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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-73255] Make sure that query sampling handles WouldChangeOwningShard updates correctly</title>
                <link>https://jira.mongodb.org/browse/SERVER-73255</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, a shard key update that causes a document to move from one shard to another works as follows:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The client sends the update to some mongos.&lt;/li&gt;
	&lt;li&gt;The mongos forwards the update to the shard that owns the pre-update shard key value.&lt;/li&gt;
	&lt;li&gt;The shard throws WouldChangeOwningShard error.&lt;/li&gt;
	&lt;li&gt;If the update isn&apos;t running in a transaction, the mongos starts an internal transaction and retry to update to make sure that it still fails with a WouldChangeOwningShard error.&lt;/li&gt;
	&lt;li&gt;The mongos sends a delete the shard that owns the pre-update shard key value and an insert to the shard key that owns the post-update shard key.&lt;/li&gt;
	&lt;li&gt;The mongos commits the (internal) transaction.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Without additional handling, the additional WouldChangeOwningShard update and a delete may get sampled, and result in a sample population that is not representative of the user&apos;s workload. In addition, since the update is executed using a delete and an insert, it will show up in the OpObserver as an update so no diff will be sampled. So they will no get counted as a shard key update by the analyzeShardKey command.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2242135">SERVER-73255</key>
            <summary>Make sure that query sampling handles WouldChangeOwningShard updates correctly</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="13201">Fixed</resolution>
                                        <assignee username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 Jan 2023 17:30:14 +0000</created>
                <updated>Sun, 29 Oct 2023 21:27:30 +0000</updated>
                            <resolved>Thu, 2 Feb 2023 04:33:44 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5161191" author="xgen-internal-githook" created="Thu, 2 Feb 2023 03:54:13 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73255&quot; title=&quot;Make sure that query sampling handles WouldChangeOwningShard updates correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73255&quot;&gt;&lt;del&gt;SERVER-73255&lt;/del&gt;&lt;/a&gt; Make sure that query sampling handles WouldChangeOwningShard updates correctly&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ab4df8b48b07fe9737527453e10f092b6c34d0b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ab4df8b48b07fe9737527453e10f092b6c34d0b&lt;/a&gt;&lt;/p&gt;</comment>
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