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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-13340] parallel creation of hashed shard key for multiple collections may not distribute them evenly</title>
                <link>https://jira.mongodb.org/browse/SERVER-13340</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is captured by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9258&quot; title=&quot;hash_presplit.js failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9258&quot;&gt;&lt;del&gt;SERVER-9258&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9260&quot; title=&quot;Race in hash_presplit.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9260&quot;&gt;&lt;del&gt;SERVER-9260&lt;/del&gt;&lt;/a&gt; where parallel unit tests were causing hashed key sharded collection not to be distributed evenly.&lt;/p&gt;

&lt;p&gt;The problem is that it&apos;s a real life scenario so our test should include trying to do it in parallel and we should fix the distribution of initial chunks - when a migration of empty chunk errors, it should possibly try again several times rather than just continuing on as that leaves all initial chunks on the original shard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="127442">SERVER-13340</key>
            <summary>parallel creation of hashed shard key for multiple collections may not distribute them evenly</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Mar 2014 11:40:12 +0000</created>
                <updated>Wed, 10 Dec 2014 23:05:34 +0000</updated>
                            <resolved>Wed, 9 Jul 2014 16:13:01 +0000</resolved>
                                    <version>2.4.9</version>
                    <version>2.6.0-rc2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="522703" author="scotthernandez" created="Tue, 25 Mar 2014 13:06:58 +0000"  >&lt;p&gt;It sounds like there are any number of reasons the moveChunks could fail, no? All of them would leave the chunks unevenly distributed, yes?&lt;/p&gt;</comment>
                            <comment id="522673" author="asya" created="Tue, 25 Mar 2014 12:12:04 +0000"  >&lt;p&gt;Add retry sounds like an enhancement.&lt;/p&gt;

&lt;p&gt;I was trying to describe a bug which is that due to races in migrations, new hashed sharded collections may end up unbalanced.&lt;/p&gt;</comment>
                            <comment id="522670" author="scotthernandez" created="Tue, 25 Mar 2014 12:01:40 +0000"  >&lt;p&gt;Is the gist of this just &quot;retry moveChunks which fail due to stale shard version/dlock conflict&quot; in order to get the desired distribution during the initial splits? If so, please re-write this issue to reflect that.&lt;/p&gt;</comment>
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