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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-1317] background index creation blocks &quot;creation&quot; of existing indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-1317</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When background creating an index, creation of other indexes is blocked, as described in the docs: &quot;Only one index build at a time is permitted per collection.&quot;. However, this has the side effect that index creation of other indexes fails even if the index already exists. This is a specific problem when called indirectly from an ORM such as mongoid which tries to create indexes for its models on initialization. As a result, a server (e.g.: a rails instance) that uses that ORM cannot be restarted while a background index build is in progress because the attempted index creation (even though the index already exists) fails.&lt;/p&gt;

&lt;p&gt;The error message from the mongo driver:&lt;/p&gt;

&lt;p&gt;/opt/ruby-enterprise-1.8.7-2010.01/lib/ruby/gems/1.8/gems/mongo-1.0.1/lib/../lib/mongo/collection.rb:406:in `create_index&apos;:Mongo::OperationFailure: Failed to create index {:key=&amp;gt;&lt;/p&gt;
{&quot;status&quot;=&amp;gt;1}
&lt;p&gt;, :unique=&amp;gt;false, :name=&amp;gt;&quot;status_1&quot;, :ns=&amp;gt;&quot;thatdb.messages&quot;} &lt;/p&gt;

&lt;p&gt;This error went away as soon as the background index creation was done.&lt;/p&gt;

&lt;p&gt;The ideal fix would be to allow multiple indexes to be created at once. A short term fix would be to have ensureIndex return success if the index already exists, regardless of what else might be happening.&lt;/p&gt;</description>
                <environment>linux, 64-bit</environment>
        <key id="12279">SERVER-1317</key>
            <summary>background index creation blocks &quot;creation&quot; of existing indexes</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="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="fields">Adam Fields</reporter>
                        <labels>
                    </labels>
                <created>Tue, 29 Jun 2010 13:45:29 +0000</created>
                <updated>Tue, 12 Jul 2016 00:28:57 +0000</updated>
                            <resolved>Thu, 23 Sep 2010 21:03:32 +0000</resolved>
                                    <version>1.4.2</version>
                                    <fixVersion>1.7.1</fixVersion>
                                                        <votes>4</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="18474" author="auto" created="Thu, 23 Sep 2010 21:03:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: check for background indexing in progress after dup check &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1317&quot; title=&quot;background index creation blocks &amp;quot;creation&amp;quot; of existing indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1317&quot;&gt;&lt;del&gt;SERVER-1317&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/c088ca1af8b410248aea7cfdda58c17550215f5e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/c088ca1af8b410248aea7cfdda58c17550215f5e&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="14367">SERVER-2444</issuekey>
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