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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-6718] option to disable index prefetching as part of multithreaded replication</title>
                <link>https://jira.mongodb.org/browse/SERVER-6718</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For certain workloads, index prefetching for replicated ops can hurt performance on secondaries.  &lt;/p&gt;</description>
                <environment></environment>
        <key id="46293">SERVER-6718</key>
            <summary>option to disable index prefetching as part of multithreaded replication</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Sun, 5 Aug 2012 17:33:03 +0000</created>
                <updated>Tue, 19 Mar 2013 16:25:54 +0000</updated>
                            <resolved>Wed, 8 Aug 2012 21:56:14 +0000</resolved>
                                    <version>2.2.0-rc0</version>
                                    <fixVersion>2.2.0-rc1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="151764" author="auto" created="Wed, 8 Aug 2012 21:47:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-08T14:46:48-07:00&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6718&quot; title=&quot;option to disable index prefetching as part of multithreaded replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6718&quot;&gt;&lt;del&gt;SERVER-6718&lt;/del&gt;&lt;/a&gt; initialize member variable to intended default&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e6f62bb3cd09822635bb9eb241041acd50aaed92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e6f62bb3cd09822635bb9eb241041acd50aaed92&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="151624" author="auto" created="Wed, 8 Aug 2012 16:22:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-08T08:32:39-07:00&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6718&quot; title=&quot;option to disable index prefetching as part of multithreaded replication&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6718&quot;&gt;&lt;del&gt;SERVER-6718&lt;/del&gt;&lt;/a&gt; new parameter to control replication index prefetching behavior&lt;/p&gt;

&lt;p&gt;New parameter replIndexPrefetch.&lt;br/&gt;
Settable via the command line or use setParameter() command on a running server.&lt;br/&gt;
Only valid on a server started with --replSet parameter.&lt;br/&gt;
This allows a user to disable the prefetching of all index pages prior to the application&lt;br/&gt;
of a replicated op on a secondary.&lt;br/&gt;
For most use cases, prefetching all indexes for a given op will provide good performance.&lt;br/&gt;
For use cases that do many in-place updates to documents in a collection with many indexes&lt;br/&gt;
that are unaffected by such updates, using the &apos;_id_only&apos; setting may provide better performance&lt;br/&gt;
than the &apos;all&apos; setting.  The &apos;_id_only&apos; setting only prefetches index pages for the _id index,&lt;br/&gt;
which will always be used to find the document needed to be updated.&lt;br/&gt;
The &apos;none&apos; setting will be used for debugging only; there should be no production use cases for&lt;br/&gt;
this setting.&lt;br/&gt;
getParameter() supports getting the current value of this parameter.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c7d800c733ecbfdde9e2594c11d1b25cd1e7ceeb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c7d800c733ecbfdde9e2594c11d1b25cd1e7ceeb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="151225" author="milkie" created="Tue, 7 Aug 2012 18:30:31 +0000"  >&lt;p&gt;Modified proposal:&lt;br/&gt;
Command line flag --replIndexPrefetch&lt;br/&gt;
Parameter replIndexPrefetch&lt;br/&gt;
values: none, _id_only, all&lt;br/&gt;
&quot;all&quot; is the default if unspecified.&lt;/p&gt;</comment>
                            <comment id="150749" author="milkie" created="Mon, 6 Aug 2012 15:19:58 +0000"  >&lt;p&gt;Proposal is to add another config option to the replica set config:&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;, indexPrefetch : &amp;lt;behavior&amp;gt; &amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;where &amp;lt;behavior&amp;gt; can be one of &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;off&amp;quot;,&amp;quot;_id&amp;quot;,&amp;quot;all&amp;quot;&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;&quot;off&quot; : no prefetching for indexes&lt;br/&gt;
&quot;&lt;em&gt;id&quot; : only the _id&lt;/em&gt; index will be prefetched&lt;br/&gt;
&quot;all&quot; (default) : every index will be prefetched&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="47484">DOCS-417</issuekey>
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