Github user revans2 commented on the issue: https://github.com/apache/storm/pull/2241 @roshannaik I found another bug in the code. For batching you are deciding to turn on or off flushing based off of the system conf, and not the topology conf. This means that I as a topology owner can turn on batching, but flushing will still be disabled. You need to use the topology conf to decide if batching is enabled.
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