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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-83788] Insert-only bulkWrite sent from mongos to mongod should use errorsOnly:true</title>
                <link>https://jira.mongodb.org/browse/SERVER-83788</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For insert-only bulkWrite commands, &lt;tt&gt;errorsOnly:false&lt;/tt&gt; doesn&apos;t provide any additional information compared to &lt;tt&gt;errorsOnly:true&lt;/tt&gt; (summary mode). Therefore, any insert-only bulkWrite should always use &lt;tt&gt;errorsOnly:true&lt;/tt&gt; as responses are much cheaper to produce in summary mode. This should be possible because inserts either succeed with &lt;tt&gt;n: 1&lt;/tt&gt;, or fail with an error. It isn&apos;t possible for an insert to produce &lt;tt&gt;n: 0&lt;/tt&gt; while not having an associated error.&lt;/p&gt;

&lt;p&gt;This is not true for updates / deletes because 1) they can no-op without an error and 2) touch more than one document when &lt;tt&gt;multi:true&lt;/tt&gt;. Because of this we won&apos;t be able to figure out which update / delete contributed how much to the totals &lt;tt&gt;nModified&lt;/tt&gt; and &lt;tt&gt;nDeleted&lt;/tt&gt;. For example, for two updates &lt;tt&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;u1, u2&amp;#93;&lt;/span&gt;&lt;/tt&gt; if we receive a single number &lt;tt&gt;nModified: 1&lt;/tt&gt; in summary mode, from this we cannot figure out whether &lt;tt&gt;u1&lt;/tt&gt; or &lt;tt&gt;u2&lt;/tt&gt; produced the modification.&lt;/p&gt;

&lt;p&gt;The point of this work is to make the insert-only code path more performant. If somehow there is a way to make this work for updates and deletes as well, then that is great: we can completely get rid of &lt;tt&gt;errorsOnly:false&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Ideally, the driver itself will send &lt;tt&gt;errorsOnly:true&lt;/tt&gt; when it sees that it is sending an insert-only bulkWrite.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2514067">SERVER-83788</key>
            <summary>Insert-only bulkWrite sent from mongos to mongod should use errorsOnly:true</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="vishnu.kaushik@mongodb.com">Vishnu Kaushik</reporter>
                        <labels>
                            <label>milestone-2</label>
                    </labels>
                <created>Fri, 1 Dec 2023 16:04:55 +0000</created>
                <updated>Thu, 7 Dec 2023 19:27:34 +0000</updated>
                            <resolved>Thu, 7 Dec 2023 19:27:33 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="5933968" author="JIRAUSER1265594" created="Thu, 7 Dec 2023 19:27:34 +0000"  >&lt;p&gt;We decided this would be too complex to implement and not give enough benefit to warrant doing it&lt;/p&gt;</comment>
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