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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-12550] Restore some form of two step (phase) index key insertion</title>
                <link>https://jira.mongodb.org/browse/SERVER-12550</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;v2.4.x has two phase insertion of keys in indexes on inserts.  first it descends and finds insertion points in all indexes, then it goes and does the actual key insertions.  it was done this way so that as much reading as possible is done before doing a write, as once we mutate something, pagefaultexceptions are no longer possible.  i.e. imagine a collection with 10 indexes, after inserting a key in index 1 you can&apos;t then PFE on any remaining index lookups.&lt;/p&gt;

&lt;p&gt;for context:&lt;/p&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;
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				&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;   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;$ git checkout r2.4.9&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;   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;HEAD is now at 52fe0d2... BUMP 2.4.9&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;~/mongo/src/mongo/db$ grep -r twoStep *&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;   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;btree.cpp:    void BtreeBucket&amp;lt;V&amp;gt;::twoStepInsert(DiskLoc thisLoc, IndexInsertionContinuationImpl&amp;lt;V&amp;gt; &amp;amp;c,&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;btree.h:        void twoStepInsert(DiskLoc thisLoc, IndexInsertionContinuationImpl&amp;lt;V&amp;gt; &amp;amp;c, bool dupsAllowed) const;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;index.cpp:            _idx.head.btree&amp;lt;V&amp;gt;()-&amp;gt;twoStepInsert(_idx.head, *continuation, dupsAllowed);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="108390">SERVER-12550</key>
            <summary>Restore some form of two step (phase) index key insertion</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jan 2014 16:28:34 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:48 +0000</updated>
                            <resolved>Mon, 31 Mar 2014 04:45:54 +0000</resolved>
                                    <version>2.5.4</version>
                                    <fixVersion>2.6.0-rc3</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="532068" author="xgen-internal-githook" created="Wed, 2 Apr 2014 04:04:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12550&quot; title=&quot;Restore some form of two step (phase) index key insertion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12550&quot;&gt;&lt;del&gt;SERVER-12550&lt;/del&gt;&lt;/a&gt;: use Context instead of ReadContext and don&apos;t check shard version&lt;br/&gt;
              this happens later&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/91e679c2102b2870cfc0b2eeb31035eabc234deb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/91e679c2102b2870cfc0b2eeb31035eabc234deb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="528390" author="xgen-internal-githook" created="Sun, 30 Mar 2014 16:57:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12550&quot; title=&quot;Restore some form of two step (phase) index key insertion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12550&quot;&gt;&lt;del&gt;SERVER-12550&lt;/del&gt;&lt;/a&gt;: insert has 3 phases:&lt;br/&gt;
  a) outside of lock generate keys&lt;br/&gt;
  b) inside lock touch btree pages&lt;br/&gt;
  c) do insert&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ee42f85b2c7497a78b56eb6e8b293305125b4cc2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ee42f85b2c7497a78b56eb6e8b293305125b4cc2&lt;/a&gt;&lt;/p&gt;</comment>
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