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    <title>MongoDB Jira</title>
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    <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-20275] collMod fails on the sharded collection if the collection does not exists on all shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-20275</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;collMod&lt;/tt&gt; on a sharded collection (when it is not yet migrated to all shards) fails with an error message indicating the non-existence of the collections on some of the shards. This is not an expected behavoiur / failure in case of sharded collection that exists just on the Primary shard. The error has been introduced in 3.0.&lt;/p&gt;</description>
                <environment></environment>
        <key id="228291">SERVER-20275</key>
            <summary>collMod fails on the sharded collection if the collection does not exists on all 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="9">Done</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="anil.kumar">Anil Kumar</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Sep 2015 14:26:22 +0000</created>
                <updated>Tue, 6 Dec 2022 04:45:06 +0000</updated>
                            <resolved>Thu, 8 Mar 2018 20:03:44 +0000</resolved>
                                    <version>3.0.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1827819" author="esha.maharishi@10gen.com" created="Thu, 8 Mar 2018 20:03:44 +0000"  >&lt;p&gt;This issue was fixed in v3.6 by &lt;a href=&quot;https://github.com/mongodb/mongo/commit/726e5544108d7ef417de351d103f52c028feae3b#diff-e98011a462b1aa912aced499b8926a43R421&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line in this commit&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1171896" author="renctan" created="Fri, 12 Feb 2016 16:30:59 +0000"  >&lt;p&gt;Note that even though the command returns an error for the shard, the cluster is not in an error state since the shard does not have the collection. When a chunk is moved to this shard, the collection metadata will be copied over as part of the migration protocol.&lt;/p&gt;</comment>
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                            <attachment id="108903" name="coll_mod.js" size="490" author="randolph@mongodb.com" created="Fri, 12 Feb 2016 16:29:03 +0000"/>
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	&lt;li&gt;&lt;tt&gt;sh.enableSharding(&quot;test&quot;)&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;db.getSiblingDB(&quot;test&quot;).ext.insert({})&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;sh.shardCollection(&quot;test.ext&quot;, {_id: 1})&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;db.stats()&lt;/tt&gt; -&amp;gt; This would show the database / collection to be only on one of the shard (Primary shard for the database). &lt;tt&gt;sh.status()&lt;/tt&gt; would indicate this as well.&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;db.runCommand({collMod: &quot;ext&quot;}, {keyPattern: {x: 1}, expireAfterSeconds: 100} )&lt;/tt&gt; would succeed only on the Primary shard for this database on which the collection exists and will fail on all other shards resulting in error message being returned in the output.&lt;/li&gt;
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