Github user WangTaoTheTonic commented on the issue:
https://github.com/apache/flink/pull/3709
Ok i think i've got your point.
Now using WeakHashMap, we add entries when the map doesn't contain the
requested EG id, remove invalid entries when GC happens.
By adding `small 2-line branch` as you suggest, we add entries as same way
as before, but check if a entry is valid when it's accessed by a handler, and
update/remove it if it's invalid. Is it right?
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