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From daniel sikar <dsi...@gmail.com>
Subject Re: namenode doesn't start after reboot
Date Wed, 22 Dec 2010 18:01:42 GMT
I can't help but with hindsight - it's advisable to snapshot your
namenodes as HDFS dies with them.

On 22 December 2010 15:03, Bjoern Schiessle <bjoern@schiessle.org> wrote:
> Hi,
>
> After a Kernel update and a reboot the namenode doesn't start. I run the
> Cloudera cdh3 Hadoop distribution. I have already searched for a solution.
> It looks like I'm not the only one with such a problem. Sadly I could only
> find descriptions of similar problems, but no solutions...
>
> This is the error message from the namenode log file:
>
>
> 2010-12-22 16:13:04,830 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: STARTUP_MSG:
> /************************************************************
> STARTUP_MSG: Starting NameNode
> STARTUP_MSG:   host = pcube/129.69.216.24
> STARTUP_MSG:   args = []
> STARTUP_MSG:   version = 0.20.2+737
> STARTUP_MSG:   build =  -r 98c55c28258aa6f42250569bd7fa431ac657bdbd; compiled by 'root'
on Mon Oct 11 17:21:30 UTC 2010
> ************************************************************/
> 2010-12-22 16:13:05,001 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM
Metrics with processName=NameNode, sessionId=null
> 2010-12-22 16:13:05,007 INFO org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics:
Initializing NameNodeMeterics using context object:org.apache.hadoop.metrics.spi.NullContext
> 2010-12-22 16:13:05,036 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner=hdfs
> 2010-12-22 16:13:05,036 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroup=supergroup
> 2010-12-22 16:13:05,036 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isPermissionEnabled=false
> 2010-12-22 16:13:05,040 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isAccessTokenEnabled=false
accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
> 2010-12-22 16:13:05,335 INFO org.apache.hadoop.hdfs.server.namenode.metrics.FSNamesystemMetrics:
Initializing FSNamesystemMetrics using context object:org.apache.hadoop.metrics.spi.NullContext
> 2010-12-22 16:13:05,336 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Registered
FSNamesystemStatusMBean
> 2010-12-22 16:13:05,361 INFO org.apache.hadoop.hdfs.server.common.Storage: Number of
files = 72
> 2010-12-22 16:13:05,374 INFO org.apache.hadoop.hdfs.server.common.Storage: Number of
files under construction = 3
> 2010-12-22 16:13:05,375 INFO org.apache.hadoop.hdfs.server.common.Storage: Image file
of size 8822 loaded in 0 seconds.
> 2010-12-22 16:13:05,377 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.lang.NullPointerException
>        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1088)
>        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1100)
>        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addNode(FSDirectory.java:1003)
>        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedAddFile(FSDirectory.java:206)
>        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.loadFSEdits(FSEditLog.java:637)
>        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1034)
>        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:845)
>        at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:379)
>        at org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:99)
>        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:343)
>        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:317)
>        at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:214)
>        at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:394)
>        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1148)
>        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1157)
>
> 2010-12-22 16:13:05,377 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:
> /************************************************************
> SHUTDOWN_MSG: Shutting down NameNode at pcube/129.69.216.24
> ************************************************************/
>
> Any idea what could be wrong and how I can get my namenode up running again?
>
> Thanks a lot!
> Björn
>

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