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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-76976] Programmatic API to get information on sharded collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-76976</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Some functionalities of the drivers and Mongo Shell require access to information on the shared collections. Such information is persisted in the &lt;tt&gt;config&lt;/tt&gt; database owned by the Config Server.&#160;&lt;/p&gt;

&lt;p&gt;Commands, like &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/method/db.collection.getShardDistribution/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;db.collection.getShardDistribution()&lt;/a&gt;, are currently implemented by accessing directly to these config collections, which requires to be aware of implementation details that could change from one version to another of the server.&lt;/p&gt;

&lt;p&gt;The idea is to decouple these command implementations from the internal representation of the system collections by exposing a programmatic API. Such API can be used to retrieve information on sharded collections, ensuring support and consistency regardless the internal representation of this information.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2336698">SERVER-76976</key>
            <summary>Programmatic API to get information on sharded collections</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="antonio.fuschetto@mongodb.com">Antonio Fuschetto</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Wed, 10 May 2023 07:40:33 +0000</created>
                <updated>Thu, 26 Oct 2023 09:56:02 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5413725" author="kaloian.manassiev" created="Wed, 10 May 2023 08:51:45 +0000"  >&lt;p&gt;It is not urgent at all.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Title&lt;/b&gt;&lt;br/&gt;
Implementation-agnostic API for sharding distribution&lt;br/&gt;
&lt;b&gt;Summary&lt;/b&gt;&lt;br/&gt;
This project is about exposing an API to external services to be able to query the sharding distribution, which hides the implementation details and the persistence formats of the config server.&lt;br/&gt;
&lt;b&gt;Motivation&lt;/b&gt;&lt;br/&gt;
There have been numerous cases where for performance, new functionality or bug fixes we have had to change the persistence format of the config server collections (predominantly, config.databases, collections, chunks). Such changes break external services which consume this information and require sharding projects to also have to take that into account.&lt;/p&gt;</comment>
                            <comment id="5413682" author="kaloian.manassiev" created="Wed, 10 May 2023 08:27:35 +0000"  >&lt;p&gt;This looks like something that might need a Scope and sign-off from the downstream teams. So it is probably better suited to be a mini-project.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cris.insignarescuello%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;cris.insignarescuello@mongodb.com&quot;&gt;cris.insignarescuello@mongodb.com&lt;/a&gt;: Should we convert this into a mini-Epic?&lt;/p&gt;</comment>
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