The gryo format has seen some change since we first went to GA but all changes have been done in a backward compatible way such that a file created with 3.0.0 could be read by all versions up to 3.1.1. Given what we've seen of usage, we've accumulated a number of tickets that would improve gryo's efficiency and fix some problems. You can catch up on what these tickets are here:
https://issues.apache.org/jira/browse/TINKERPOP-1182 https://issues.apache.org/jira/browse/TINKERPOP-1122 https://issues.apache.org/jira/browse/TINKERPOP-1128 Of course, implementing these tickets would introduce a breaking change if we were to just implement them in the current version of gryo. Rather than introduce a break I think we just need to stamp out a new version of gryo that will no longer be compatible with the previous version. It would also be nice to get this ticket in place in the process https://issues.apache.org/jira/browse/TINKERPOP-1130 which proposes maintaining IO compatibility across versions and validating that compatibility with tests, Anyway, I think this is something that might be best done for 3.2.0 even though it likely shouldn't bring any breaks with it. Any thoughts/concerns?
