Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/2241#discussion_r135689031
--- Diff: conf/defaults.yaml ---
@@ -231,20 +234,35 @@ topology.multilang.serializer:
"org.apache.storm.multilang.JsonSerializer"
topology.shellbolt.max.pending: 100
topology.skip.missing.kryo.registrations: false
topology.max.task.parallelism: null
-topology.max.spout.pending: null
+topology.max.spout.pending: 995 # Used in ACK mode only. Should be less
than `topology.executor.receive.buffer.size` to avoid deadlocked cycles
involving ACKer
--- End diff --
Do we need this since we addressed the netty unbounded buffering? Its a
pain to tune multiple parameters to achieve back-pressure and right now
max.spout.pending also needs to be tuned to get application logic like
windowing to work correctly. IMO, we can try to get rid of this config if
possible.
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