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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-18970] fassert in gridfs after an unclean shutdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-18970</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am running a single mongodb server in CentOS v6.5 64bit.&lt;br/&gt;
One day, the server was down due to power&apos;s problem.&lt;br/&gt;
After server&apos;s restarting, there has been a problem with mongodb&apos;s gridfs.&lt;br/&gt;
Some files cannot be read, and repair cannot work. At that time, the mongo version wat v2.4.3.&lt;br/&gt;
I thought it wat old version&apos;s bug, so I upgraded the version to v2.6.10.&lt;br/&gt;
But the problem is still.&lt;/p&gt;

&lt;p&gt;I store many small files is gridfs, with gridfs&apos;s id to access the file, such as:&lt;br/&gt;
&lt;a href=&quot;http://xxxx/media/557e84883e2ff5522200001f/file.jpg&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://xxxx/media/557e84883e2ff5522200001f/file.jpg&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;How can I fix this problem? And ensure the old files id not be changed.&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment>CentOS v6.4</environment>
        <key id="210597">SERVER-18970</key>
            <summary>fassert in gridfs after an unclean shutdown</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="chrisloong">Chris Wang</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Jun 2015 11:29:27 +0000</created>
                <updated>Tue, 16 Jun 2015 12:16:45 +0000</updated>
                            <resolved>Tue, 16 Jun 2015 12:16:45 +0000</resolved>
                                    <version>2.4.3</version>
                    <version>2.6.10</version>
                                                    <component>GridFS</component>
                    <component>MMAPv1</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="941601" author="ramon.fernandez" created="Tue, 16 Jun 2015 12:15:36 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=chrisloong&quot; class=&quot;user-hover&quot; rel=&quot;chrisloong&quot;&gt;chrisloong&lt;/a&gt;. If an unclean shutdown of the machine leaves the filesystem in an inconsistent state then it&apos;s possible for any file that was open to appear corrupt. You may want to consider protecting against power failures with a UPS, or using replication, or both.&lt;/p&gt;

&lt;p&gt;Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="941204" author="chrisloong" created="Mon, 15 Jun 2015 22:16:19 +0000"  >&lt;p&gt;It seems that some files in gridfs were corruption.&lt;br/&gt;
I write a ruby script, export all fine files to disk.&lt;br/&gt;
Then enter mongo, drop fs.files, fs.chunks and the collection from database, and the command repair and dump can work.&lt;br/&gt;
At last, insert all files back to mongodb with ruby script.&lt;br/&gt;
Some files are lost, and all files id are changed.&lt;br/&gt;
It was a harsh lesson learned.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="77889" name="mongod.log" size="1059078" author="chrisloong" created="Mon, 15 Jun 2015 11:29:27 +0000"/>
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