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MapReduce >> mail # user >> map stucks at 99.99%

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map stucks at 99.99%

Need input from you guys,
i am looking at a critical job in production. it stucks at 99.99% in
map phrase for much longer than it used to be..

what to do to debug what is going on with those map why it is not pass through
even though tasks and task attempts saying 100% progress but there is
not finish time...

Please suggest