Github user ctubbsii commented on the issue:
https://github.com/apache/accumulo/pull/292
This whole thing might be easier to implement with
[`CacheBuilder.weakValues()`][1] from Guava. Eviction seems to occur if value
disappears. I **think** this will do what we want, and it should automatically
hide the WeakReference stuff from us, auto-evicting stuff when the value is
gone so we never see it as present in the map. The key can be String, without
the need to do any crazy `new String` stuff, or early construction. It ensures
a dependency on Guava, though.
[1]:
https://google.github.io/guava/releases/16.0/api/docs/com/google/common/cache/CacheBuilder.html#weakValues()
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