Previously env variable HADOOP_CLASSPAH in MR containers inherit from defaults of the worker node.
MAPREDUCE-6454 introduced change to overwrite HADOOP_CLASSPATH completely. This caused regression. We need to add additional entries to HADOOP_CLASSPATH instead of completely replacing it.
- is related to
MAPREDUCE-6454 MapReduce doesn't set the HADOOP_CLASSPATH for jar lib in distributed cache.