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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-28829] create generic flag on OperationShardingState to prevent accessing sharded namespaces</title>
                <link>https://jira.mongodb.org/browse/SERVER-28829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It can currently be done by setting a shardVersion on some dummy namespace to &quot;UNSHARDED&quot;, because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.6/src/mongo/db/s/operation_sharding_state.cpp#L82-L84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OperationShardingState::getShardVersion(const NamespaceString&amp;amp; nss) returns version UNSHARDED if the namespace requested does not match the one set&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;It would be nice not to rely on this trick, and instead have an explicit way of ensuring an operation is unsharded.&lt;/p&gt;</description>
                <environment></environment>
        <key id="374780">SERVER-28829</key>
            <summary>create generic flag on OperationShardingState to prevent accessing sharded namespaces</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="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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>MaxH</label>
                    </labels>
                <created>Mon, 17 Apr 2017 20:02:39 +0000</created>
                <updated>Fri, 27 Oct 2023 20:44:08 +0000</updated>
                            <resolved>Wed, 2 Nov 2022 18:53:55 +0000</resolved>
                                    <version>3.5.6</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4949488" author="max.hirschhorn@10gen.com" created="Wed, 2 Nov 2022 18:53:56 +0000"  >&lt;p&gt;Admittedly, I don&apos;t fully understand the motivation for this ticket however I do believe the problem has already been solved.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34325&quot; title=&quot;OperationShardingState should store namespace and db separately, in case a command is not on a full namespace&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34325&quot;&gt;&lt;del&gt;SERVER-34325&lt;/del&gt;&lt;/a&gt; changed OperationShardingState to support multiple NamespaceString although the service entry point only populates a single one from the command request.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42600&quot; title=&quot;Implement the FCV 4.4 checkShardVersion protocol&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42600&quot;&gt;&lt;del&gt;SERVER-42600&lt;/del&gt;&lt;/a&gt; changed OperationShardingState::getShardVersion() to return a boost::optional. And other work in MongoDB 5.0 (PM-1645) made it so shards no longer assume collections are unsharded and instead require recovering information from the config server by having an explicit &quot;unknown&quot; concept for the sharding metadata.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="1550859" author="esha.maharishi@10gen.com" created="Mon, 17 Apr 2017 20:03:06 +0000"  >&lt;p&gt;The linked ticket is an example of using the &quot;trick.&quot;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="373863">SERVER-28792</issuekey>
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