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https://issues.apache.org/jira/browse/PIG-5024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15475907#comment-15475907
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liyunzhang_intel commented on PIG-5024:
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[~kexianda]: PIG-5024_6.patch is LGTM, [~xuefuz]: please help check in ,thanks
all
> add a physical operator to broadcast small RDDs
> -----------------------------------------------
>
> Key: PIG-5024
> URL: https://issues.apache.org/jira/browse/PIG-5024
> Project: Pig
> Issue Type: Sub-task
> Components: spark
> Reporter: Xianda Ke
> Assignee: Xianda Ke
> Fix For: spark-branch
>
> Attachments: PIG-5024.patch, PIG-5024_2.patch, PIG-5024_3.patch,
> PIG-5024_4.patch, PIG-5024_5.patch, PIG-5024_6.patch
>
>
> Currently, when optimize some kinds of JOIN, the indexed or sampling files
> are saved into HDFS. By setting the replication to a larger number, it serves
> as distributed cache.
> Spark's broadcast mechanism is suitable for this. It seems that we can add a
> physical operator to broadcast small RDDs.
> This will benefit the optimization of some specialized Joins, such as Skewed
> Join, Replicated Join and so on.
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