="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Tue, 27 Oct 2015 11:55:27 +0000</created>
                <updated>Tue, 17 Nov 2015 18:34:22 +0000</updated>
                            <resolved>Fri, 13 Nov 2015 16:00:03 +0000</resolved>
                                                    <fixVersion>3.2.0-rc3</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1087893" author="scotthernandez" created="Fri, 13 Nov 2015 15:59:57 +0000"  >&lt;p&gt;The apply side of this has been done with other work.&lt;/p&gt;

&lt;p&gt;Still need to optimize on the network read side.&lt;/p&gt;</comment>
                            <comment id="1081961" author="xgen-internal-githook" created="Fri, 6 Nov 2015 17:58:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21154&quot; title=&quot;Prepare Apply Batches Outside of Applier Thread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21154&quot;&gt;&lt;del&gt;SERVER-21154&lt;/del&gt;&lt;/a&gt; Batch and parse oplog entries in parallel with applying them&lt;/p&gt;

&lt;p&gt;This includes the start of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21155&quot; title=&quot;Only parse oplog entries once during replication (apply phase)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21155&quot;&gt;&lt;del&gt;SERVER-21155&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6543f0dea026b6ff9ad6f701a8f6ca62f0679613&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6543f0dea026b6ff9ad6f701a8f6ca62f0679613&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1079659" author="xgen-internal-githook" created="Wed, 4 Nov 2015 19:22:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21154&quot; title=&quot;Prepare Apply Batches Outside of Applier Thread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21154&quot;&gt;&lt;del&gt;SERVER-21154&lt;/del&gt;&lt;/a&gt; Batch and parse oplog entries in parallel with applying them&lt;/p&gt;

&lt;p&gt;This includes the start of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21155&quot; title=&quot;Only parse oplog entries once during replication (apply phase)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21155&quot;&gt;&lt;del&gt;SERVER-21155&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2f70889bbfd4dea77cd26cec2dde28193b06905d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2f70889bbfd4dea77cd26cec2dde28193b06905d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="235971">SERVER-21107</issuekey>
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