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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-54960] ReshardingMetrics time smearing</title>
                <link>https://jira.mongodb.org/browse/SERVER-54960</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ReshardingMetrics::OperationMetrics::TimeInterval&#160;is an &quot;active&quot; object, each with its own clockSource, and this means they are essentially independent unlinked stopwatches.&lt;/p&gt;

&lt;p&gt;This is redundant, but it also presents the architectural problem that ReshardingMetrics now needs a ServiceContext*, which is a much heavier dependency than necessary. All ReshardingMetrics really needs is one ClockSource*. The timeIntervals do not need their own copy of this ClockSource*.&lt;/p&gt;

&lt;p&gt;Since each TimeInterval is calling &lt;tt&gt;clockSource-&amp;gt;now()&lt;/tt&gt;&#160;internally, the metrics are susceptible to time smearing errors as the intervals are individually started and stopped with incoherent timing. While this doesn&apos;t have practical implications, it would perhaps make testing more difficult. We wouldn&apos;t for example be able to assert that the time spent in each phase add up to the total operation time. We would need to estimate some error terms or have flaky tests.&lt;/p&gt;

&lt;p&gt;A small change that would solve these problems would be to keep the &lt;tt&gt;ClockSource*&lt;/tt&gt;&#160;as a concern only of the ReshardingMetrics object, and when we lock its &lt;tt&gt;_mutex&lt;/tt&gt;, generate a single &lt;tt&gt;now()&lt;/tt&gt;&#160;call, so that everything the ReshardingMetrics records will be based on the instant at which its mutex was locked. I think this will simplify things. The TimeInterval methods start, end, and tryEnd, and duration would all accept a &lt;tt&gt;Date_t now&lt;/tt&gt;&#160;instead of making their own &lt;tt&gt;clockSource-&amp;gt;now()&lt;/tt&gt;&#160;calls internally.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1639770">SERVER-54960</key>
            <summary>ReshardingMetrics time smearing</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-autocommits</label>
                    </labels>
                <created>Thu, 4 Mar 2021 17:06:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:42 +0000</updated>
                            <resolved>Tue, 15 Jun 2021 03:47:46 +0000</resolved>
                                                    <fixVersion>5.0.0-rc2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4108085" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:56:34 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3880378" author="xgen-internal-githook" created="Wed, 16 Jun 2021 08:28:32 +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-54960&quot; title=&quot;ReshardingMetrics time smearing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54960&quot;&gt;&lt;del&gt;SERVER-54960&lt;/del&gt;&lt;/a&gt; ReshardingMetrics time smearing (and refactor)&lt;br/&gt;
Branch: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34632&quot; title=&quot;config.chunks change to config.cache.chunks creates a collection long name after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34632&quot;&gt;SERVER-34632&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/431106074ec36920816a002296f10d44fdf9d971&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/431106074ec36920816a002296f10d44fdf9d971&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3879329" author="xgen-internal-githook" created="Tue, 15 Jun 2021 18:53:50 +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-54960&quot; title=&quot;ReshardingMetrics time smearing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54960&quot;&gt;&lt;del&gt;SERVER-54960&lt;/del&gt;&lt;/a&gt; ReshardingMetrics time smearing (and refactor)&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 431106074ec36920816a002296f10d44fdf9d971)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd1c824fbddb22636bb9e67f641cfd1662828eee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd1c824fbddb22636bb9e67f641cfd1662828eee&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3877099" author="xgen-internal-githook" created="Mon, 14 Jun 2021 20:56:57 +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-54960&quot; title=&quot;ReshardingMetrics time smearing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54960&quot;&gt;&lt;del&gt;SERVER-54960&lt;/del&gt;&lt;/a&gt; ReshardingMetrics time smearing (and refactor)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/431106074ec36920816a002296f10d44fdf9d971&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/431106074ec36920816a002296f10d44fdf9d971&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3874497" author="billy.donahue" created="Sat, 12 Jun 2021 01:22:27 +0000"  >&lt;p&gt;Code Review&lt;br/&gt;
&lt;a href=&quot;https://mongodbcr.appspot.com/791250005/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/791250005/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3874424" author="billy.donahue" created="Fri, 11 Jun 2021 23:02:06 +0000"  >&lt;p&gt;I&apos;d like to take this one. There are other synchronization bugs in ReshardingMetrics.&lt;br/&gt;
I feel the implementation has the wrong shape overall and needs an (internal) refactor.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;ReshardingMetrics::getOperationRemainingTime()&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;appears to be unsynchronized. i feel like I filed a ticket about that too but I can&apos;t find it.&lt;br/&gt;
I&apos;ll throw that in while I&apos;m at it.&lt;/p&gt;</comment>
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