Github user arunmahadevan commented on the issue:
https://github.com/apache/storm/pull/1470
@kosii the delete api is useful. Lets also try to see if we could handle
the deletes by maintaining an entry within the pendingPrepare itself and avoid
the extra hashsets and synchronized as mentioned in
https://github.com/apache/storm/pull/1470/files#r66784961
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