Github user HeartSaVioR commented on a diff in the pull request:
https://github.com/apache/storm/pull/1866#discussion_r97005261
--- Diff: storm-core/src/jvm/org/apache/storm/daemon/nimbus/Nimbus.java ---
@@ -3600,7 +3600,7 @@ public ComponentPageInfo getComponentPageInfo(String
topoId, String componentId,
List<Integer> tasks =
compToTasks.get(StormCommon.EVENTLOGGER_COMPONENT_ID);
tasks.sort(null);
// Find the task the events from this component route to.
- int taskIndex =
TupleUtils.listHashCode(Arrays.asList(componentId)) %
+ int taskIndex =
(TupleUtils.listHashCode(Arrays.asList(componentId)) % tasks.size() +
tasks.size()) %
--- End diff --
@arunmahadevan In 1.x branch the field grouper does care about negative
hashCode, via using [mod](https://clojuredocs.org/clojure.core/mod) instead of
[rem](https://clojuredocs.org/clojure.core/rem).
http://stackoverflow.com/a/13060774/3480122
So it turned out we missed this point while porting to Java.
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