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From "Devaraj K (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1594) When the disk becomes full Namenode is getting shutdown and not able recover
Date Mon, 24 Jan 2011 13:49:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12985686#action_12985686
] 

Devaraj K commented on HDFS-1594:
---------------------------------

When the disk becomes full, name node file system (fsimage, edits) is getting corrupted and
also name node is getting shutdown. When we try to restart, name node is not starting because
the name node file system is corrupted. 

This can be avoided this way,

We can implement a daemon to monitor the disk usage for periodically and if the disk usage
reaches the threshold value, put the name node into Safe mode so that no modification to file
system will occur. Once the disk usage reaches below the threshold, name node will be put
out of the safe mode. 


> When the disk becomes full Namenode is getting shutdown and not able recover
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-1594
>                 URL: https://issues.apache.org/jira/browse/HDFS-1594
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0
>         Environment: Linux linux124 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100
x86_64 x86_64 x86_64 GNU/Linux
>            Reporter: Devaraj K
>         Attachments: hadoop-root-namenode-linux124.log
>
>
> When the disk becomes full name node is shutting down and if we try to start after making
the space available It is not starting and throwing the below exception.
> {code:xml} 
> 2011-01-24 23:23:33,727 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem
initialization failed.
> java.io.EOFException
> 	at java.io.DataInputStream.readFully(DataInputStream.java:180)
> 	at org.apache.hadoop.io.UTF8.readFields(UTF8.java:117)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImageSerialization.readString(FSImageSerialization.java:201)
> 	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:185)
> 	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:93)
> 	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:60)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1089)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:1041)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:487)
> 	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:149)
> 	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:306)
> 	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:284)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:328)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:356)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:577)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:570)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1529)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1538)
> 2011-01-24 23:23:33,729 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.EOFException
> 	at java.io.DataInputStream.readFully(DataInputStream.java:180)
> 	at org.apache.hadoop.io.UTF8.readFields(UTF8.java:117)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImageSerialization.readString(FSImageSerialization.java:201)
> 	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:185)
> 	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:93)
> 	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:60)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1089)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:1041)
> 	at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:487)
> 	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:149)
> 	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:306)
> 	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:284)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:328)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:356)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:577)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:570)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1529)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1538)
> 2011-01-24 23:23:33,730 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:

> /************************************************************
> SHUTDOWN_MSG: Shutting down NameNode at linux124/10.18.52.124
> ************************************************************/
> {code} 

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