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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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            <title>[SERVER-67171] insert_with_data_size_aware_balancing.js fail: returning balancerComplaint as true when chunks are not fully balanced because orphanedCount is stale</title>
                <link>https://jira.mongodb.org/browse/SERVER-67171</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Some failures have been observed in &lt;a href=&quot;https://github.com/10gen/mongo/blob/9e4f58aa6bb73cbcd7e3f9f5a6dbcbc5c88b8254/jstests/concurrency/fsm_workloads/insert_with_data_size_aware_balancing.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;insert_with_data_size_aware_balancing.js&lt;/a&gt; because the &lt;a href=&quot;https://github.com/10gen/mongo/blob/9e4f58aa6bb73cbcd7e3f9f5a6dbcbc5c88b8254/jstests/concurrency/fsm_workloads/insert_with_data_size_aware_balancing.js#L109-L118&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;balancerCollectionStatus command&lt;/a&gt; is returning a &lt;tt&gt;balancerComplaint&lt;/tt&gt; as &lt;tt&gt;true&lt;/tt&gt; when data are not already fairly balanced because &lt;tt&gt;numOrphanDocs&lt;/tt&gt; is read by the balancer while it&apos;s stale.&lt;/p&gt;

&lt;p&gt;The detailed explanation of why is this happening can be found in the description of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66835&quot; title=&quot;[test-only bug] Compare number of chunks in balancing_based_on_size.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66835&quot;&gt;&lt;del&gt;SERVER-66835&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;A fix suggestion would be to change the test and wait a few more balancer rounds after the &lt;tt&gt;balancerComplaint&lt;/tt&gt; returns &lt;tt&gt;true&lt;/tt&gt;. Another option is to update the &lt;tt&gt;numOrphanDocs&lt;/tt&gt; variable at the same time the range deleter deletes the orphan chunks to avoid stale reads.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2065908">SERVER-67171</key>
            <summary>insert_with_data_size_aware_balancing.js fail: returning balancerComplaint as true when chunks are not fully balanced because orphanedCount is stale</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="silvia.surroca@mongodb.com">Silvia Surroca</assignee>
                                    <reporter username="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 10 Jun 2022 13:34:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:37:02 +0000</updated>
                            <resolved>Wed, 27 Jul 2022 09:48:21 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4707948" author="JIRAUSER1268536" created="Wed, 27 Jul 2022 09:46:31 +0000"  >&lt;p&gt;Fix commited under ticker &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67301&quot; title=&quot;Balancer may perform one unnecessary migration for a completely balanced collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67301&quot;&gt;&lt;del&gt;SERVER-67301&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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