public void returnDecompressor(Decompressor decompressor) {
      if (decompressor != null) {
        if (LOG.isTraceEnabled()) LOG.trace("Returning decompressor " + decompressor + " to pool.");
        CodecPool.returnDecompressor(decompressor);
        if (decompressor.getClass().isAnnotationPresent(DoNotPool.class)) {
          if (LOG.isTraceEnabled()) LOG.trace("Ending decompressor " + decompressor);
          decompressor.end();
        }
      }
    }
Creates a compression stream without any additional wrapping into buffering streams.
hbase-common/src/main/java/org/apache/hadoop/hbase/io/compress/Compression.java