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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>
    </build-info>


<item>
            <title>[SERVER-35942] WiredTiger won&apos;t recognized collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-35942</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Dears,&lt;/p&gt;

&lt;p&gt;A few days ago, when I ran a VM snapshot, My VM crashed with Graylog application. Other packages and configurations has still OK, but the MongoDB doesn&apos;t.&lt;/p&gt;

&lt;p&gt;When I run command to start mongoDB, I have this error:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;sudo -u mongod -s&lt;/li&gt;
	&lt;li&gt;mongod --dbpath /srv/data/mongo&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;This is result:&lt;/p&gt;

&lt;p&gt;2018-06-28T15:22:47.718-0300 I - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; Detected data files in /srv/data/mongodb created by the &apos;wiredTiger&apos; storage engine, so setting the active storage engine to &apos;wiredTiger&apos;.&lt;br/&gt;
2018-06-28T15:22:47.718-0300 I STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; wiredtiger_open config: create,cache_size=3429M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),cache_cursors=false,log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),statistics_log=(wait=0),verbose=(recovery_progress),&lt;br/&gt;
2018-06-28T15:22:48.534-0300 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (0) &lt;span class=&quot;error&quot;&gt;&amp;#91;1530210168:534752&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;8076:0x7f8566148580&amp;#93;&lt;/span&gt;, &lt;a href=&quot;file:WiredTiger.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:WiredTiger.wt&lt;/a&gt;, connection: WiredTiger.turtle: encountered an illegal file format or internal value: (__wt_turtle_read, 291)&lt;br/&gt;
2018-06-28T15:22:48.534-0300 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (-31804) &lt;span class=&quot;error&quot;&gt;&amp;#91;1530210168:534841&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;8076:0x7f8566148580&amp;#93;&lt;/span&gt;, &lt;a href=&quot;file:WiredTiger.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:WiredTiger.wt&lt;/a&gt;, connection: the process must exit and restart: WT_PANIC: WiredTiger library panic&lt;br/&gt;
2018-06-28T15:22:48.534-0300 F - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; Fatal Assertion 28558 at src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp 366&lt;br/&gt;
2018-06-28T15:22:48.534-0300 F - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;***aborting after fassert() failure&lt;/p&gt;</description>
                <environment>Debian 9.0 with Graylog 2.4.5 and elasticsearch 5.6.10</environment>
        <key id="566843">SERVER-35942</key>
            <summary>WiredTiger won&apos;t recognized collections</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="usbezerra">Ubirata Bezerra</reporter>
                        <labels>
                            <label>envm</label>
                            <label>rge</label>
                            <label>rpu</label>
                            <label>trct</label>
                            <label>wtc</label>
                    </labels>
                <created>Mon, 2 Jul 2018 20:30:33 +0000</created>
                <updated>Tue, 14 Aug 2018 15:45:46 +0000</updated>
                            <resolved>Mon, 2 Jul 2018 20:55:01 +0000</resolved>
                                    <version>3.6.5</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1937238" author="nick.brewer" created="Mon, 2 Jul 2018 20:47:36 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=usbezerra&quot; class=&quot;user-hover&quot; rel=&quot;usbezerra&quot;&gt;usbezerra&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It looks like the &lt;tt&gt;WiredTiger.turtle&lt;/tt&gt; file you&apos;ve uploaded is badly corrupted - this file contains the metadata that is used to interpret &lt;tt&gt;WiredTiger.wt&lt;/tt&gt;, which is in turn used to interpret all other &lt;tt&gt;.wt&lt;/tt&gt; files. With that file in its current state, any repair attempts we make are going to be unsuccessful.  &lt;/p&gt;

&lt;p&gt;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 replica set member, 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 one is available.&lt;/p&gt;

&lt;p&gt;Some guidelines for avoiding 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>
                            <comment id="1937215" author="usbezerra" created="Mon, 2 Jul 2018 20:35:17 +0000"  >&lt;p&gt;i&apos;d like to start recover this database, or help to reach it. If doesn&apos;t, i&apos;d like to read theses collections or export them to another server already started.&lt;br/&gt;
Tks a lot&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="191019" name="WiredTiger" size="46" author="usbezerra" created="Mon, 2 Jul 2018 20:31:09 +0000"/>
                            <attachment id="191020" name="WiredTiger.turtle" size="991" author="usbezerra" created="Mon, 2 Jul 2018 20:31:09 +0000"/>
                            <attachment id="191017" name="WiredTiger.wt" size="299008" author="usbezerra" created="Mon, 2 Jul 2018 20:30:50 +0000"/>
                            <attachment id="191021" name="WiredTigerLAS.wt" size="4096" author="usbezerra" created="Mon, 2 Jul 2018 20:31:09 +0000"/>
                            <attachment id="191022" name="mongodb-backup.tar.bz2" size="84316461" author="usbezerra" created="Mon, 2 Jul 2018 20:31:39 +0000"/>
                            <attachment id="191018" name="sizeStorer.wt" size="36864" author="usbezerra" created="Mon, 2 Jul 2018 20:31:09 +0000"/>
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