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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-50055] [optimization] Make mongod internally retry an operation that was blocking during a tenant migration critical section if the migration aborts</title>
                <link>https://jira.mongodb.org/browse/SERVER-50055</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1425691">SERVER-50055</key>
            <summary>[optimization] Make mongod internally retry an operation that was blocking during a tenant migration critical section if the migration aborts</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                            <label>pm-1791_milestone-H</label>
                    </labels>
                <created>Fri, 31 Jul 2020 19:06:50 +0000</created>
                <updated>Tue, 6 Dec 2022 02:13:36 +0000</updated>
                            <resolved>Tue, 17 Nov 2020 03:09:10 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3493082" author="esha.maharishi@10gen.com" created="Tue, 17 Nov 2020 03:09:10 +0000"  >&lt;p&gt;We decided at the 6 week design review today not to pursue this optimization for the first release of serverless.&lt;/p&gt;

&lt;p&gt;For non-transaction operations, the retry will be pushed up to the proxy, which should be a short round-trip (compared to being pushed back to the client).&lt;/p&gt;

&lt;p&gt;For transactions, the retry of the whole transaction will be pushed up to the client.&lt;/p&gt;

&lt;p&gt;This is considered acceptable since it should be rare for a migration to abort, and therefore for this optimization to be used.&lt;/p&gt;</comment>
                            <comment id="3320585" author="esha.maharishi@10gen.com" created="Tue, 4 Aug 2020 20:19:16 +0000"  >&lt;p&gt;We decided to put this on pause since it is an optimization and may or may not be worth the work and extra code complexity.&lt;/p&gt;

&lt;p&gt;The pro&apos;s are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The proxy does not need to handle retrying if the migration aborts&lt;/li&gt;
	&lt;li&gt;If the migration aborts, operations that were blocked are retried without an extra round trip back to the proxy&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The con&apos;s are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Both the server and proxy would have retry loops, increasing the system&apos;s complexity and test surface&lt;/li&gt;
	&lt;li&gt;The server may need separate retry loops for batched writes and other commands, increasing the code complexity&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The optimization only helps if the migration aborts while in the critical section, which is a narrow case.&lt;/p&gt;

&lt;p&gt;We should revisit whether the optimization is worth it when adding support for transactions, to see if it would prevent needing to abort the entire transaction and push the retry all the way back to the client (not just back to the proxy).&lt;/p&gt;</comment>
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