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From Manoj Sah <manoj.s...@cloudwick.com>
Subject Re: unable to restart namenode on hadoop 1.0.4
Date Mon, 30 Sep 2013 08:01:12 GMT
Hi,
http://stackoverflow.com/questions/5490805/hadoop-nullpointerexcep

try this link

Thanks
Manoj


On Mon, Sep 30, 2013 at 1:03 PM, Ravi Shetye <ravishetye@gmail.com> wrote:

> Can some one please help me about how I go ahead debugging the issue.The
> NN log has the following error stack
>
> 2013-09-30 07:28:42,768 INFO
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system
> started
> 2013-09-30 07:28:42,967 INFO
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi
> registered.
> 2013-09-30 07:28:42,972 WARN
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already
> exists!
> 2013-09-30 07:28:42,978 INFO
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source jvm
> registered.
> 2013-09-30 07:28:42,980 INFO
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source
> NameNode registered.
> 2013-09-30 07:28:43,012 INFO org.apache.hadoop.hdfs.util.GSet: VM type
>   = 64-bit
> 2013-09-30 07:28:43,012 INFO org.apache.hadoop.hdfs.util.GSet: 2% max
> memory = 27.3075 MB
> 2013-09-30 07:28:43,012 INFO org.apache.hadoop.hdfs.util.GSet: capacity
>    = 2^22 = 4194304 entries
> 2013-09-30 07:28:43,012 INFO org.apache.hadoop.hdfs.util.GSet:
> recommended=4194304, actual=4194304
> 2013-09-30 07:28:43,084 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner=ubuntu
> 2013-09-30 07:28:43,084 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroup=supergroup
> 2013-09-30 07:28:43,084 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
> isPermissionEnabled=true
> 2013-09-30 07:28:43,119 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
> dfs.block.invalidate.limit=100
> 2013-09-30 07:28:43,119 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
> isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s),
> accessTokenLifetime=0 min(s)
> 2013-09-30 07:28:43,183 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Registered
> FSNamesystemStateMBean and NameNodeMXBean
> 2013-09-30 07:28:43,207 INFO
> org.apache.hadoop.hdfs.server.namenode.NameNode: Caching file names
> occuring more than 10 times
> 2013-09-30 07:28:43,221 INFO org.apache.hadoop.hdfs.server.common.Storage:
> Number of files = 528665
> 2013-09-30 07:28:49,109 INFO org.apache.hadoop.hdfs.server.common.Storage:
> Number of files under construction = 7
> 2013-09-30 07:28:49,111 INFO org.apache.hadoop.hdfs.server.common.Storage:
> Image file of size 79872266 loaded in 5 seconds.
> 2013-09-30 07:28:49,113 ERROR
> org.apache.hadoop.hdfs.server.namenode.NameNode:
> java.lang.NullPointerException
>         at
> org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1099)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1111)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSDirectory.addNode(FSDirectory.java:1014)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedAddFile(FSDirectory.java:208)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.loadFSEdits(FSEditLog.java:631)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1021)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:839)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:377)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:100)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:388)
>         at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:362)
>         at
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:276)
>         at
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:496)
>         at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1279)
>         at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1288)
>
> 2013-09-30 07:28:49,114 INFO
> org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:
>
>
> --
> RAVI SHETYE
>



-- 
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With Best Regards
Manoj Kumar Sahu
Cloudwick Technologies
Hyderabad-500016.
8374232928 /7842496524
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