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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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            <title>[SERVER-66909] Investigate how to stop using ShardLocal</title>
                <link>https://jira.mongodb.org/browse/SERVER-66909</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Shard interface is difficult to use, and leads to bugs.&#160; There are two implementations of the Shard interface: ShardLocal and ShardRemote.&#160; However, they are not interchangeable.&#160; Throughout the ShardLocal class, many functions hit a MONGO_UNREACHABLE, despite the fact that we usually call these functions through the base class Shard.&lt;/p&gt;

&lt;p&gt;Furthermore, the Shard interface supports a generic `runCommand` function that at first glance seems to support arbitrary server commands. However, this is not the case for multiple reasons.&#160; First, DBDirectClient (which ShardLocal wraps) only supports CRUD operations.&#160; Second, DBDirectClient does not support session information in commands.&lt;/p&gt;

&lt;p&gt;We should use ShardRemote instead of ShardLocal when the CSRS talks to itself.&#160;&#160;&lt;/p&gt;

&lt;p&gt;There may exist times when the CSRS absolutely must bypass the networking stack.&#160; In those cases we should use a thin wrapper on DBDirectClient that enforces the limitations of DBDirectClient in its API and does not derive Shard (ShardLocal does not satisfy these conditions).&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;These issues have greatly complicated PM-2290.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2059079">SERVER-66909</key>
            <summary>Investigate how to stop using ShardLocal</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="3">Duplicate</resolution>
                                        <assignee username="andrew.witten@mongodb.com">Andrew Witten</assignee>
                                    <reporter username="andrew.witten@mongodb.com">Andrew Witten</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                            <label>sharding-nyc-subteam2-catalog-poc</label>
                    </labels>
                <created>Tue, 31 May 2022 20:21:17 +0000</created>
                <updated>Mon, 6 Jun 2022 18:27:14 +0000</updated>
                            <resolved>Mon, 6 Jun 2022 18:27:14 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
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