Graceful handling of "close" in WritableByteChannelAdapter

org.apache.hadoop.hive.llap.WritableByteChannelAdapter

"I see now that the writeListener could be implemented in such a way as to propagate a write error back to the writer (so we can possibly throw an exception and fail the current operation rather than just log and ignore the error). Plus on close I'm wondering if it is better just to wait for the close future to complete so we can check the status."