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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-84155] Add document checks for BSONColumn DocDiff application</title>
                <link>https://jira.mongodb.org/browse/SERVER-84155</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ensures the bucket document wasn&apos;t changed underneath us while generating the DocDiff from something like a direct write or synchronization bug in the BucketCatalog. This mechanism protects against data corruption.&lt;/p&gt;

&lt;p&gt;Rough draft of how we can achieve this:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;When committing a WriteBatch
	&lt;ul&gt;
		&lt;li&gt;We have a Struct {anchor, preImageBytes, postImageBytes}. The bytes are after the anchor point&lt;/li&gt;
		&lt;li&gt;Before inserting measurements into the builders, set the anchor and preImageBytes for each data field&lt;/li&gt;
		&lt;li&gt;Insert measurements into the builders from the WriteBatch&lt;/li&gt;
		&lt;li&gt;Set the postImageBytes&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Generate the DocDiff using the anchor as o(ffset) and postImageBytes as d(ata)&lt;/li&gt;
	&lt;li&gt;Pass this DocDiff into UpdateCommandRequest with preImageBytes.
	&lt;ul&gt;
		&lt;li&gt;In the query layer, we check that the current bucket document preImageBytes match after the anchor&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This is a primary only check&lt;/p&gt;</description>
                <environment></environment>
        <key id="2524148">SERVER-84155</key>
            <summary>Add document checks for BSONColumn DocDiff application</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Dec 2023 19:26:52 +0000</created>
                <updated>Fri, 19 Jan 2024 21:58:48 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
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