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Posted to dev@pig.apache.org by "Rohini Palaniswamy (JIRA)" <ji...@apache.org> on 2017/01/11 22:32:17 UTC

[jira] [Updated] (PIG-5088) HashValuePartitioner has skew when there is only map fields

     [ https://issues.apache.org/jira/browse/PIG-5088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rohini Palaniswamy updated PIG-5088:
------------------------------------
    Attachment: PIG-5088-1.patch

> HashValuePartitioner has skew when there is only map fields
> -----------------------------------------------------------
>
>                 Key: PIG-5088
>                 URL: https://issues.apache.org/jira/browse/PIG-5088
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Rohini Palaniswamy
>            Assignee: Rohini Palaniswamy
>             Fix For: 0.17.0, 0.16.1
>
>         Attachments: PIG-5088-1.patch
>
>
>   One user who just did union of map fields, got a skew with everything going to one input file as hashcode for map was calculated on the size. [~knoguchi] pointed out that my assumption of map hashcode being non-deterministic and can change with jdk versions is wrong as it just does a sum of hashcode of its entries.



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