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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-78385] Update findAndModify and deleteOne to not use two phase protocol if only one shard is targeted</title>
                <link>https://jira.mongodb.org/browse/SERVER-78385</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44422&quot; title=&quot;Allow findAndModify and delete one to target by query instead of extracted shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44422&quot;&gt;&lt;del&gt;SERVER-44422&lt;/del&gt;&lt;/a&gt; made it so that findAndModify and delete (with limit=1) still work if the two phase protocol is disabled and only the partial shard key is given, as long as only one shard is targeted.&lt;/p&gt;


&lt;p&gt;However, those changes have no effect on master because the two phase protocol will always be used if a partial shard key is given. This ticket should update the code for findAndModify and delete (with limit=1) to not use the two phase protocol if a partial shard key is given and only one shard is targeted.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2375743">SERVER-78385</key>
            <summary>Update findAndModify and deleteOne to not use two phase protocol if only one shard is targeted</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="wenqin.ye@mongodb.com">Wenqin Ye</assignee>
                                    <reporter username="wenqin.ye@mongodb.com">Wenqin Ye</reporter>
                        <labels>
                            <label>sharding-nyc-subteam3</label>
                    </labels>
                <created>Fri, 23 Jun 2023 14:42:02 +0000</created>
                <updated>Fri, 15 Sep 2023 20:02:48 +0000</updated>
                            <resolved>Fri, 15 Sep 2023 20:00:36 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5708415" author="JIRAUSER1253401" created="Fri, 15 Sep 2023 20:00:36 +0000"  >&lt;p&gt;Closing as this is actually not needed. The premise of the ticket was wrong, as the two phase write protocol will be skipped if a partial shard key is given and it targets a single shard.&#160;&lt;/p&gt;

&lt;p&gt;More specifically for findAndModify that happens here: &lt;a href=&quot;https://github.com/10gen/mongo/blob/c3cd9fcd6e2da113e8bf299abf893ac28d92859c/src/mongo/s/commands/cluster_find_and_modify_cmd.cpp#L758-L759&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/c3cd9fcd6e2da113e8bf299abf893ac28d92859c/src/mongo/s/commands/cluster_find_and_modify_cmd.cpp#L758-L759&lt;/a&gt;&lt;/p&gt;</comment>
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