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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-66579] Initial tests of write heads vs. insert performance for RecordId format</title>
                <link>https://jira.mongodb.org/browse/SERVER-66579</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Ideally in Serverless we would like to shard on hash(_id) and use a RecordId format of (hash(_id), per-hash-counter), where the hash function has low cardinality. This allows split cleanup to be on ranges of RecordId&apos;s and merge to &quot;stitch&quot; the record heaps&lt;/p&gt;

&lt;p&gt;But, we might have to choose a very low cardinality to maintain few write heads per shard, and therefore have to refine/reshard most customers to allow them to have more shards.&lt;/p&gt;

&lt;p&gt;This ticket is to do initial tests of write heads vs. insert performance to determine an order of magnitude for a feasible default cardinality.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2050477">SERVER-66579</key>
            <summary>Initial tests of write heads vs. insert performance for RecordId format</summary>
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                                            <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>
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                                    <resolution id="4">Incomplete</resolution>
                                        <assignee username="backlog-server-serverless">[DO NOT USE] Backlog - Server Serverless</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
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                <created>Thu, 19 May 2022 14:55:26 +0000</created>
                <updated>Mon, 12 Jun 2023 18:06:09 +0000</updated>
                            <resolved>Mon, 12 Jun 2023 18:06:09 +0000</resolved>
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