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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-13589] Background index builds with 2.6.0 primary fail to complete on 2.4.x secondary nodes</title>
                <link>https://jira.mongodb.org/browse/SERVER-13589</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of April 28, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
A background index build using the &lt;tt&gt;ensureIndex&lt;/tt&gt; shell helper or the &lt;tt&gt;createIndexes&lt;/tt&gt; command on a 2.6.0 primary replica set member uses the &quot;c&quot; (command) code in the oplog to replicate the index to secondaries. Secondary replica set members fail to build indexes with the new &lt;tt&gt;createIndexes&lt;/tt&gt; command.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
This bug can lead to inconsistent indexes between primary and secondary members.  This may have a serious impact on performance after a replica set fail-over, if queries previously using the index now have to scan the collection. Users affected by this issue should audit their indexes by comparing the &lt;tt&gt;system.indexes&lt;/tt&gt; collections on all replica set members and make sure they are identical. If indexes are missing on the secondaries, please see the documentation page on &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/build-indexes-on-replica-sets/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;building indexes on replica sets&lt;/a&gt; to manually create them.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
As a workaround to build indexes in the background on a 2.6.0 primary, users can insert a document directly into the &lt;tt&gt;system.indexes&lt;/tt&gt; collection in a database with &lt;tt&gt;&#8220;background&#8221;:true&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Alternatively, starting the mongo shell with the &lt;tt&gt;--writeMode=compatibility&lt;/tt&gt; option avoids the issue altogether.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION&lt;/b&gt;&lt;br/&gt;
Using the &quot;i&quot; (insert) code on the &lt;tt&gt;system.indexes&lt;/tt&gt; collection for the oplog operation representing the &lt;tt&gt;createIndexes&lt;/tt&gt; command ensures compatibility with older versions of MongoDB and resolves the issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
Version 2.6.0 is affected by this bug.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
The patch is included in the 2.6.1 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;If you use the new createIndexes() command to build an index in the background, it may not build on replica set secondaries.  Inserting an index spec into system.indexes will still work correctly.&lt;/p&gt;

&lt;p&gt;Note that by default, the 2.6 MongoDB shell uses the createIndexes() command for the .ensureIndex() shell helper.  To force the shell to insert an entry into system.indexes for the .ensureIndex() shell helper, start the shell with the &quot;--writeMode=compatibility&quot; command line parameter.&lt;/p&gt;</description>
                <environment></environment>
        <key id="131179">SERVER-13589</key>
            <summary>Background index builds with 2.6.0 primary fail to complete on 2.4.x secondary nodes</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="linda.qin@mongodb.com">Linda Qin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Apr 2014 07:35:43 +0000</created>
                <updated>Mon, 11 Jul 2016 17:19:27 +0000</updated>
                            <resolved>Wed, 16 Apr 2014 11:48:37 +0000</resolved>
                                    <version>2.5.5</version>
                    <version>2.6.0</version>
                                    <fixVersion>2.6.1</fixVersion>
                    <fixVersion>2.7.0</fixVersion>
                                    <component>Index Maintenance</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="551934" author="xgen-internal-githook" created="Wed, 16 Apr 2014 17:49:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13589&quot; title=&quot;Background index builds with 2.6.0 primary fail to complete on 2.4.x secondary nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13589&quot;&gt;&lt;del&gt;SERVER-13589&lt;/del&gt;&lt;/a&gt; logOp inserts into system.indexes for index builds&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 430cd62d0dfd6d29a9b4768422981c7cd9f1e334)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f70518f8879c1dc3cf7721b6232cc1e84af39182&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f70518f8879c1dc3cf7721b6232cc1e84af39182&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="551475" author="xgen-internal-githook" created="Wed, 16 Apr 2014 11:47:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13589&quot; title=&quot;Background index builds with 2.6.0 primary fail to complete on 2.4.x secondary nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13589&quot;&gt;&lt;del&gt;SERVER-13589&lt;/del&gt;&lt;/a&gt; logOp inserts into system.indexes for index builds&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/430cd62d0dfd6d29a9b4768422981c7cd9f1e334&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/430cd62d0dfd6d29a9b4768422981c7cd9f1e334&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;1. Start a replica set&lt;br/&gt;
2. Insert a document to a collection.&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;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;db.docs.insert({x:1})&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;3. Build an index in background on the primary.&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;   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;db.docs.ensureIndex( { x: 1 }, { background: true } )&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;4. It fails to build the index in background on the secondary.&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;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;2014-04-15T17:27:31.707+1000 [repl writer worker 1] build index on: test.docs properties: { v: 1, key: { x: 1.0 }, name: &quot;x_1&quot;, ns: &quot;test.docs&quot;, background: true }&lt;/span&gt;&lt;/pre&gt;
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