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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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            <title>[SERVER-78301] Consider making bulkWrite base command size estimation on mongos more efficient</title>
                <link>https://jira.mongodb.org/browse/SERVER-78301</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73536&quot; title=&quot;Account for the size of the outgoing request in bulkWrite sub-batching logic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73536&quot;&gt;&lt;del&gt;SERVER-73536&lt;/del&gt;&lt;/a&gt;, we went with a naive implementation to estimate the size of a bulkWrite command (excluding its ops), where we just serialize a command object with fields copied over and placeholders added as needed, and take the size of that.&lt;br/&gt;
Our rationale for this was that:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;we only do it once up-front per bulkWrite command mongos receives&lt;/li&gt;
	&lt;li&gt;for most bulkWrite commands, we expect the &lt;tt&gt;ops&lt;/tt&gt; field (which we skip serializing here) to take up the bulk of the command&lt;/li&gt;
	&lt;li&gt;this is strictly less expensive than serializing an actual sub-batch command, which is something we often do numerous times for a single incoming request on mongos that targets multiple shards.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;That said, for certain workloads (e.g. all writes are to a single shard so we won&apos;t split batches often, and/or there are large top-level fields on the command) this could prove costly. &lt;/p&gt;

&lt;p&gt;when we do performance testing, it may be worth reevaluating this. A smarter implementation could do math to try to estimate the size without actually serializing the data, similar to what we do for estimating the sizes of individual ops. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2373782">SERVER-78301</key>
            <summary>Consider making bulkWrite base command size estimation on mongos more efficient</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-repl">Backlog - Replication Team</assignee>
                                    <reporter username="kaitlin.mahar@mongodb.com">Kaitlin Mahar</reporter>
                        <labels>
                            <label>milestone-2</label>
                    </labels>
                <created>Wed, 21 Jun 2023 16:15:21 +0000</created>
                <updated>Thu, 14 Sep 2023 19:34:31 +0000</updated>
                            <resolved>Thu, 14 Sep 2023 17:39:25 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5704970" author="JIRAUSER1265594" created="Thu, 14 Sep 2023 17:39:25 +0000"  >&lt;p&gt;Closing this unless we run into perf issues that can be traced back to this area of code&lt;/p&gt;</comment>
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