private void putData(int startRow, int numRows, byte[] qf, byte[]... families)
    throws IOException {
    putData(this.region, startRow, numRows, qf, families);
  }
For this test,the spied {@link AsyncFSWAL} can not work properly because of a Mockito defect
that can not deal with classes which have a field of an inner class. See discussions in
HBASE-15536.When we reuse the code of {@link AsyncFSWAL} for {@link FSHLog}, this test could
not work for {@link FSHLog} also.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java