${jobTracker} ${nameNode} mapred.reduce.tasks 1 mapred.mapper.class org.apache.hadoop.examples.SleepJob mapred.reducer.class org.apache.hadoop.examples.SleepJob mapred.mapoutput.key.class org.apache.hadoop.io.IntWritable mapred.mapoutput.value.class org.apache.hadoop.io.NullWritable mapred.output.format.class org.apache.hadoop.mapred.lib.NullOutputFormat mapred.input.format.class org.apache.hadoop.examples.SleepJob$SleepInputFormat mapred.partitioner.class org.apache.hadoop.examples.SleepJob mapred.speculative.execution false sleep.job.map.sleep.time 0 sleep.job.reduce.sleep.time ${REDUCER_SLEEP_TIME} Action failed, error message[${wf:errorMessage(wf:lastErrorNode())}]