Ran sort benchmark couple of times and every time the job got hang after completion 99% map phase. There are some map tasks failed. Also it's not scheduled some of the pending map tasks.
Cluster size is 350 nodes.
Compiled: Fri Dec 9 16:25:27 PST 2011 by someone from branches/branch-0.23/hadoop-common-project/hadoop-common
ResourceManager version: revision 1212681 by someone source checksum on Fri Dec 9 16:52:07 PST 2011
Hadoop version: revision 1212592 by someone Fri Dec 9 16:25:27 PST 2011