Github user zhuoliu commented on a diff in the pull request:
https://github.com/apache/storm/pull/933#discussion_r47592998
--- Diff: conf/defaults.yaml ---
@@ -179,7 +179,7 @@ task.refresh.poll.secs: 10
task.credentials.poll.secs: 30
# now should be null by default
-topology.backpressure.enable: true
+topology.backpressure.enable: false
backpressure.disruptor.high.watermark: 0.9
backpressure.disruptor.low.watermark: 0.4
--- End diff --
This low/high watermark default values are now more of empirical values
based on a limited set of topologies. We may need more experiments and
theoretical analysis (based on representative queue draining speed, callback
response time etc.) for choices of these watermark percentages.
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