Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/3426#issuecomment-68174427
The mapping from class structure to serialVersionUID is well defined. The
mapping from source to class structure may not be 100% since the compiler can
stick in synthetics and such.
That said adding serialVersionUID is the less conservative default. The
failure mode of forgetting to detect and update serialized form changes is
potentially silent corruption of data. The failure mode of not adding it is
getting exceptions about incompatible changes when the two versions could be
made compatible.
I advise doing this only if really necessary because it doesn't work
otherwise. It is not something to add just because .
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