@Override
      public void hook(int currentSize) {
        if (currentSize == expectedSize - 1) {
          try {
            flushStore(store, id++);
            timeToGetHint.set(true);
          } catch (IOException e) {
            throw new RuntimeException(e);
          }
        }
      }
Test for HBASE-3492 - Test split on empty colfam (no store files).
@throws IOException When the IO operations fail.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHStore.java