local variable of hdfsBlock
fix missing space
check maxSplit size must be greater or equal to minSplitSize
maxSplitSize should always be positive
separate out getParquetInputSplit method in the SplitInfo class, reduce LOC in the generateSplit method
move parseMessageType out of the loop
1. remove unused readSupportClass parameter from generateSplit method; 2. double check split min max to be postive in the getSplits method; 3. explicit import java.util.xx in test