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reg memory allocation failed

I am getting this issue when reducer starts executing after map's
completed. After job failed with below exception when i restart its running
We are getting this issue after upgrading to MRv1(CDH4).

Any inputs will be more helpful, Thanks in advance.

# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 32 bytes for
# An error report file with more information is saved as: