Github user HeartSaVioR commented on the issue:
https://github.com/apache/storm/pull/1866
@arunmahadevan @raghavgautam
To summary, this issue was not valid for 1.x and 1.0.x branch, since field
grouper and also nimbus take care of negative hashCode via using `mod`. My bad.
I'll revert them.
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