Hi Folks,

I have a stream application which is running out of heap space - looks like 
there might be something up with state storage.... I'm having trouble 
determining if it just needs a lot of memory or there is a memory leak.

Are there any tips/best practice for this? I've looked at heap dumps and I just 
see lot of tuples ... it's not clear which task/operator they belong to...

I'm looking at moving to use RockDB (assuming it's just memory ...) but I'd 
like to determine if there is actually a leak. It doesn't seem to have issues 
with smaller input rates.

For reference, I'm using 1.2.1 and the source is a 4 partition Kafka topic with 
some windowing etc after that...

Thanks for any pointers/advice.


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