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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-77648] Support sending OpMsgRequests via AsyncRequestSender and switch to using it for batched writes</title>
                <link>https://jira.mongodb.org/browse/SERVER-77648</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, &lt;tt&gt;AsyncRequestsSender&lt;/tt&gt; requests may only be created using a BSONObj version of a command to run.&lt;/p&gt;

&lt;p&gt;This means that any command run via this (which includes all write commands sent mongod -&amp;gt; mongos) must be serialized via its IDL-generated &lt;tt&gt;serialize&lt;/tt&gt; implementation that serializes to a &lt;tt&gt;BsonObjBuilder&lt;/tt&gt;. Notably, this means that any array in a command will be serialized as a BSON array, even if the command argument supports OP_MSG document sequences, which are more space-efficient.&lt;/p&gt;

&lt;p&gt;We should add support to &lt;tt&gt;AsyncRequestsSender&lt;/tt&gt; to allow running an &lt;tt&gt;OpMsgRequest&lt;/tt&gt; rather than just a BSONObj. Then we could switch to serializing commands using their IDL-generated &lt;tt&gt;serialize&lt;/tt&gt; implementations that produce &lt;tt&gt;OpMsgRequest&lt;/tt&gt;s and utilize the more efficient encoding. This would allow us to more efficiently send batched writes to shards.&lt;/p&gt;

&lt;p&gt;We would also want to update our write op size estimation logic if we do this, since currently we account for the per-array-element overhead for each op.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2354993">SERVER-77648</key>
            <summary>Support sending OpMsgRequests via AsyncRequestSender and switch to using it for batched writes</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="kaitlin.mahar@mongodb.com">Kaitlin Mahar</reporter>
                        <labels>
                    </labels>
                <created>Wed, 31 May 2023 17:27:50 +0000</created>
                <updated>Mon, 3 Jul 2023 18:59:56 +0000</updated>
                            <resolved>Mon, 3 Jul 2023 18:59:56 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5541322" author="JIRAUSER1273619" created="Mon, 3 Jul 2023 18:59:56 +0000"  >&lt;p&gt;Turning this Server ticket into a Project: &lt;a href=&quot;https://jira.mongodb.org/browse/PM-3403&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/PM-3403&lt;/a&gt;&lt;/p&gt;</comment>
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