xiufeng liu wrote:
did you format the namenode before you start? try to format it and start:
1) go to HADOOP_HOME/bin
2) ./hadoop namenode -format
I format the namenode and then issue the command :
bin/start-all.sh
this results 2 of my datanodes to run properly but causes the below
exception for one datanode.
Can i know why it occurs.
Thanx
On Mon, Jan 17, 2011 at 1:43 PM, Adarsh Sharma <adarsh.sha...@orkash.com>wrote:
Dear all,
I know this a silly mistake but not able to find the reason of the
exception that causes one datanode to fail to start.
I mount /hdd2-1 of a phsical machine into this VM and start
datanode,tasktracker.
Datanode fails after few seconds.
Can someone tell me the root cause.
Below is the exception :
2011-01-17 18:01:08,199 INFO
org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG: host = hadoop7/172.16.1.8
STARTUP_MSG: args = []
STARTUP_MSG: version = 0.20.2
STARTUP_MSG: build =
https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r
911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
************************************************************/
2011-01-17 18:03:36,391 INFO org.apache.hadoop.hdfs.server.common.Storage:
java.io.IOException: No locks available
at sun.nio.ch.FileChannelImpl.lock0(Native Method)
at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:881)
at java.nio.channels.FileChannel.tryLock(FileChannel.java:962)
at
org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.tryLock(Storage.java:527)
at
org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.lock(Storage.java:505)
at
org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.analyzeStorage(Storage.java:363)
at
org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:112)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:298)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1246)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1368)
2011-01-17 18:03:36,393 ERROR
org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: No
locks available
at sun.nio.ch.FileChannelImpl.lock0(Native Method)
at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:881)
at java.nio.channels.FileChannel.tryLock(FileChannel.java:962)
at
org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.tryLock(Storage.java:527)
at
org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.lock(Storage.java:505)
at
org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.analyzeStorage(Storage.java:363)
at
org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:112)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:298)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:216)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1283)
at
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1238)
"~/project/hadoop-0.20.2/logs/hadoop-hadoop-datanode-hadoop7.log" 42L,
3141C 1,1 Top
Thanks
Adarsh
