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    <title>MongoDB Jira</title>
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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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<item>
            <title>[DOCS-3679] Document that addShard can break existing balance</title>
                <link>https://jira.mongodb.org/browse/DOCS-3679</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;When you have a lot of sharded collections perfectly balanced across X shards, adding a new shard will cause &lt;em&gt;all existing collections&lt;/em&gt; to rebalance across X+1 shards, which might take some time.&lt;/p&gt;

&lt;p&gt;I suggest to put a note about this in our docs, as some users apparently expect mongoS to only rebalance newly sharded collections.&lt;/p&gt;</description>
                <environment>&lt;a href=&quot;http://docs.mongodb.org/manual/reference/command/addShard/&quot;&gt;http://docs.mongodb.org/manual/reference/command/addShard/&lt;/a&gt;</environment>
        <key id="144637">DOCS-3679</key>
            <summary>Document that addShard can break existing balance</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Jun 2014 17:11:13 +0000</created>
                <updated>Mon, 16 Mar 2015 23:56:41 +0000</updated>
                            <resolved>Wed, 9 Jul 2014 18:01:12 +0000</resolved>
                                                    <fixVersion>v1.3.8</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="653408" author="xgen-internal-githook" created="Wed, 9 Jul 2014 18:00:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3679&quot; title=&quot;Document that addShard can break existing balance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3679&quot;&gt;&lt;del&gt;DOCS-3679&lt;/del&gt;&lt;/a&gt;: adding note about balancing to addShard pages&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/e2b7d708f263e7f900a371985ff74a91195827aa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/e2b7d708f263e7f900a371985ff74a91195827aa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="639066" author="sflint@sailthru.com" created="Mon, 30 Jun 2014 18:53:05 +0000"  >&lt;p&gt;This is relevant when you are doing time series in collections, because you want to expand the sharded cluster for the future but not worry about balancing the past.   I had to turn the balancer off the use the sh.diasbleBalacning() for all previous collections.  Then I had to re create all future collections to use the 4 shards instead of 3.    This was more of an over site on my part but it was extremely hard to fix.&lt;/p&gt;</comment>
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