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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-5139] sections on &quot;multithread replication&quot; and &quot;prefetching indexes&quot; can be updated for new storage engines</title>
                <link>https://jira.mongodb.org/browse/DOCS-5139</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;http://docs.mongodb.org/manual/core/replica-set-sync/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/replica-set-sync/&lt;/a&gt; a few sections can be updated for new storage engines.&lt;/p&gt;

&lt;p&gt;&amp;#8212;&lt;/p&gt;

&lt;p&gt;Is this true for all storage engines from the &quot;Multithreaded Replication&quot; section. If it is true then it limits my ability to have long running queries on a replica that isn&apos;t getting far behind on replication.&lt;/p&gt;

&lt;p&gt;&apos;While applying a batch, MongoDB blocks all reads. As a result, secondaries can never return data that reflects a state that never existed on the primary.&apos;&lt;/p&gt;

&lt;p&gt;&amp;#8212;&lt;/p&gt;

&lt;p&gt;The &quot;Prefetching Indexes&quot; section is only true for mmapv1, which is explained in the docs for the referenced parameter, secondaryIndexPrefetch, but I think the docs here could be updated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="193116">DOCS-5139</key>
            <summary>sections on &quot;multithread replication&quot; and &quot;prefetching indexes&quot; can be updated for new storage engines</summary>
                <type id="5" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14716&amp;avatarType=issuetype">Sub-task</type>
                            <parent id="185670">DOCS-4856</parent>
                                    <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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="mdcallag">Mark Callaghan</reporter>
                        <labels>
                            <label>storage</label>
                    </labels>
                <created>Tue, 31 Mar 2015 14:49:12 +0000</created>
                <updated>Wed, 11 Jan 2017 22:31:30 +0000</updated>
                            <resolved>Mon, 6 Jul 2015 18:50:03 +0000</resolved>
                                    <version>mongodb-3.0</version>
                                    <fixVersion>01112017-cleanup</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="958704" author="xgen-internal-githook" created="Mon, 6 Jul 2015 18:49:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5139&quot; title=&quot;sections on &amp;quot;multithread replication&amp;quot; and &amp;quot;prefetching indexes&amp;quot; can be updated for new storage engines&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5139&quot;&gt;&lt;del&gt;DOCS-5139&lt;/del&gt;&lt;/a&gt; update prefetch indexes and multithreaded replication&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/1ddc5e0567bdc1079fba285abceab1e08a5b6b73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/1ddc5e0567bdc1079fba285abceab1e08a5b6b73&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="869052" author="milkie" created="Tue, 31 Mar 2015 16:01:46 +0000"  >&lt;p&gt;&quot;Pre-Fetching Indexes to Improve Replication Throughput&quot; should be MMAPv1 only.&lt;/p&gt;

&lt;p&gt;The Multithreaded Replication section, in the 3.0 and master docs branches, can be changed to something like this:&lt;br/&gt;
----------------------------------&lt;br/&gt;
MongoDB applies write operations in batches using multiple threads to improve concurrency. MongoDB groups batches by namespace (MMAPv1) or by document id (WiredTiger) and simultaneously applies each group of operations using a different thread. MongoDB always applies write operations to a given document in their original write order.&lt;/p&gt;

&lt;p&gt;While applying a batch, MongoDB blocks all read operations. As a result, secondary read queries can never return data that reflect a state that never existed on the primary.&lt;/p&gt;</comment>
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