Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1764#discussion_r90538639
--- Diff: storm-core/src/clj/org/apache/storm/daemon/nimbus.clj ---
@@ -1008,23 +1008,24 @@
(reset! (:id->worker-resources nimbus) {}))
;; tasks figure out what tasks to talk to by looking at topology at
runtime
;; only log/set when there's been a change to the assignment
- (doseq [[topology-id assignment] new-assignments
- :let [existing-assignment (get existing-assignments
topology-id)
- topology-details (.getById topologies topology-id)]]
- (if (= existing-assignment assignment)
- (log-debug "Assignment for " topology-id " hasn't changed")
- (do
- (log-message "Setting new assignment for topology id "
topology-id ": " (pr-str assignment))
- (.setAssignment storm-cluster-state topology-id
(thriftify-assignment assignment))
- )))
- (->> new-assignments
- (map (fn [[topology-id assignment]]
- (let [existing-assignment (get existing-assignments
topology-id)]
- [topology-id (map to-worker-slot (newly-added-slots
existing-assignment assignment))]
- )))
- (into {})
- (.assignSlots inimbus topologies)))
- (log-message "not a leader, skipping assignments")))
+ (locking (:sched-lock nimbus)
--- End diff --
@jerrypeng You are correct that this could happen. I don't really think it
will be that likely to happen in practice but I'll think about it and see if we
can fix it.
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