Github user cestella commented on the issue:
https://github.com/apache/metron/pull/940
The interesting thing that we found was that guava seems to be doing poorly
when the # of items in the cache gets large. When we scaled the test down (830
distinct IP addresses chosen randomly and sent in at a rate of 200k events per
second with a cache size of 100) kept up but scaling the test up (300k distinct
ip addresses chosen randomly and sent in at a rate of 200k events per second
with a cache size of 100k) didn't.
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