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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-9875] Possible to accidentally create duplicate indexes which corrupts database</title>
                <link>https://jira.mongodb.org/browse/SERVER-9875</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;My loader scripts call ensureIndex to allow the database to automatically be generated, however it turns out that the current release of the perl API doesn&apos;t support the expiresAfterSecond argument, which I discovered after creating the index. Therefore I remove the index and created one in the background from the mongo console. Meanwhile my script restarted, which resulted in the database becoming corrupted (luckily recover did succeed). Have distilled out the underlying issue in an attached script.&lt;/p&gt;</description>
                <environment>RHEL 5, CentOS 6.4</environment>
        <key id="78234">SERVER-9875</key>
            <summary>Possible to accidentally create duplicate indexes which corrupts database</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jimmyjones2">Jimmy Jones</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Jun 2013 14:17:29 +0000</created>
                <updated>Sun, 16 Jun 2013 18:51:06 +0000</updated>
                            <resolved>Fri, 7 Jun 2013 14:24:21 +0000</resolved>
                                    <version>2.4.4</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="361362" author="jimmyjones2" created="Sun, 16 Jun 2013 18:51:06 +0000"  >&lt;p&gt;Thanks - looks as if it went into the release last week (0.701.4)&lt;/p&gt;</comment>
                            <comment id="361309" author="asya" created="Sun, 16 Jun 2013 15:02:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jimmyjones2&quot; class=&quot;user-hover&quot; rel=&quot;jimmyjones2&quot;&gt;jimmyjones2&lt;/a&gt; - the index is called &apos;expireAfterSeconds&apos; and not &apos;expiresAfterSeconds&apos; - looks like Perl driver added support for it in April: &lt;a href=&quot;https://github.com/mongodb/mongo-perl-driver/commit/f7a8846bfa633302b2957f7678ed93c6c87c3b6f#lib/MongoDB/Collection.pm&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-perl-driver/commit/f7a8846bfa633302b2957f7678ed93c6c87c3b6f#lib/MongoDB/Collection.pm&lt;/a&gt; as option &quot;expire_after_seconds&quot;.&lt;/p&gt;

&lt;p&gt;This is unrelated to the actual server bug you found, but in response to creating a TTL index via the Perl driver.&lt;/p&gt;</comment>
                            <comment id="355302" author="scotthernandez" created="Fri, 7 Jun 2013 14:24:21 +0000"  >&lt;p&gt;Thanks for the report. We have this down and scheduled here: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9856&quot; title=&quot;No check for building identical background indexes concurrently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9856&quot;&gt;&lt;del&gt;SERVER-9856&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The root cause is the (concurrent) background index creation.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;See attached script - basically it create two slightly different indexes with the same name, which hoses the database. Might need to tweak it to add more records if your server is faster than mine.&lt;/p&gt;</customfieldvalue>

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