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https://issues.apache.org/jira/browse/S4-30?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175704#comment-13175704
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Gianmarco De Francisci Morales commented on S4-30:
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I think that this snippet should do the trick (anyway you lose 1 bit of
information because Java does not have unsigned types and you actually don't
care about doing exact arithmetic).
It should be faster than Math.abs() (but I haven't run microbenchmarks on it).
{code}
return (int) (rv & 0x7fffffff);
{code}
> DefaultHasher hashes keys to negative number
> --------------------------------------------
>
> Key: S4-30
> URL: https://issues.apache.org/jira/browse/S4-30
> Project: Apache S4
> Issue Type: Bug
> Affects Versions: 0.4
> Environment: All - Windows and Linux
> Reporter: Quoc Nguyen
> Priority: Blocker
>
> DefaultHasher uses HashAlgorithm hashAlgorithm = HashAlgorithm.FNV1_64_HASH;
> which hashes key strings such as 118+18233, 118+17360, 118+17258, 118+18147
> and 118+18121 and many more to negative values which the DefaultPartitioner
> (int partitionId = (int) (hasher.hash(stringValue) % partitionCount);) tries
> to partition the key to incorrect partition.
> Workaround:
> None - stream has those keys, they will get dropped because the partitioner
> cannot correctly partition.
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