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HBase >> mail # user >> one of our datanodes stops working after few hours


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one of our datanodes stops working after few hours
I took a jstack (http://pastebin.com/5v6mHg3t).   After few hours, its
literally staggers to a halt and gets very very slow... Any ideas
whats its blocking on?
(main issue is that fsreads for RS get really slow when that happens).

-Jack