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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-54227] resharding metrics estimate algorithm</title>
                <link>https://jira.mongodb.org/browse/SERVER-54227</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4941c446e9091caa1f7151bd874c8d5b72c39bb8/src/mongo/db/s/resharding/resharding_metrics.cpp#L226&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/4941c446e9091caa1f7151bd874c8d5b72c39bb8/src/mongo/db/s/resharding/resharding_metrics.cpp#L226&lt;/a&gt;&lt;/p&gt;



&lt;p&gt;This algorithm estimates remaining operation time.&lt;/p&gt;

&lt;p&gt;I believe it&apos;s incorrect in the case of (bytesCopied&amp;gt;0 &amp;amp;&amp;amp; oplogEntriesApplied==0), which would be the forward-looking estimate made from within the copy phase.&lt;/p&gt;

&lt;p&gt;It also has significant numerical issues in the granularity of the integer math. Integer division takes place too eagerly via operator/ and via duration casting.&lt;/p&gt;

&lt;p&gt;Let&apos;s review, improve, and test it.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1609654">SERVER-54227</key>
            <summary>resharding metrics estimate algorithm</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Feb 2021 23:14:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:05 +0000</updated>
                            <resolved>Tue, 9 Feb 2021 04:55:50 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3606083" author="xgen-internal-githook" created="Tue, 9 Feb 2021 04:43:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54227&quot; title=&quot;resharding metrics estimate algorithm&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54227&quot;&gt;&lt;del&gt;SERVER-54227&lt;/del&gt;&lt;/a&gt; ReshardingMetrics fix &quot;remaining time&quot; estimate&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c6afa9e7eb6c5f9ea7ce19c86b1658d055ec3872&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c6afa9e7eb6c5f9ea7ce19c86b1658d055ec3872&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3597413" author="billy.donahue" created="Wed, 3 Feb 2021 17:38:47 +0000"  >&lt;p&gt;Existing tests for this only passed because they chose numbers that used exact multiples of elapsed and expected work, and so didn&apos;t observe rounding effects. And also only tested when the elapsed was at exactly the halfway point of the task, so the bug was hidden because it was only tested when progress == 1-progress.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3596457" author="billy.donahue" created="Wed, 3 Feb 2021 09:26:36 +0000"  >&lt;p&gt;Code Review &lt;a href=&quot;https://mongodbcr.appspot.com/764110019/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/764110019/&lt;/a&gt;&lt;/p&gt;</comment>
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