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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-58352] Remove ClusterCursorManager::getNamespaceForCursorId(), and related simplifications</title>
                <link>https://jira.mongodb.org/browse/SERVER-58352</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is a pure refactor to simplify the &lt;tt&gt;ClusterCursorManager&lt;/tt&gt; code.&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;ClusterCursorManager&lt;/tt&gt; historically has ensured that the namespace of a cursor can be inferred from its cursor id. This is done by allocating cursor ids such that cursors belonging to the same namespace share the same 32-bit cursor id prefix, and then internally maintaining a map from cursor id prefix to namespace. This map is used specifically to implement the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ef95120bfa20d8f5a4a4d2487c83b205d1fc152/src/mongo/s/query/cluster_cursor_manager.h#L379&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;getNamespaceForCursorId()&lt;/tt&gt;&lt;/a&gt; method.&lt;/p&gt;

&lt;p&gt;After we delete support for the legacy OP_KILL_CURSORS wire protocol op code, there will be only one remaining caller of &lt;tt&gt;getNamespaceForCursorId()&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ef95120bfa20d8f5a4a4d2487c83b205d1fc152/src/mongo/s/commands/cluster_killoperations_cmd.cpp#L44&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;in the code for the _killOperations command&lt;/a&gt;. This code is trying to kill all the cursors associated with a set of operation keys, which could be reimplemented to be achieved without using &lt;tt&gt;getNamespaceForCursorId()&lt;/tt&gt;. In turn, this would allow us to delete &lt;tt&gt;getNamespaceForCursorId()&lt;/tt&gt; and simplify the internals of the &lt;tt&gt;ClusterCursorManager&lt;/tt&gt; to no longer maintain the map from cursor prefix to namespace.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1811358">SERVER-58352</key>
            <summary>Remove ClusterCursorManager::getNamespaceForCursorId(), and related simplifications</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="13201">Fixed</resolution>
                                        <assignee username="neil.shweky@mongodb.com">Neil Shweky</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 7 Jul 2021 21:23:07 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:12 +0000</updated>
                            <resolved>Fri, 29 Oct 2021 18:18:35 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4200958" author="xgen-internal-githook" created="Fri, 19 Nov 2021 15:49:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Neil Shweky&apos;, &apos;email&apos;: &apos;neilshweky@gmail.com&apos;, &apos;username&apos;: &apos;Neilshweky&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58352&quot; title=&quot;Remove ClusterCursorManager::getNamespaceForCursorId(), and related simplifications&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58352&quot;&gt;&lt;del&gt;SERVER-58352&lt;/del&gt;&lt;/a&gt; cleanup some dead code&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/db2c8ad84ac7e91288a3226f98afc39ba188e2eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/db2c8ad84ac7e91288a3226f98afc39ba188e2eb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4151540" author="xgen-internal-githook" created="Wed, 27 Oct 2021 14:22:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Neil Shweky&apos;, &apos;email&apos;: &apos;neilshweky@gmail.com&apos;, &apos;username&apos;: &apos;Neilshweky&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58352&quot; title=&quot;Remove ClusterCursorManager::getNamespaceForCursorId(), and related simplifications&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58352&quot;&gt;&lt;del&gt;SERVER-58352&lt;/del&gt;&lt;/a&gt;: Remove ClusterCursorManager::getNamespaceForCursorId(), and related simplifications&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/106b96548c5214a8e246a1cf6ac005a3985c16d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/106b96548c5214a8e246a1cf6ac005a3985c16d4&lt;/a&gt;&lt;/p&gt;</comment>
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