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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-8869] Command to merge two co-located, adjacent chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-8869</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is a metadata-only operation. If two chunks are co-located and share one boundary, we&apos;d like to be able to create a single chunk out of the two original in an atomic operation.&lt;/p&gt;

&lt;p&gt;This is the first step towards support generic chunk merges in the future.&lt;/p&gt;</description>
                <environment></environment>
        <key id="67510">SERVER-8869</key>
            <summary>Command to merge two co-located, adjacent chunks</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="alerner">Alberto Lerner</reporter>
                        <labels>
                            <label>balancer</label>
                            <label>chunks</label>
                            <label>merge</label>
                    </labels>
                <created>Wed, 6 Mar 2013 17:38:36 +0000</created>
                <updated>Mon, 11 Jul 2016 17:56:33 +0000</updated>
                            <resolved>Fri, 16 Aug 2013 14:28:55 +0000</resolved>
                                                    <fixVersion>2.5.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>3</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="404620" author="greg_10gen" created="Fri, 16 Aug 2013 14:28:55 +0000"  >&lt;p&gt;Merge command takes min/max bounds of the chunks to merge, and will only succeed if one or both of the two merged chunks is empty.&lt;/p&gt;

&lt;p&gt;Code is pretty flexible though, we should be able to relax when safe in the future.&lt;/p&gt;</comment>
                            <comment id="404083" author="auto" created="Thu, 15 Aug 2013 19:48:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8869&quot; title=&quot;Command to merge two co-located, adjacent chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8869&quot;&gt;&lt;del&gt;SERVER-8869&lt;/del&gt;&lt;/a&gt; mongos command passthrough for mergeChunks plus tests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d53c3240e3f83080f6a9e36edb9b118ff9f97f9b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d53c3240e3f83080f6a9e36edb9b118ff9f97f9b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="403293" author="auto" created="Wed, 14 Aug 2013 21:53:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8869&quot; title=&quot;Command to merge two co-located, adjacent chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8869&quot;&gt;&lt;del&gt;SERVER-8869&lt;/del&gt;&lt;/a&gt; command to merge co-located chunks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/350392319a81bc9a43dd7befff33ff41798504f3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/350392319a81bc9a43dd7befff33ff41798504f3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="402046" author="auto" created="Tue, 13 Aug 2013 16:37:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8869&quot; title=&quot;Command to merge two co-located, adjacent chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8869&quot;&gt;&lt;del&gt;SERVER-8869&lt;/del&gt;&lt;/a&gt; command to merge co-located chunks&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit a58ae77d0e5035cb4b541751dbe042e9173deea5.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5c03be3aca41801c807ed49666020c4a8088549d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5c03be3aca41801c807ed49666020c4a8088549d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="401988" author="auto" created="Tue, 13 Aug 2013 15:37:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8869&quot; title=&quot;Command to merge two co-located, adjacent chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8869&quot;&gt;&lt;del&gt;SERVER-8869&lt;/del&gt;&lt;/a&gt; command to merge co-located chunks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a58ae77d0e5035cb4b541751dbe042e9173deea5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a58ae77d0e5035cb4b541751dbe042e9173deea5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="393538" author="auto" created="Thu, 1 Aug 2013 14:03:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8869&quot; title=&quot;Command to merge two co-located, adjacent chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8869&quot;&gt;&lt;del&gt;SERVER-8869&lt;/del&gt;&lt;/a&gt; merge chunks: metadata clone and sharding state piece&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/57213bdd0d1abf214f4a7db3f6e4aa161a69a9c5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/57213bdd0d1abf214f4a7db3f6e4aa161a69a9c5&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="86656">DOCS-1837</issuekey>
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            <issuekey id="14543">SERVER-2487</issuekey>
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