public static long getDefaultBlockSize(final FileSystem fs, final Path path) {
    return fs.getDefaultBlockSize(path);
  }
Return the number of bytes that large input files should be optimally be split into to minimize
i/o time.
@param fs filesystem object
@return the default block size for the path's filesystem
hbase-common/src/main/java/org/apache/hadoop/hbase/util/CommonFSUtils.java