Thanks for your help, Todd, It happens whenever I restart SecondaryNamenode.
But what I'm curious is why the other host can work fine. Did you encounter this problem? Best regards, Fu-Ming On Thu, Dec 17, 2009 at 12:59 AM, Todd Lipcon <[email protected]> wrote: > 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 <[email protected]> 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 >> > -- ------------------------------------ "Losers always whine about their best." Fu-Ming Tsai [email protected] ------------------------------------
