Github user jsirois commented on the pull request:
https://github.com/apache/thrift/pull/448#issuecomment-183458933
My 2 nonbinding cents: No reasonable client should care about hashCode
values, only that the values meet the hashCode contract (this is true of any
language). I don't think preserving them should ever be a goal.
A second comment, not as helpful since it requires work, is that we should
enshrine perf improvements using a tool like
[jmh](http://openjdk.java.net/projects/code-tools/jmh/). We use this in
[Apache
Aurora](https://github.com/apache/aurora/tree/master/src/jmh/java/org/apache/aurora/benchmark)
for example to ensure we have a shared history of performance improvements and
regressions.
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