private static void removeField(Kryo kryo, Class type, String fieldName) {
    FieldSerializer fld = new FieldSerializer(kryo, type);
    fld.removeField(fieldName);
    kryo.register(type, fld);
  }
Release kryo instance back to the pool.

@param kryo - kryo instance to be released
ql/src/java/org/apache/hadoop/hive/ql/exec/SerializationUtilities.java