Github user HeartSaVioR commented on a diff in the pull request: https://github.com/apache/storm/pull/521#discussion_r30513365 --- Diff: storm-core/src/clj/backtype/storm/daemon/worker.clj --- @@ -139,12 +139,12 @@ (.add local pair) ;;Using java objects directly to avoid performance issues in java code - (let [node+port (get @task->node+port task)] - (when (not (.get remoteMap node+port)) - (.put remoteMap node+port (ArrayList.))) - (let [remote (.get remoteMap node+port)] + (let [] + (when (not (.get remoteMap task)) + (.put remoteMap task (ArrayList.))) + (let [remote (.get remoteMap task)] (.add remote (TaskMessage. task (.serialize serializer tuple))) - )))) + )))) --- End diff -- @d2r Accessing task->node+port from these lines is root of this problem since it can be changed during preparing for transfer. So we should change current implementation to not accessing task->node+port. It should be grouped by destination (node and port) within read lock.
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