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