@Override
      public CompressionCodec reload(Configuration conf) {
        synchronized (lock) {
          lzoCodec = buildCodec(conf, this);
          LOG.warn("Reloaded configuration for {}", name());
          return lzoCodec;
        }
      }
Compression algorithms. The ordinal of these cannot change or else you risk breaking all
existing HFiles out there. Even the ones that are not compressed! (They use the NONE algorithm)
hbase-common/src/main/java/org/apache/hadoop/hbase/io/compress/Compression.java