FAQ
Hi Sam,

Apologies for the inconvenience that this caused you. This will be fixed in
the next release of CM.

-Vinithra
On Mon, Jun 18, 2012 at 10:11 AM, Sam Darwin wrote:

I will put the answer and the question in reverse order.

ANSWER: Modify dfs.datanode.du.reserved to be 100MB instead of
10GB, for each datanode. Search in the cloudera GUI, and you will
find this value which is usually set to 10GB. Change each datanode,
save, and restart.

And to Cloudera: please make this change 'dynamically' during
installation, or something, for goodness sakes. :-) what a
mess.

QUESTION: Why do I get all these terrible errors when I try to
test on Amazon EC2 micro instances?

It is not obvious what is causing them... Everything appears to be
running ok.

12/06/18 11:46:27 WARN hdfs.DFSClient: DataStreamer Exception:
org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /tmp/
test.txt

could only be replicated to 0 nodes, instead of 1


12/06/18 11:46:27 WARN hdfs.DFSClient: Error Recovery for block null
bad datanode[0] nodes == null
12/06/18 11:46:27 WARN hdfs.DFSClient: Could not get block locations.
Source file "/tmp/test.txt" - Aborting...
put: java.io.IOException: File /tmp/test.txt could only be replicated
to 0 nodes, instead of 1
12/06/18 11:46:27 ERROR hdfs.DFSClient: Exception closing file /tmp/
test.txt : org.apache.hadoop.ipc.RemoteException: java.io.IOException:
File

/tmp/test.txt could only be replicated to 0 nodes, instead of 1

2012-06-18 11:44:27,757 ERROR
org.apache.hadoop.security.UserGroupInformation:
PriviledgedActionException as:hbase (auth:SIMPLE)

cause:java.io.IOException: File /hbase/hbase.version could only be
replicated to 0 nodes, instead of 1
error: java.io.IOException: File /hbase/hbase.version could only be
replicated to 0 nodes, instead of 1

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