@Override
  public int getCompressionLevel() {
    return compressionLevel != null ? compressionLevel : getDefaultCompressionLevel();
  }
Get the current compression level, set by setCompressionLevel().
If never set, it returns the default compression level.
@return The current compression level.
ambry-commons/src/main/java/com/github/ambry/compression/BaseCompressionWithLevel.java