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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-2066] Can&apos;t shard a collection with an existing unique index. Error message not helpfull</title>
                <link>https://jira.mongodb.org/browse/SERVER-2066</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1) create a collection with a unique index (i created web.explorer with a unique index on &quot;ip&quot;)&lt;br/&gt;
2) create a sharding environment (configsrv, shardsrv, mongos)&lt;br/&gt;
3) connect to mongos/admin :&lt;/p&gt;

&lt;p&gt;&amp;gt; db.runCommand( &lt;/p&gt;
{ addshard : &quot;xxx.xxx.xxx.xxx:27018&quot; }
&lt;p&gt;);&lt;/p&gt;
{ &quot;shardAdded&quot; : &quot;shard0000&quot;, &quot;ok&quot; : 1 }
&lt;p&gt;&amp;gt; db.runCommand(&lt;/p&gt;
{&quot;enablesharding&quot; : &quot;web&quot;}
&lt;p&gt;)&lt;/p&gt;
{ &quot;ok&quot; : 1 }
&lt;p&gt;&amp;gt; db.runCommand({&quot;shardcollection&quot; : &quot;web.explorer&quot;, &quot;key&quot; : {&quot;_id&quot; : 1}})&lt;br/&gt;
{&lt;br/&gt;
       &quot;assertion&quot; : &quot;wrong type for BSONElement (unique) 1 != 8&quot;,&lt;br/&gt;
       &quot;assertionCode&quot; : 13111,&lt;br/&gt;
       &quot;errmsg&quot; : &quot;db assertion failure&quot;,&lt;br/&gt;
       &quot;ok&quot; : 0&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;This message &quot;wrong type for BSONElement (unique) 1 != 8&quot; should me more helpfull.&lt;br/&gt;
In this case, a message like &quot;Can&apos;t shard a collection with an existing unique index&quot; would be nice.&lt;br/&gt;
(i lost many hours to find what was the problem)&lt;/p&gt;

&lt;p&gt;thank you.&lt;/p&gt;</description>
                <environment></environment>
        <key id="13632">SERVER-2066</key>
            <summary>Can&apos;t shard a collection with an existing unique index. Error message not helpfull</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="ker2x">laurent laborde</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 Nov 2010 15:07:15 +0000</created>
                <updated>Tue, 6 Dec 2022 05:47:05 +0000</updated>
                            <resolved>Thu, 25 Jan 2018 20:20:07 +0000</resolved>
                                    <version>1.6.3</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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