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https://issues.apache.org/jira/browse/YARN-297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546159#comment-13546159
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Radim Kolar commented on YARN-297:
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bigger numbers will give hashCodes larger spread and it will less likely to
generate collision if you sum hashCodes.
look at source code for java.lang.ThreadLocal
> Improve hashCode implementations for PB records
> -----------------------------------------------
>
> Key: YARN-297
> URL: https://issues.apache.org/jira/browse/YARN-297
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Arun C Murthy
> Assignee: Xuan Gong
> Attachments: YARN.297.1.patch
>
>
> As [~hsn] pointed out in YARN-2, we use very small primes in all our hashCode
> implementations.
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