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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-65972] Use Shard object instead of manually sending commands to a soon to be added shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-65972</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, when we&apos;re adding a shard into a cluster, we use a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7371fa1eb1008f2be98a1acdaa818c4ac82e9fa8/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp#L147&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;helper function&lt;/a&gt; to contact it and apply all addShard related operations. If we need to do any cursor related command, then we need to use the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3f1584a71210df4ba299d0eb74612302c9371cb/src/mongo/client/fetcher.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Fetcher API&lt;/a&gt;, like it was done as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65386&quot; title=&quot;Change addShard behavior to keep cluster parameters of the first shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65386&quot;&gt;&lt;del&gt;SERVER-65386&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;It make more sense to use a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3f1584a71210df4ba299d0eb74612302c9371cb/src/mongo/s/client/shard.h#L56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shard object&lt;/a&gt; and remove all boilerplate code we currently have as part of addShard. We actually already &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7371fa1eb1008f2be98a1acdaa818c4ac82e9fa8/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp#L602&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create a shard object&lt;/a&gt; but if we try to use it, every request fails with a ShardNotFound error.&lt;/p&gt;

&lt;p&gt;We should provide a function that allows opening a cursor and get batch information from a shard that is still not in the cluster, and we could extend the Shard class with a tailored implementation for the addShard scenario and remove all usages of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7371fa1eb1008f2be98a1acdaa818c4ac82e9fa8/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp#L147&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_runCommandForAddShard&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2033410">SERVER-65972</key>
            <summary>Use Shard object instead of manually sending commands to a soon to be added shard</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="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="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Tue, 26 Apr 2022 16:26:13 +0000</created>
                <updated>Thu, 26 Oct 2023 10:00:31 +0000</updated>
                                                                            <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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