bipinprasad opened a new pull request #3391: URL: https://github.com/apache/storm/pull/3391
## What is the purpose of the change *While backtracking in scheduling code, Ackers are skipped. However, under certain circumstances a null WorkerSlot is passed as parameter to SchedulingSearcherState.backtrack(). This null key is used to retrieve an entry from Map. The returned null map value causes NPE* ## How was the change tested *new unit test TestGenericResourceAwareStrategy.testScheduleLeftOverAckers()* -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
