Fix HashPartitioner's negative result #709
Merged
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Issue: I have found that for some Key, the Partition function of HashPartitioner return negative value. After I investigate the issue, I have found that if the fnv's Sum32 function returns 2147483648, which is -2147483648 in int32 and the negative of this will still be -2147483648 causing the negative result returned.
Reproduce: this issue can be reproduced by using "1468509572224" as message's key.
Change:
Please feel free to suggest the better way to fix this issue.