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    <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-26156] Additional tests for index version v=2 in a sharded cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-26156</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Continued from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25156&quot; title=&quot;Create index version V2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25156&quot;&gt;&lt;del&gt;SERVER-25156&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Test migrating a chunk for a collection with a v=2 index on it from a 3.4 mongod to a newly added 3.4 stand-alone mongod shard in featureCompatibilityVersion=3.2 succeeds and creates a v=2 index on the recipient shard.&lt;/p&gt;

&lt;p&gt;Test migrating a chunk for a collection with a v=2 index on it from a 3.4 mongod to a newly added 3.2 stand-alone mongod shard fails.&lt;/p&gt;</description>
                <environment></environment>
        <key id="317031">SERVER-26156</key>
            <summary>Additional tests for index version v=2 in a sharded cluster</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Sep 2016 02:32:44 +0000</created>
                <updated>Sat, 19 Nov 2016 00:05:21 +0000</updated>
                            <resolved>Tue, 27 Sep 2016 15:57:50 +0000</resolved>
                                                    <fixVersion>3.3.15</fixVersion>
                                    <component>Index Maintenance</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1393937" author="xgen-internal-githook" created="Mon, 26 Sep 2016 19:48:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;mvankeulen94&apos;, u&apos;name&apos;: u&apos;Maria van Keulen&apos;, u&apos;email&apos;: u&apos;maria.vankeulen@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26156&quot; title=&quot;Additional tests for index version v=2 in a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26156&quot;&gt;&lt;del&gt;SERVER-26156&lt;/del&gt;&lt;/a&gt; Add migration tests for collections with V2 indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aa9ea14a57181f098a32f24a734f2c81563bee5c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aa9ea14a57181f098a32f24a734f2c81563bee5c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1387511" author="tess.avitabile" created="Mon, 19 Sep 2016 15:06:54 +0000"  >&lt;p&gt;I agree that this cannot be prevented.&lt;/p&gt;</comment>
                            <comment id="1387200" author="max.hirschhorn@10gen.com" created="Mon, 19 Sep 2016 02:37:02 +0000"  >&lt;p&gt;Responding to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25156?focusedCommentId=1329111&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1329111&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt; from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25156&quot; title=&quot;Create index version V2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25156&quot;&gt;&lt;del&gt;SERVER-25156&lt;/del&gt;&lt;/a&gt;:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Be sure to test index creation while setMinVersion is being run on the cluster, to make sure we don&apos;t get V2 indexes on some nodes and V1 on others.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;, how could we &lt;em&gt;not&lt;/em&gt; potentially end up with a v=2 index on one shard and a v=1 index on another shard? mongos doesn&apos;t resolve the default index version - each shard does for itself - so if running {&lt;tt&gt;setFeatureCompatibilityVersion: &quot;3.4&quot;&lt;/tt&gt;} fails on some shard and then a user creates a new index, then two shards can end up with different index versions when the index is created.&lt;/p&gt;</comment>
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