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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-40249] Select better variable names for migration insert/update observations.</title>
                <link>https://jira.mongodb.org/browse/SERVER-40249</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h2&gt;
&lt;p&gt;Due to an assumption ascertained from Replication code with a bug (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40248&quot; title=&quot;OplogEntry&amp;#39;s getOperationToApply() returns incorrect field for updates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40248&quot;&gt;&lt;del&gt;SERVER-40248&lt;/del&gt;&lt;/a&gt;), we select from the incorrect field when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/01d8fbb1f0373f0fcca7b2d602f1e593cdc5a379/src/mongo/db/s/op_observer_sharding_impl.cpp#L183-L186&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;applying update operations&lt;/a&gt; from a multi-statement transaction. We should be applying from the &lt;tt&gt;o&lt;/tt&gt; field, &lt;em&gt;not&lt;/em&gt; the &lt;tt&gt;o2&lt;/tt&gt; field.&lt;/p&gt;

&lt;p&gt;We should also make sure that current testing is up-to-par for this opObserver &amp;#8211; basic testing should have caught this bug.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;InvestigationUpdate&quot;&gt;&lt;/a&gt;Investigation Update&lt;/h2&gt;
&lt;p&gt;It turns out that this bug actually isn&apos;t a bug, but for reasons previously unknown. For inserts and updates, the migration cloner transfer mods stage assumes that we are given only the _id, and reaches into the storage subsystem to retrieve the full document. The document that we pass into the cloner on transaction commit is exactly that &amp;#8211; the _id. So the code is correct, but variables are named incorrectly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="720218">SERVER-40249</key>
            <summary>Select better variable names for migration insert/update observations.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Wed, 20 Mar 2019 23:14:54 +0000</created>
                <updated>Fri, 29 Mar 2019 18:16:02 +0000</updated>
                            <resolved>Fri, 29 Mar 2019 18:16:02 +0000</resolved>
                                    <version>4.1.9</version>
                                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2196341" author="blake.oler" created="Fri, 29 Mar 2019 18:15:57 +0000"  >&lt;p&gt;Decided that the proposed changes weren&apos;t significant enough to push this ticket through. Closing as Won&apos;t Fix.&lt;/p&gt;</comment>
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