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    <description>This file is an XML representation of an issue</description>
    <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-16216] mongodump --repair only scans forward under WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-16216</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Repair with mmapv1 in 2.6 would scan both forwards and backwards to maximize recovered data. mongodump --repair under WiredTiger only scans forward. This seems to be due to one or both of&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;mongod aborts when the repair cursor hits the damaged region (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16215&quot; title=&quot;mongodump --repair does not terminate gracefully under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16215&quot;&gt;&lt;del&gt;SERVER-16215&lt;/del&gt;&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;it looks like forward direction is hard-coded into WiredTigerRecordStore::getIteratorForRepair (see patch for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16171&quot; title=&quot;mongodump --repair not working under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16171&quot;&gt;&lt;del&gt;SERVER-16171&lt;/del&gt;&lt;/a&gt;).&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;To demonstrate that forward and backward scanning is possible with corrupted data (and as a potential workaround to this issue), try&lt;/p&gt;
&lt;p/&gt;
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                <environment></environment>
        <key id="169859">SERVER-16216</key>
            <summary>mongodump --repair only scans forward under WiredTiger</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="9">Done</resolution>
                                        <assignee username="mikeo@mongodb.com">Michael O&apos;Brien</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Nov 2014 13:21:08 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:44 +0000</updated>
                            <resolved>Tue, 18 Nov 2014 13:35:31 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                                    <component>Storage</component>
                    <component>Tools</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="766813" author="eliot" created="Tue, 18 Nov 2014 13:35:31 +0000"  >&lt;p&gt;Repair cursors are not going to be the way we handle corrupted WT docs. They were pretty suspect before, and remain so.&lt;br/&gt;
I.e. it can return garbage docs that are valid bson, but corrupt and ticking time bombs.&lt;br/&gt;
mongod --repair will be the preferred route.&lt;/p&gt;</comment>
                            <comment id="766808" author="ramon.fernandez" created="Tue, 18 Nov 2014 13:29:15 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mpobrien&quot; class=&quot;user-hover&quot; rel=&quot;mpobrien&quot;&gt;mpobrien&lt;/a&gt;, should this ticket be moved to the TOOLS project? Or is there some server support needed for this to work?&lt;/p&gt;</comment>
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