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<item>
            <title>[SERVER-6640] Strict balancing guarantees with sharding tags</title>
                <link>https://jira.mongodb.org/browse/SERVER-6640</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 2.2.0-rc0 tag aware sharding behaves strange: it doesn&apos;t offer strict guarantee to which chunk a document will be placed when inserted. So if we have 2 tags for 2 shards (e.g. &apos;US-West&apos; and &apos;US-East&apos;) on an empty collection, inserting 2 documents which map to different tags will place both documents into one chunk; and the chunk location will depend on to which of the tags we&apos;ve made insertion first. This behavior scales to any number of documents: there&apos;s always a high chance to have documents &quot;misplaced&quot; this way after automatic chunk splitting.&lt;/p&gt;</description>
                <environment></environment>
        <key id="45764">SERVER-6640</key>
            <summary>Strict balancing guarantees with sharding tags</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="bios">Vadim Semenov</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Jul 2012 13:28:15 +0000</created>
                <updated>Tue, 6 Dec 2022 05:30:46 +0000</updated>
                            <resolved>Fri, 7 Oct 2016 18:44:40 +0000</resolved>
                                    <version>2.2.0-rc0</version>
                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1403231" author="kaloian.manassiev" created="Fri, 7 Oct 2016 18:44:40 +0000"  >&lt;p&gt;Please follow &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18361&quot; title=&quot;Sharding &amp;quot;top&amp;quot; splits should respect tag boundaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18361&quot;&gt;&lt;del&gt;SERVER-18361&lt;/del&gt;&lt;/a&gt; for more information on the fix for this bug.&lt;/p&gt;</comment>
                            <comment id="511792" author="greg_10gen" created="Fri, 7 Mar 2014 20:14:46 +0000"  >&lt;p&gt;Strict balancing guarantees aren&apos;t possible until the chunks are initially distributed, but agree the initial distribution should happen automatically when possible with tagged shards.&lt;/p&gt;</comment>
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