Github user wangyangjun commented on the pull request:
https://github.com/apache/flink/pull/1527#issuecomment-177007794
Hello @aljoscha ,
As I mentioned in last comment, I will reimplement it with [Guava
CacheBuilder](http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/cache/CacheBuilder.html).
One question is about Flink self-memory management, does CacheBuilder get
memory from Flink or JVM directly? As I understand, HeapWindowBuffer allocates
memory from Flink. Is there any data structure like cachedMap in Flink?
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