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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-81370] Make all InitialSplitPolicy accept a set of available shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-81370</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The InitialSplitPolicy class is used to generate a list of initial chunks to be created during a shardCollection operation. The chunk distribution is based on the split policy, i.e., based on the input parameters and the collection state. When distributing the chunks to the shards, the shards are randomly shuffled, so two calls to &apos;&lt;a href=&quot;https://github.com/10gen/mongo/blob/26cd6a5821430bce23c4b85660ca7adebd8ef748/src/mongo/db/s/config/initial_split_policy.h#L97-L99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;createFirstChunks&lt;/a&gt;&apos; may not result in the same chunk distribution.&#160;&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to add a set of shards as a parameter in such a way that, if we call &apos;&lt;a href=&quot;https://github.com/10gen/mongo/blob/26cd6a5821430bce23c4b85660ca7adebd8ef748/src/mongo/db/s/config/initial_split_policy.h#L97-L99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;createFirstChunks&lt;/a&gt;&apos; for each split policy involved in the createCollection, we always return a chunk distribution that respects the given shards. With that, we guarantee that we will return a chunk distribution that distributes at least one chunk per given shard, and no new shards will be involved in the chunk distribution. &#160;&lt;/p&gt;

&lt;p&gt;It is not a goal of this ticket to always return the same chunk distribution.&#160;&lt;/p&gt;

&lt;p&gt;We have an example of this work at &lt;a href=&quot;https://github.com/10gen/mongo/blob/26cd6a5821430bce23c4b85660ca7adebd8ef748/src/mongo/db/s/config/initial_split_policy.h#L281&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SamplingBasedSplitPolicy&lt;/a&gt;, a split point building strategy for resharding.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2449182">SERVER-81370</key>
            <summary>Make all InitialSplitPolicy accept a set of available shards</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="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="pol.pinol@mongodb.com">Pol Pinol</assignee>
                                    <reporter username="pol.pinol@mongodb.com">Pol Pinol</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Sep 2023 15:18:18 +0000</created>
                <updated>Thu, 26 Oct 2023 10:50:47 +0000</updated>
                            <resolved>Thu, 26 Oct 2023 10:50:46 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5808897" author="xgen-internal-githook" created="Thu, 26 Oct 2023 10:40:39 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Pol Pinol Castuera&apos;, &apos;email&apos;: &apos;pol.pinol@mongodb.com&apos;, &apos;username&apos;: &apos;PolPinol&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81370&quot; title=&quot;Make all InitialSplitPolicy accept a set of available shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81370&quot;&gt;&lt;del&gt;SERVER-81370&lt;/del&gt;&lt;/a&gt; Make all InitialSplitPolicy accept a set of available shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d742ee1bda0acb84363bf5cd09aa51e082cc3cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d742ee1bda0acb84363bf5cd09aa51e082cc3cc&lt;/a&gt;&lt;/p&gt;</comment>
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