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            <title>[SERVER-27425] Starting and finishing chunk migration takes Global S lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-27425</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In MongoDB 3.2 and earlier the shards take Global S lock during migration of chunks out of a shard. This happens both in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.10/src/mongo/db/s/migration_source_manager.cpp#L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;beginning&lt;/a&gt; and at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.10/src/mongo/db/s/migration_source_manager.cpp#L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;completion&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Given that migrations are per collection, we should be able to only use collection X or S lock instead.&lt;/p&gt;

&lt;p&gt;This problem does not apply to version 3.4 where the chunk migration code was changed significantly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="338929">SERVER-27425</key>
            <summary>Starting and finishing chunk migration takes Global S lock</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
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                <created>Wed, 14 Dec 2016 20:06:45 +0000</created>
                <updated>Tue, 6 Dec 2022 04:09:37 +0000</updated>
                            <resolved>Thu, 15 Dec 2016 21:25:00 +0000</resolved>
                                    <version>3.0.14</version>
                    <version>3.2.11</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1459393" author="kaloian.manassiev" created="Thu, 15 Dec 2016 21:25:00 +0000"  >&lt;p&gt;Due to the high risk of introducing a regression while fixing this in 3.2 and given that it has been fixed in 3.4, we won&apos;t do it in 3.2.&lt;/p&gt;</comment>
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