HBASE-26340 - fix RegionSizeCalculator getLEngth to bytes instead of converting from MB

Author: nkalmar

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/RegionSizeCalculator.java

@@ -52,7 +52,6 @@ public class RegionSizeCalculator {
   private final Map<byte[], Long> sizeMap = new TreeMap<>(Bytes.BYTES_COMPARATOR);
 
   static final String ENABLE_REGIONSIZECALCULATOR = "hbase.regionsizecalculator.enable";
-  private static final long MEGABYTE = 1024L * 1024L;
 
   /**
    * Computes size of each region for table and given column families.
@@ -84,7 +83,7 @@ private void init(RegionLocator regionLocator, Admin admin)
 
         byte[] regionId = regionLoad.getRegionName();
         long regionSizeBytes
-          = ((long) regionLoad.getStoreFileSize().get(Size.Unit.MEGABYTE)) * MEGABYTE;
+          = (long)regionLoad.getStoreFileSize().get(Size.Unit.BYTE);
 
         sizeMap.put(regionId, regionSizeBytes);