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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>
    </build-info>


<item>
            <title>[SERVER-25119] Do not re-create the _id_ index during cloning</title>
                <link>https://jira.mongodb.org/browse/SERVER-25119</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In src/mongo/db/cloner.cpp:Cloner::copyDb&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;first time, copy data, create _id index to remove the dup _id items during initial sync.&lt;/li&gt;
	&lt;li&gt;second time, build index, remove all index, and then create&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;When sync source have _id index, the secondary can just keep the _id index created when copy data, no need to do it twice.&lt;/p&gt;</description>
                <environment></environment>
        <key id="301710">SERVER-25119</key>
            <summary>Do not re-create the _id_ index during cloning</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="zyd_com@126.com">Zhang Youdong</reporter>
                        <labels>
                            <label>cloner</label>
                            <label>copydb</label>
                            <label>initialSync</label>
                    </labels>
                <created>Sun, 17 Jul 2016 13:17:13 +0000</created>
                <updated>Mon, 15 Nov 2021 15:12:47 +0000</updated>
                            <resolved>Tue, 19 Jul 2016 21:25:54 +0000</resolved>
                                    <version>3.0.0</version>
                    <version>3.2.3</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1329230" author="zyd_com@126.com" created="Wed, 20 Jul 2016 01:00:30 +0000"  >&lt;p&gt;Thank you, &lt;a href=&quot;#Scott Hernandez&quot; target=&quot;_blank&quot; rel=&quot;noopener&quot;&gt;Scott Hernandez&lt;/a&gt;, I tested again, and found I misunderstand the source code and runtime log last time, sorry for inconvenience.&lt;/p&gt;

</comment>
                            <comment id="1329013" author="scotthernandez" created="Tue, 19 Jul 2016 21:25:54 +0000"  >&lt;p&gt;It turns out this was not an issue. I noticed my mistake after we started testing and it was more clear what was happening.&lt;/p&gt;

&lt;p&gt;This &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/cloner.cpp#L352&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;line&lt;/a&gt; :&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;indexer.removeExistingIndexes(&amp;amp;indexesToBuild);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/p&gt;

&lt;p&gt;This code doesn&apos;t remove the &amp;#95;id&amp;#95; index from the collection, but instead remove it from the list of indexes which will be created &amp;#8211; so it will not drop/create existing indexes.&lt;/p&gt;

&lt;p&gt;It is even a bit more confusing since when the collection is created we don&apos;t create the &amp;#95;id index in this call (last arg is false meaning don&apos;t create the &amp;#95;id&amp;#95; index): &lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Status status = userCreateNS(txn, db, ns, options, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;false&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;  &lt;/p&gt;</comment>
                            <comment id="1326326" author="scotthernandez" created="Sun, 17 Jul 2016 14:15:43 +0000"  >&lt;p&gt;Thanks for finding this performance issue. It does affect 3.2 and before, but since we re-wrote initial sync for 3.4 it is not longer an issue going forward. A back port will need to be worked on for pre-3.4 initial sync behavior.&lt;/p&gt;</comment>
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