title: Kryo serialization library: is it used in production?
body: <p><a href="https://github.com/EsotericSoftware/kryo" rel="noreferrer">Kryo</a> is a very new and interesting Java serialization library, and one of the fastest in the <a href="http://code.google.com/p/thrift-protobuf-compare/wiki/Benchmarking" rel="noreferrer">thrift-protobuf</a> benchmark.  If you've used Kryo, has it already reached enough maturity to try it out in production code?</p>
  
  <p><strong>Update (10/27/2010):</strong> We're using Kryo, though not yet in production.  See my answer below for details.</p>
  
  <p><strong>Update (3/9/2011):</strong> Updating to the latest Jackson and Kryo libraries shows that Jackson's binary Smile serialization is pretty competitive.</p>