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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-64809] Remove performViewChange flag for shardsvrCollModParticipant command</title>
                <link>https://jira.mongodb.org/browse/SERVER-64809</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently performViewChange is a flag sent from collMod coordinator to instruct whether shards should update view definitions as part of the command. This flag is set to true only for the primary shard, since only primary shard holds the view catalog. We can improve this by doing the check on the shard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2006798">SERVER-64809</key>
            <summary>Remove performViewChange flag for shardsvrCollModParticipant command</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="rui.liu@mongodb.com">Rui Liu</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Tue, 22 Mar 2022 20:59:23 +0000</created>
                <updated>Thu, 26 Oct 2023 10:12:10 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4431911" author="JIRAUSER1261330" created="Thu, 24 Mar 2022 11:27:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cris.insignarescuello&quot; class=&quot;user-hover&quot; rel=&quot;cris.insignarescuello&quot;&gt;cris.insignarescuello&lt;/a&gt; Yes this ticket is a refactoring work. The current solution works but it would be nicer if we can remove this flag and do the primary shard check locally on the shard. This means we could be able to send the same command to all shards in one batch, hence &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/s/collmod_coordinator.cpp#L295-L309&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;removing this block of code&lt;/a&gt;. I put the ticket to sharding since it probably requires knowledge on how to detect shard being primary in a safe way and also DDL coordinators are in general owned by the sharding team. This is probably a low-priority task though. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sergi.mateo-bellido&quot; class=&quot;user-hover&quot; rel=&quot;sergi.mateo-bellido&quot;&gt;sergi.mateo-bellido&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tommaso.tocci&quot; class=&quot;user-hover&quot; rel=&quot;tommaso.tocci&quot;&gt;tommaso.tocci&lt;/a&gt; helped me on the collMod coordinator and has more background on this.&lt;/p&gt;</comment>
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