Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/1208#issuecomment-145017991
The description of Evictors for the keyed windows are a little bit messy,
what gets evicted from where. There is also some conflict with the example and
the description: "Retain 1000 elements from the end of the window backwards,
evicting all others." vs "and every time execution is triggered, 10 elements
are removed from the window".
As far as I understand triggers and evictors work with the same semantics
as now, but there is always a fix time trigger/eviction determined by the
window assigner.
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