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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-36065] file:WiredTiger.wt, connection: WiredTiger.turtle: encountered an illegal file format or internal value</title>
                <link>https://jira.mongodb.org/browse/SERVER-36065</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Dear,&lt;/p&gt;

&lt;p&gt;I have a mongodb instance, the files was deleted mistakenly, after recovery the data of the disk(recovery by&#160;extundelete), the mongodb instance can not be started. I searched with the error message, I think my issue seems like &lt;a href=&quot;http://jira.mongodb.org/browse/SERVER-26103&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;that one.&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I tried with --repair option, it&apos;s the same errors.&lt;/p&gt;

&lt;p&gt;I uploaded my&#160;WiredTiger.turtle and&#160;WiredTiger.wt, could you help me check whether it can be repaired? Could you help me fixed this issue? Thank you very very much.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="570211">SERVER-36065</key>
            <summary>file:WiredTiger.wt, connection: WiredTiger.turtle: encountered an illegal file format or internal value</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="nick.brewer">Nick Brewer</assignee>
                                    <reporter username="Tong">Mars Tong [X]</reporter>
                        <labels>
                            <label>envns</label>
                            <label>rfi</label>
                            <label>trct</label>
                            <label>wtc</label>
                    </labels>
                <created>Wed, 11 Jul 2018 11:56:18 +0000</created>
                <updated>Fri, 27 Jul 2018 15:37:11 +0000</updated>
                            <resolved>Mon, 16 Jul 2018 14:41:25 +0000</resolved>
                                    <version>3.4.10</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1948064" author="nick.brewer" created="Mon, 16 Jul 2018 14:41:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Tong&quot; class=&quot;user-hover&quot; rel=&quot;Tong&quot;&gt;Tong&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It looks like in this case the &lt;tt&gt;WiredTiger.turtle&lt;/tt&gt; file is badly corrupted, so a repair attempt isn&apos;t going to be effective in this case. In this situation, our best recommendation would be to &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/resync-replica-set-member/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;resync the affected node&lt;/a&gt; if it is a member of a replica set, or &lt;a href=&quot;https://docs.mongodb.com/manual/core/backups/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;restore from a backup&lt;/a&gt; if possible.&lt;/p&gt;

&lt;p&gt;To prevent this type of problem in the future please take note of the following guidelines to help mitigate any issues related to unreliable storage layers or server failures:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Make sure your &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/#disk-and-storage-systems&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;underlying storage is configured in an optimal way&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;Schedule and perform regular checks of the integrity of your filesystems and disks.&lt;/li&gt;
	&lt;li&gt;Make sure to update MongoDB to the &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;most recent version&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;Never manipulate the underlying database files in any way while &lt;tt&gt;mongod&lt;/tt&gt; is running.&lt;/li&gt;
	&lt;li&gt;Always keep up to date &lt;a href=&quot;https://docs.mongodb.com/manual/core/backups/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;backups of your databases&lt;/a&gt; and verify that you have a process in place to restore them.&lt;/li&gt;
	&lt;li&gt;Use a &lt;a href=&quot;https://docs.mongodb.com/manual/replication/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replica set&lt;/a&gt; for improved reliability.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Regards,&lt;br/&gt;
Nick&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="191572" name="WiredTiger.zip" size="11031" author="Tong" created="Wed, 11 Jul 2018 11:56:09 +0000"/>
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