I see endless spew in the log files of the form
2008-03-11 20:40:45,379 INFO org.apache.hadoop.dfs.DataNode: Datanode 0
forwarding connect ack to upstream firstbadlink is
2008-03-11 20:40:45,172 INFO org.apache.hadoop.dfs.DataNode: Received
block blk_3082015406379486032 of size 7913915 from /10.50.80.95
2008-03-11 20:40:45,172 INFO org.apache.hadoop.dfs.DataNode:
PacketResponder 1 for block blk_3082015406379486032 terminating
2008-03-11 20:40:45,263 INFO org.apache.hadoop.dfs.DataNode: Received
block blk_-7497781654408265731 of size 25156578 from /10.50.80.95
2008-03-11 20:40:45,263 INFO org.apache.hadoop.dfs.DataNode:
PacketResponder 1 for block blk_-7497781654408265731 terminating
while eventually the map tasks get killed for not responding for 600
seconds.
