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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/11/08 10:59:00 UTC
[jira] [Commented] (SPARK-22470) Doc that functions.hash is also
used internally for shuffle and bucketing
[ https://issues.apache.org/jira/browse/SPARK-22470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16243720#comment-16243720 ]
Apache Spark commented on SPARK-22470:
--------------------------------------
User 'ash211' has created a pull request for this issue:
https://github.com/apache/spark/pull/19694
> Doc that functions.hash is also used internally for shuffle and bucketing
> -------------------------------------------------------------------------
>
> Key: SPARK-22470
> URL: https://issues.apache.org/jira/browse/SPARK-22470
> Project: Spark
> Issue Type: Documentation
> Components: Documentation, SQL
> Affects Versions: 2.2.0
> Reporter: Andrew Ash
>
> https://issues.apache.org/jira/browse/SPARK-12480 added a hash function that appears to be the same hash function as what Spark uses internally for shuffle and bucketing.
> One of my users would like to bake this assumption into code, but is unsure if it's a guarantee or a coincidence that they're the same function. Would it be considered an API break if at some point the two functions were different, or if the implementation of both changed together?
> We should add a line to the scaladoc to clarify.
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