/**
* Returns the daughter regions by reading from the corresponding columns of the .META. table
* Result. If the region is not a split parent region, it returns PairOfSameType(null, null).
*/
public static PairOfSameType<HRegionInfo> getDaughterRegions(Result data) throws IOException {
HRegionInfo splitA =
Writables.getHRegionInfoOrNull(
data.getValue(HConstants.CATALOG_FAMILY, HConstants.SPLITA_QUALIFIER));
HRegionInfo splitB =
Writables.getHRegionInfoOrNull(
data.getValue(HConstants.CATALOG_FAMILY, HConstants.SPLITB_QUALIFIER));
return new PairOfSameType<HRegionInfo>(splitA, splitB);
}
/**
* Parse the content of the cell at {@link HConstants#CATALOG_FAMILY} and <code>qualifier</code>
* as an HRegionInfo and return it, or null. For use on catalog table {@link Result}.
*
* @param r Result instance to pull from.
* @param qualifier Column family qualifier -- either {@link HConstants#SPLITA_QUALIFIER}, {@link
* HConstants#SPLITB_QUALIFIER} or {@link HConstants#REGIONINFO_QUALIFIER}.
* @return An HRegionInfo instance or null.
* @throws IOException
*/
public static HRegionInfo parseHRegionInfoFromCatalogResult(final Result r, byte[] qualifier)
throws IOException {
byte[] bytes = r.getValue(HConstants.CATALOG_FAMILY, qualifier);
if (bytes == null || bytes.length <= 0) return null;
return Writables.getHRegionInfoOrNull(bytes);
}