hadoop mapreduce经常OOM详解大数据

property
  name mapred.child.java.opts /name
  value -Xmx512m /value //默认200m
  description Java opts for the task tracker child processes. 
  The following symbol, if present, will be interpolated: @taskid@ is replaced
  by current TaskID. 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:[email protected]@.gc
 
  The configuration variable mapred.child.ulimit can be used to control the
  maximum virtual memory of the child processes.
  /description
/property

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