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    <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-66834] Zones created by defragmentation_util.js must always align with chunks </title>
                <link>https://jira.mongodb.org/browse/SERVER-66834</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the situation in which createAndDistributeChunks creates one chunk &amp;gt; 0 (min: {key: 0}, max: {key: $maxKey}) and then createRandomZones attempts to make 1 zone, the created zone will not line up with a chunk (the zone created will have bounds 0 --&amp;gt; 1000.&lt;/p&gt;

&lt;p&gt;This can cause the defragmenter to merge over zones in the first phase which can lead to a less than optimal result by the end of defragmentation. This is fine in production, because the defragmenter will just be a little less than optimal if zones aren&apos;t respected at the start of defragmentation, but it can cause test failures when there are only 3 chunks created and 1 zone.&lt;/p&gt;

&lt;p&gt;In order to prevent test failures, we should modify the behaviour of the defragmentation util to make sure that the zone we create always lines up with an existing chunk.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2056749">SERVER-66834</key>
            <summary>Zones created by defragmentation_util.js must always align with chunks </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="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="allison.easton@mongodb.com">Allison Easton</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 27 May 2022 14:59:12 +0000</created>
                <updated>Sun, 29 Oct 2023 21:37:38 +0000</updated>
                            <resolved>Fri, 7 Oct 2022 13:08:10 +0000</resolved>
                                                    <fixVersion>6.1.1</fixVersion>
                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4903194" author="xgen-internal-githook" created="Fri, 14 Oct 2022 12:19:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66834&quot; title=&quot;Zones created by defragmentation_util.js must always align with chunks &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66834&quot;&gt;&lt;del&gt;SERVER-66834&lt;/del&gt;&lt;/a&gt; Zones created by defragmentation_util.js must always align with chunks&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9dee997bd163ea0c0ab136ea74a95c58b1e70e98)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/83e3601a31bdaeee6908ca0342602b7987021a4d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/83e3601a31bdaeee6908ca0342602b7987021a4d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4903123" author="xgen-internal-githook" created="Fri, 14 Oct 2022 11:44:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66834&quot; title=&quot;Zones created by defragmentation_util.js must always align with chunks &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66834&quot;&gt;&lt;del&gt;SERVER-66834&lt;/del&gt;&lt;/a&gt; Zones created by defragmentation_util.js must always align with chunks&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9dee997bd163ea0c0ab136ea74a95c58b1e70e98)&lt;br/&gt;
Branch: v6.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/23e97da1316c159fa59c0469c49d35d84fec5a70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/23e97da1316c159fa59c0469c49d35d84fec5a70&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4885682" author="xgen-internal-githook" created="Fri, 7 Oct 2022 13:06:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66834&quot; title=&quot;Zones created by defragmentation_util.js must always align with chunks &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66834&quot;&gt;&lt;del&gt;SERVER-66834&lt;/del&gt;&lt;/a&gt; Zones created by defragmentation_util.js must always align with chunks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9dee997bd163ea0c0ab136ea74a95c58b1e70e98&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9dee997bd163ea0c0ab136ea74a95c58b1e70e98&lt;/a&gt;&lt;/p&gt;</comment>
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