Github user HeartSaVioR commented on the pull request:
https://github.com/apache/storm/pull/532#issuecomment-158761979
If there's no deadlock when _pendingWrites is bounded queue, we can just
set default value of TOPOLOGY_SHELLBOLT_MAX_PENDING to reasonable and deny set
it to null. In result ABP will work.
Btw, approach I commented before still have advantages whether there's
deadlock issue or not.
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