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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-23716] Stop sending init form of setShardVersion</title>
                <link>https://jira.mongodb.org/browse/SERVER-23716</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In addition, mongos now needs to start sending setShardVersion (0,0) before sending requests to unsharded collections, otherwise, the connection will never have ShardedConnectionInfo and no version checking will take place for that connection. In other words, if the collection was actually sharded, the shard will not throw a stale shard version exception.&lt;/p&gt;</description>
                <environment></environment>
        <key id="279692">SERVER-23716</key>
            <summary>Stop sending init form of setShardVersion</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="3">Duplicate</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>PM-108</label>
                    </labels>
                <created>Thu, 14 Apr 2016 14:50:51 +0000</created>
                <updated>Wed, 5 Apr 2017 16:44:17 +0000</updated>
                            <resolved>Mon, 23 Jan 2017 20:30:23 +0000</resolved>
                                    <version>3.3.4</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1483041" author="esha.maharishi@10gen.com" created="Mon, 23 Jan 2017 20:30:23 +0000"  >&lt;p&gt;Fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27625&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-27625&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The init form of setShardVersion is still sent solely to initialize a connection as &apos;sharded&apos;, but it no longer causes sharding initialization on the shard.&lt;/p&gt;</comment>
                            <comment id="1236181" author="spencer" created="Thu, 14 Apr 2016 18:22:01 +0000"  >&lt;p&gt;Hmm... that part about sending the (0,0) version for unsharded operations is a bit scary.  How are we going to ensure we haven&apos;t missed any places that operate on unsharded collections?&lt;/p&gt;

&lt;p&gt;Makes me wonder if we might be better off continuing to send the init form of SSV until we can kill SSV entirely as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17825&quot; title=&quot;Remove setShardVersion from shard version protocols &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17825&quot;&gt;&lt;del&gt;SERVER-17825&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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