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HBase >> mail # user >> Region server shutting down due to HDFS error

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Region server shutting down due to HDFS error

We have region server sporadically stopping under load due supposedly to
errors writing to HDFS. Things like:

2012-03-28 00:37:11,210 WARN org.apache.hadoop.hdfs.DFSClient: Error while
java.io.IOException: All datanodes are bad. Aborting..

It's happening with a different region server and data node every time, so
it's not a problem with one specific server and there doesn't seem to be
anything really wrong with either of them. I've already increased the file
descriptor limit, datanode xceivers and data node handler count. Any idea
what can be causing these errors?
A more complete log is here: http://pastebin.com/wC90xU2x