Hi, http://stackoverflow.com/questions/5490805/hadoop-nullpointerexcep
try this link Thanks Manoj On Mon, Sep 30, 2013 at 1:03 PM, Ravi Shetye <[email protected]> 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 > -- * With Best Regards Manoj Kumar Sahu Cloudwick Technologies Hyderabad-500016. 8374232928 /7842496524 * Pl. *Save a tree. Please don't print this e-mail unless you really need to...*
