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Posted to dev@storm.apache.org by "James Xu (JIRA)" <ji...@apache.org> on 2013/12/15 07:06:06 UTC

[jira] [Created] (STORM-139) hashCode does not work for byte[]

James Xu created STORM-139:
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             Summary: hashCode does not work for byte[]
                 Key: STORM-139
                 URL: https://issues.apache.org/jira/browse/STORM-139
             Project: Apache Storm (Incubating)
          Issue Type: Bug
            Reporter: James Xu
            Priority: Minor


https://github.com/nathanmarz/storm/issues/245

Storm should use a different hashCode method when getting the hash for a byte[] array, since the default one uses the object identity. Should check the behavior on other arrays as well

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xiaokang: I tested byte[] and other arrays. The hashCode of array is the array object identity.

I alse tested that java.util.Arrays.hashCode(xx[]) is based of the array element's hash code. It maybe ok change the list-hash-code function of tuple.clj to fix the problem.

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Sirwellington: you may want to read this:
http://martin.kleppmann.com/2012/06/18/java-hashcode-unsafe-for-distributed-systems.html




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