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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-7469] Undocumented asynchronous index propagation over shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-7469</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When you create an index on one shard (connecting directly to its primary), other shards will eventually create the same index.&lt;/p&gt;

&lt;p&gt;It seems that it takes between 10 to 24 hours to propagate.&lt;br/&gt;
I have reproduced this behavior on two distinct clusters.&lt;/p&gt;

&lt;p&gt;Is this an expected behavior ?&lt;/p&gt;
</description>
                <environment></environment>
        <key id="54319">SERVER-7469</key>
            <summary>Undocumented asynchronous index propagation over shards</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="4">Incomplete</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kamaradclimber">Gr&#233;goire Seux</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Oct 2012 12:36:00 +0000</created>
                <updated>Fri, 26 Oct 2012 06:41:40 +0000</updated>
                            <resolved>Thu, 25 Oct 2012 14:29:59 +0000</resolved>
                                    <version>2.0.6</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="179480" author="kamaradclimber" created="Fri, 26 Oct 2012 06:41:40 +0000"  >&lt;p&gt;Ok chunk movement indeed can explain this.&lt;/p&gt;</comment>
                            <comment id="179187" author="greg_10gen" created="Thu, 25 Oct 2012 17:53:49 +0000"  >&lt;p&gt;Index creation happens as a first chunk moves to a new shard for a sharded collection - are you seeing this happen for unsharded collections (where all the data should exist on a single shard)?  The collection should be empty on the first chunk move, so there&apos;s not much impact.&lt;/p&gt;

&lt;p&gt;If you are directly connecting to a shard and creating an index for a sharded collection, this is unsupported as many operations may assume a sharded collection has the same indexes everywhere.  As chunks move, you&apos;d then get index creation sporadically (potentially on large datasets).  The intended use case is to create the index via mongos.  &lt;/p&gt;
</comment>
                            <comment id="179135" author="kamaradclimber" created="Thu, 25 Oct 2012 16:01:27 +0000"  >&lt;p&gt;My point is that this behavior is a bug because :&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;it is not documented&lt;/li&gt;
	&lt;li&gt;this index creation should occur only when adding a new shard&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="179081" author="ian@10gen.com" created="Thu, 25 Oct 2012 14:29:43 +0000"  >&lt;p&gt;Hi Gregoire, this project is intended for feature requests, improvements, and bug fixes. For questions like this please create a new discussion in our forum at &lt;a href=&quot;https://groups.google.com/forum/?fromgroups#!forum/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?fromgroups#!forum/mongodb-user&lt;/a&gt; - if the discussion there leads to the conclusion that this should be a feature request or bug ticket, then you should follow up with a ticket containing the appropriate details here.&lt;/p&gt;</comment>
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