Github user HeartSaVioR commented on a diff in the pull request:
https://github.com/apache/storm/pull/2241#discussion_r129728553
--- Diff: conf/defaults.yaml ---
@@ -231,16 +228,13 @@ 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: null # TODO: We dont need this any more
--- End diff --
I guess it utilizes blocking queue which looks natural for the definition
of back pressure. If then we need to be sure there's no livelock and deadlock.
AFAIK, Storm used blocking queue before, and ended up adding overflow buffer
because of deadlock (dining philosopher).
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