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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-56185] Investigate possible improvements with session migration and a chunk migration&apos;s critical section</title>
                <link>https://jira.mongodb.org/browse/SERVER-56185</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In current MongoDB code, the critical section will be entered regardless of whether the session migration has completed. This makes sense from a correctness standpoint &#8211; we must block writes before ensuring that all sessions associated with those writes have been migrated over. However, there exists the question of whether it&apos;s possible to coordinate the choice to enter the critical section with specific checkpoints in the critical section. Without such checkpointing, a migration could still take a long time completing the session migration while blocking writes.&lt;/p&gt;

&lt;p&gt;An example would be ensuring that all entries that originally existed in the on-disk session catalog when migration started have been copied over before entering the critical section.&#160;&lt;/p&gt;

&lt;p&gt;The cost of waiting on session migration checkpointing before entering the critical section is that it would allow more writes to come in, causing transferMods to take longer as well.&lt;/p&gt;

&lt;p&gt;This ticket is to investigate the possibility of a middle ground with checkpointing session migrations while not prolonging the length of the migration unnecessarily. Other solutions to this problem are also welcome.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1683081">SERVER-56185</key>
            <summary>Investigate possible improvements with session migration and a chunk migration&apos;s critical section</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="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Apr 2021 19:13:14 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:47 +0000</updated>
                            <resolved>Mon, 18 Oct 2021 12:45:05 +0000</resolved>
                                    <version>5.0.0</version>
                    <version>4.2.13</version>
                    <version>4.4.5</version>
                    <version>4.0.24</version>
                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>4.4.17</fixVersion>
                    <fixVersion>5.0.11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="4734991" author="xgen-internal-githook" created="Mon, 8 Aug 2022 15:42:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56185&quot; title=&quot;Investigate possible improvements with session migration and a chunk migration&amp;#39;s critical section&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56185&quot;&gt;&lt;del&gt;SERVER-56185&lt;/del&gt;&lt;/a&gt; Investigate possible improvements with session migration and a chunk migration&apos;s critical section&lt;br/&gt;
(cherry picked from commit 6e8bf2cc701d81c11ad3b898cb4c394933034ac3)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c0e5ce18648ccb6356c00db4a5fca05e24a9bfcd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c0e5ce18648ccb6356c00db4a5fca05e24a9bfcd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4704551" author="xgen-internal-githook" created="Tue, 26 Jul 2022 07:36:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56185&quot; title=&quot;Investigate possible improvements with session migration and a chunk migration&amp;#39;s critical section&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56185&quot;&gt;&lt;del&gt;SERVER-56185&lt;/del&gt;&lt;/a&gt; Investigate possible improvements with session migration and a chunk migration&apos;s critical section&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6e8bf2cc701d81c11ad3b898cb4c394933034ac3)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/977e631b79b0409905729d4bb89137c2bb0f865f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/977e631b79b0409905729d4bb89137c2bb0f865f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4125912" author="xgen-internal-githook" created="Fri, 15 Oct 2021 08:56:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56185&quot; title=&quot;Investigate possible improvements with session migration and a chunk migration&amp;#39;s critical section&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56185&quot;&gt;&lt;del&gt;SERVER-56185&lt;/del&gt;&lt;/a&gt; Investigate possible improvements with session migration and a chunk migration&apos;s critical section&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6e8bf2cc701d81c11ad3b898cb4c394933034ac3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6e8bf2cc701d81c11ad3b898cb4c394933034ac3&lt;/a&gt;&lt;/p&gt;</comment>
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