@Override
        public boolean evaluate() throws Exception {
          try {
            HTU.verifyNumericRows(table, f, startRow, endRow, replicaId);
            return true;
          } catch (AssertionError ae) {
            return false;
          }
        }
wal replication is async, we have to wait until the replication catches up, or we timeout
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionReplicaFailover.java