@Override
      public FSDataInputStream open(Path p) throws IOException {
        InputStreamProxy is = new InputStreamProxy(super.open(p));
        openedReaders.add(is);
        return is;
      }
Confirm that we will use different WALs for hbase:meta and hbase:replication
hbase-server/src/test/java/org/apache/hadoop/hbase/wal/TestWALFactory.java