Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/3912
Yes, there is a tradeoff, and probably the nicest way would be to restore
the internal array size as it was when we serialized the original. However, I
guess that is too much effort for the effect. Since the sweetspot also depends
on the access pattern, I think everything from +1 to some percentage could be
justified and as there is no clear "best strategy" I would leave this up to
your judgment call.
+1 from me then.
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