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HBase >> mail # user >> 0.94.2 failing regionservers

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0.94.2 failing regionservers
We recently upgraded multiple clusters to CDH 4.2, which comes with hbase
0.94.2  Since then We've seen region servers die periodically in a way I
never saw before on CDH3.

Here are the exceptions:

First I see a slew of these: http://pastebin.com/WqSwMzuZ

Then the regionserver starts closing all its regions, after throwing this
exception: http://pastebin.com/396wX3iw

This has now happened on multiple servers across multiple clusters, all cdh

Any thoughts?  During the time our NameNodes seem to be doing fine and I
don't see any issue on our datanodes either.