Most likely your NFS is not configured to allow file locks. Please
enable filelocks for your NFS.
Raghu.
Shirley Cohen wrote:
Hi,
We're getting the following error when starting up hadoop on the cluster:
2008-08-01 14:42:37,334 INFO org.apache.hadoop.dfs.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG: host = node5.cube.disc.cias.utexas.edu/129.116.113.77
STARTUP_MSG: args = []
STARTUP_MSG: version = 0.16.4
STARTUP_MSG: build =
http://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.16 -r
652614; compiled by 'hadoopqa' on Fri May 2 00:18:12 UTC 2008
************************************************************/
2008-08-01 14:43:37,572 INFO org.apache.hadoop.dfs.Storage:
java.io.IOException: No locks available
at sun.nio.ch.FileChannelImpl.lock0(Native Method)
at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:822)
at java.nio.channels.FileChannel.tryLock(FileChannel.java:967)
at
org.apache.hadoop.dfs.Storage$StorageDirectory.lock(Storage.java:393)
at
org.apache.hadoop.dfs.Storage$StorageDirectory.analyzeStorage(Storage.java:278)
at
org.apache.hadoop.dfs.DataStorage.recoverTransitionRead(DataStorage.java:103)
at org.apache.hadoop.dfs.DataNode.startDataNode(DataNode.java:236)
at org.apache.hadoop.dfs.DataNode.<init>(DataNode.java:162)
at org.apache.hadoop.dfs.DataNode.makeInstance(DataNode.java:2512)
at org.apache.hadoop.dfs.DataNode.run(DataNode.java:2456)
at
org.apache.hadoop.dfs.DataNode.createDataNode(DataNode.java:2477)
at org.apache.hadoop.dfs.DataNode.main(DataNode.java:2673)
This error appears on every data node during startup. We are running
version 0.16.4 of hadoop and the hadoop dfs is NSF mounted on all the
nodes in the cluster.
Does anyone know what this error means?
Thanks,
Shirley
