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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-3866] reIndex() on secondary drops all indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-3866</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is &lt;b&gt;huge&lt;/b&gt; issue.&lt;/p&gt;

&lt;p&gt;I ran &lt;tt&gt;reIndex&lt;/tt&gt; on one of our collections and this was the output:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;After doing this and calling &lt;tt&gt;getIndexes&lt;/tt&gt; and empty list is returned. Our indexes are indeed gone.&lt;/p&gt;

&lt;p&gt;Luckily we ran this on a secondary machine, but this is a huge problem.&lt;/p&gt;

&lt;p&gt;&lt;em&gt;This issue does not affect reindexing on a primary.  Of course one typically does not reindex on a primary.&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;Workaround: Start the target mongod without &quot;--replSet&quot; and on a different port, reindex, and then restart mongod again with its normal --replSet command line.  Be sure to use a different port number so no traffic other than administrative hits the machine during this maintenace procedure.&lt;/em&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="22290">SERVER-3866</key>
            <summary>reIndex() on secondary drops all indexes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="mitchellh">Mitchell Hashimoto</reporter>
                        <labels>
                            <label>indexing</label>
                    </labels>
                <created>Wed, 14 Sep 2011 20:57:18 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:18 +0000</updated>
                            <resolved>Thu, 15 Sep 2011 02:51:31 +0000</resolved>
                                    <version>2.0.0</version>
                                    <fixVersion>1.8.4</fixVersion>
                    <fixVersion>2.0.1</fixVersion>
                    <fixVersion>2.1.0</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="60440" author="auto" created="Fri, 14 Oct 2011 04:01:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&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: backport of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3866&quot; title=&quot;reIndex() on secondary drops all indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3866&quot;&gt;&lt;del&gt;SERVER-3866&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: v1.8&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/58a3ee1f9e39877ffee65564697c43ac647b001d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/58a3ee1f9e39877ffee65564697c43ac647b001d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="54328" author="auto" created="Thu, 15 Sep 2011 02:51:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&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: fix reIndex on secondaries &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3866&quot; title=&quot;reIndex() on secondary drops all indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3866&quot;&gt;&lt;del&gt;SERVER-3866&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: v2.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/692f4ec8dfbb75c5d2f5a28b70231f8f95d4b95e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/692f4ec8dfbb75c5d2f5a28b70231f8f95d4b95e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="54291" author="scotthernandez" created="Wed, 14 Sep 2011 23:19:54 +0000"  >&lt;p&gt;If you have lost your indexes you can do a &quot;mongodump -d &amp;lt;dbname&amp;gt;&quot; to create a dump of the index definitions from the primary, and then restore them on the secondary. In order to do a mongorestore of the indexes you will need to restart the secondary without --replSet and on a different port (so it does not confuse the other replica set members). Before you restore the indexes please make sure that you have enough oplog to last the time it takes for all index creation. You may want to restore the indexes in batches so that replication can catch up between the index builds.&lt;/p&gt;

&lt;p&gt;To avoid the problem all together, make sure to start up without &quot;--replSet&quot; and on a different port, before you do the reIndex on the secondary node.&lt;/p&gt;</comment>
                            <comment id="54278" author="auto" created="Wed, 14 Sep 2011 22:23:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@10gen.com&apos;}
&lt;p&gt;Message: Add test for reindexing on secondaries: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3866&quot; title=&quot;reIndex() on secondary drops all indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3866&quot;&gt;&lt;del&gt;SERVER-3866&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/19a94b8d2db9d2d028cdedba965dc4cae127a692&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/19a94b8d2db9d2d028cdedba965dc4cae127a692&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="54271" author="auto" created="Wed, 14 Sep 2011 21:58:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&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: fix reIndex on secondaries &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3866&quot; title=&quot;reIndex() on secondary drops all indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3866&quot;&gt;&lt;del&gt;SERVER-3866&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b88b810d28fc0060e3405702dcb492dfe9355af2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b88b810d28fc0060e3405702dcb492dfe9355af2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="54261" author="spencer" created="Wed, 14 Sep 2011 21:33:18 +0000"  >&lt;p&gt;I have successfully reproduced the problem.  It happens whenever calling a reindex on a secondary.  This problem is not new to 2.0, but is just being discovered now as people are trying to reindex all their databases to upgrade to the new index format.&lt;/p&gt;</comment>
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