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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-57790] Minimise the impact of FCV upgrade/downgrade between 4.4 and 5.0 with large routing tables</title>
                <link>https://jira.mongodb.org/browse/SERVER-57790</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The format of the sharding catalog has been changed starting from version 5.0. The change impacts the contents of all entries in the config.databases/collections/chunks/shards system collections and the upgrade/downgrade steps need to update a lot of data. &lt;/p&gt;

&lt;p&gt;The data updates are synchronised per collection under the chunks lock, which means that for collections with a lot of chunks, chunk migrations can be blocked for a longer time. Since the chunk commit happens during the migration critical section, any shard which attempts to commit a chunk migration at that point in time will block access to the portion of the collection that it holds.&lt;/p&gt;

&lt;p&gt;In order to mitigate this impact, it is proposed that we do 2 things:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Make the beginning of &lt;tt&gt;setFCV&lt;/tt&gt; stop the balancer and the end re-enable it (if it wasn&apos;t enabled already).&lt;/li&gt;
	&lt;li&gt;Make chunk migration fail with a &lt;tt&gt;ConflictingOperationInProgress&lt;/tt&gt; error if it attempts to commit at this point in time&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Option (1) can be done later since it needs to remember if the balancer was stopped, but (2) is fairly easy and can be done earlier.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1788571">SERVER-57790</key>
            <summary>Minimise the impact of FCV upgrade/downgrade between 4.4 and 5.0 with large routing tables</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="13201">Fixed</resolution>
                                        <assignee username="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Jun 2021 16:58:58 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:00 +0000</updated>
                            <resolved>Fri, 16 Jul 2021 08:33:34 +0000</resolved>
                                    <version>5.0.0-rc2</version>
                                    <fixVersion>5.0.2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4107590" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:30:41 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3962484" author="xgen-internal-githook" created="Mon, 26 Jul 2021 13:01:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57790&quot; title=&quot;Minimise the impact of FCV upgrade/downgrade between 4.4 and 5.0 with large routing tables&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57790&quot;&gt;&lt;del&gt;SERVER-57790&lt;/del&gt;&lt;/a&gt; Stop the balancer thread while serving setFCV.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a3e0e9d2998bd9a1ce0f8f975b364ef614e2d57c)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a61de4f56d4f5d83e29117ebd845385f2dc356a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a61de4f56d4f5d83e29117ebd845385f2dc356a1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3962483" author="xgen-internal-githook" created="Mon, 26 Jul 2021 13:01:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57790&quot; title=&quot;Minimise the impact of FCV upgrade/downgrade between 4.4 and 5.0 with large routing tables&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57790&quot;&gt;&lt;del&gt;SERVER-57790&lt;/del&gt;&lt;/a&gt; abort chunk migration while an up/downgrade is in progress.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 804ddfe0dcf1b5f26e1afd83b47cb1ef5df888bd)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9f1d821bb54f7192fc5192e9cf891fc709c051cb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9f1d821bb54f7192fc5192e9cf891fc709c051cb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3945881" author="xgen-internal-githook" created="Fri, 16 Jul 2021 08:05:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57790&quot; title=&quot;Minimise the impact of FCV upgrade/downgrade between 4.4 and 5.0 with large routing tables&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57790&quot;&gt;&lt;del&gt;SERVER-57790&lt;/del&gt;&lt;/a&gt; Stop the balancer thread while serving setFCV.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a3e0e9d2998bd9a1ce0f8f975b364ef614e2d57c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a3e0e9d2998bd9a1ce0f8f975b364ef614e2d57c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3918000" author="xgen-internal-githook" created="Tue, 6 Jul 2021 14:31:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57790&quot; title=&quot;Minimise the impact of FCV upgrade/downgrade between 4.4 and 5.0 with large routing tables&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57790&quot;&gt;&lt;del&gt;SERVER-57790&lt;/del&gt;&lt;/a&gt; abort chunk migration while an up/downgrade is in progress.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/804ddfe0dcf1b5f26e1afd83b47cb1ef5df888bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/804ddfe0dcf1b5f26e1afd83b47cb1ef5df888bd&lt;/a&gt;&lt;/p&gt;</comment>
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