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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-55331] Time-series tests can retrieve buckets out of order</title>
                <link>https://jira.mongodb.org/browse/SERVER-55331</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In some of our time-series tests, we check the underlying buckets and expect a certain order by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/612a3725d98381bf9c0777bcd6b2169cae33f4d1/jstests/core/timeseries/timeseries_bucket_limit_count.js#L60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sorting by _id&lt;/a&gt;. Note that the timestamp in the &lt;tt&gt;_id&lt;/tt&gt; is only precise to the second. This is typically fine, as &lt;a href=&quot;https://github.com/mongodb/mongo/blob/612a3725d98381bf9c0777bcd6b2169cae33f4d1/src/mongo/bson/oid.h#L43-L72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the counter at the end of the &lt;tt&gt;_id&lt;/tt&gt;&lt;/a&gt; will ensure the bucket order is maintained. However, consider the case where the counter overflows back to 0 across two buckets whose minimum time are within the same second. In this scenario, the second bucket will end up sorting before the first, breaking this bucket ordering assumption.&lt;/p&gt;

&lt;p&gt;Two potential solutions are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Sort by &lt;tt&gt;control.min&lt;span class=&quot;error&quot;&gt;&amp;#91;timeFieldName&amp;#93;&lt;/span&gt;&lt;/tt&gt;, which maintains the original millisecond precision of the timestamps, or by &lt;tt&gt;control.min._id&lt;/tt&gt; (assuming the individual documents&apos; ids are ordered), rather than &lt;tt&gt;_id&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Manually select the timestamps so that the buckets are always at least one second apart.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1653409">SERVER-55331</key>
            <summary>Time-series tests can retrieve buckets out of order</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 19 Mar 2021 05:25:23 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:05 +0000</updated>
                            <resolved>Fri, 7 May 2021 16:50:39 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3759812" author="xgen-internal-githook" created="Thu, 6 May 2021 20:48:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55331&quot; title=&quot;Time-series tests can retrieve buckets out of order&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55331&quot;&gt;&lt;del&gt;SERVER-55331&lt;/del&gt;&lt;/a&gt; fix sort order in timeseries tests when querying buckets collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37bb3ea1b31581d8a54c8f5f5f4159b6a669d480&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37bb3ea1b31581d8a54c8f5f5f4159b6a669d480&lt;/a&gt;&lt;/p&gt;</comment>
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