We use 3 cluster machines, and the mapreduce.tasktracker.reduce.tasks.maximum property is set to 9. When I set no reducers equal to or less than 9, the result becomes successful, but if I set the value to more than 9, it does not work with the exception: "The task try_201701270751_0001_r_000000_0 was unable to ping TT within 60 seconds. Kill!". Can someone explain to me what the problem is?
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