default long getWriteBufferSize() {
    throw new UnsupportedOperationException(
      "The BufferedMutator::getWriteBufferSize has not been implemented");
  }
Returns the maximum size in bytes of the write buffer for this HTable.
<p>
The default value comes from the configuration parameter {@code hbase.client.write.buffer}.
@return The size of the write buffer in bytes.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/BufferedMutator.java