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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-24066] Ability to &quot;mark&quot; blocks as corrupt</title>
                <link>https://jira.mongodb.org/browse/SERVER-24066</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We&apos;ve encountered multiple instances of block corruption (not our fault) where the mongod refuses to start.  It would be nice to be able to &quot;mark&quot; a block as corrupt and have some tooling available to us to &quot;manually&quot; bring just the corrupt block in either via file copy or some other means.  If it&apos;s an index block, it would be nice to be able to simply tell mongod to kill the index and rebuild it.  Either way, it would be nice to have an alternative to &quot;nuking&quot; the entire database and performing a full resync for a (presumably) single corrupt block.&lt;/p&gt;

&lt;p&gt;Edit:&lt;br/&gt;
A customer just experienced an issue on a QA DB where they encountered a checksum error.  It would have been nice to be able to bring the database up by having it ignore the &quot;bad&quot; block.  Right now, they are in the process of running a repairDatabase.&lt;/p&gt;</description>
                <environment></environment>
        <key id="284756">SERVER-24066</key>
            <summary>Ability to &quot;mark&quot; blocks as corrupt</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="9">Done</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="shakir.sadikali@mongodb.com">Shakir Sadikali</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 May 2016 17:24:06 +0000</created>
                <updated>Tue, 6 Dec 2022 04:26:12 +0000</updated>
                            <resolved>Mon, 1 Oct 2018 16:53:10 +0000</resolved>
                                                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>2</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4045655" author="milkie" created="Wed, 8 Sep 2021 18:43:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shakir.sadikali&quot; class=&quot;user-hover&quot; rel=&quot;shakir.sadikali&quot;&gt;shakir.sadikali&lt;/a&gt;, in the time since this ticket was filed, we have enhanced the repair startup option to the server to handle more corrupt cases like this, which uses an enhanced &quot;salvage&quot; WiredTiger operation.  If the latest version of the server failed to repair a particular type of corruption, we&apos;re interested in improving such situations; please file a new ticket with the details of what happened if you still have the info.&lt;/p&gt;</comment>
                            <comment id="4045178" author="shakir.sadikali" created="Wed, 8 Sep 2021 15:56:44 +0000"  >&lt;p&gt;This is still a problem actually.&#160; We had a WT system experience block corruption where repairing didn&apos;t work.&#160; The customer tried to export/dump data but weren&apos;t able to because the process kept hitting the corrupt document(s).&#160; Being able&#160; to explicitly mark blocks/documents as &quot;being corrupt&quot; would allow the mongod to gracefully ignore these and keep the export/dump in progress.&lt;/p&gt;</comment>
                            <comment id="2019386" author="milkie" created="Mon, 1 Oct 2018 16:53:10 +0000"  >&lt;p&gt;I believe this request was MMAP-specific.&lt;/p&gt;</comment>
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