Hi Fu-Ming, Looks similar to this bug:
http://issues.apache.org/jira/browse/HDFS-686 Does this problem persist, or was it a one time occurrence? -Todd On Tue, Dec 15, 2009 at 5:42 PM, Fu-Ming Tsai <sary...@gmail.com> wrote: > Hello, all, > > I tried to execute 2 SecondaryNamenode in my env. However, one worked > fine but the other one failed. > From the log file, I found the following message. > > 2009-12-15 15:25:19,429 ERROR > org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Throwable > Exception in doCheckpoint: > 2009-12-15 15:25:19,430 ERROR > org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: > java.lang.NullPointerException > at > org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1006) > at > org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:992) > at > org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:966) > at > org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:953) > at > org.apache.hadoop.hdfs.server.namenode.FSEditLog.loadFSEdits(FSEditLog.java:696) > at > org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:992) > at > org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$CheckpointStorage.doMerge(SecondaryNameNode.java:590) > at > org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$CheckpointStorage.access$000(SecondaryNameNode.java:473) > at > org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doMerge(SecondaryNameNode.java:350) > at > org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doCheckpoint(SecondaryNameNode.java:314) > at > org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.run(SecondaryNameNode.java:225) > at java.lang.Thread.run(Thread.java:619) > > I'm not sure what it happened. Did anyone encounter this problem before?? > > > > Best regards, > Fu-Ming >
