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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-55215] Handle small measurement counts in buckets for ARHASH</title>
                <link>https://jira.mongodb.org/browse/SERVER-55215</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When testing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54221&quot; title=&quot;Implement $sample pushdown into $_internalUnpackBucket &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54221&quot;&gt;&lt;del&gt;SERVER-54221&lt;/del&gt;&lt;/a&gt; we realized that if the gTimeseriesBucketMaxCount is significantly larger than the actual bucket counts we will exhaust the kMaxAttempt to get a non-duplicate document and fail the query. &lt;/p&gt;

&lt;p&gt;This behavior is not ideal. We should implement a fall-back mechanism when this is the case. Two ideas discussed is to figure out if we can cheaply compute the maximum bucket count, or use a trial stage to see if we are able to sample the collection, and if not fallback to topk sorting.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1649424">SERVER-55215</key>
            <summary>Handle small measurement counts in buckets for ARHASH</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="eric.cox@mongodb.com">Eric Cox</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Mon, 15 Mar 2021 20:33:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:16 +0000</updated>
                            <resolved>Fri, 9 Apr 2021 03:04:40 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3709332" author="xgen-internal-githook" created="Fri, 9 Apr 2021 02:30:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Cox&apos;, &apos;email&apos;: &apos;eric.cox@mongodb.com&apos;, &apos;username&apos;: &apos;ericox&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55215&quot; title=&quot;Handle small measurement counts in buckets for ARHASH&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55215&quot;&gt;&lt;del&gt;SERVER-55215&lt;/del&gt;&lt;/a&gt; Handle small measurement counts in buckets for ARHASH&lt;/p&gt;

&lt;p&gt;Co-authored-by: David Storch &amp;lt;david.storch@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/26083aaf57fded55e2ca4f82a536b1b5b3a1e6f7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/26083aaf57fded55e2ca4f82a536b1b5b3a1e6f7&lt;/a&gt;&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="308640" name="unpack bucket perf.xlsx" size="36433" author="ethan.zhang@mongodb.com" created="Thu, 8 Apr 2021 05:43:24 +0000"/>
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