hadoop file encoding 설정
hadoop file read write 시 인코딩을 변경하는 방법
‘mapred.child.heap.size’ (If a mapred.child.heap.size value is found
in a configuration, its maximum heap size will be used and a warning
emitted that heap.size has been deprecated). Also, the following symbols,
if present, will be interpolated: @taskid@ is replaced by current TaskID;
and @port@ will be replaced by mapred.task.tracker.report.port + 1 (A second
child will fail with a port-in-use if mapred.tasktracker.tasks.maximum is
greater than one). Any other occurrences of ‘@’ will go unchanged. For
example, to enable verbose gc logging to a file named for the taskid in
/tmp and to set the heap maximum to be a gigabyte, pass a ‘value’ of:
-Xmx1024m -verbose:gc -Xloggc:/tmp/@taskid@.gc
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