Major Description
in conf/hadoop-env.sh,
export HADOOP_CLIENT_OPTS="-Xmx512m $HADOOP_CLIENT_OPTS"
when i set HADOOP_HEAPSIZE ,and run 'hadoop jar ...', jvm args is not work.
i see, in bin/hadoop,
exec "$JAVA" $JAVA_HEAP_MAX $HADOOP_OPTS $CLASS "$@"
HADOOP_OPTS is behind JAVA_HEAP_MAX, so HADOOP_HEAPSIZE is not work.
for example i run 'HADOOP_HEAPSIZE=1024 hadoop jar ...' , the java process is 'java -Xmx1024m ... -Xmx512m...', then Xmx512m is valid， and Xmx1024m is invalid
