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https://issues.apache.org/jira/browse/HIVE-8262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuefu Zhang updated HIVE-8262:
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Issue Type: Task (was: Sub-task)
Parent: (was: HIVE-7292)
> Create CacheTran that transforms the input RDD by caching it [Spark Branch]
> ---------------------------------------------------------------------------
>
> Key: HIVE-8262
> URL: https://issues.apache.org/jira/browse/HIVE-8262
> Project: Hive
> Issue Type: Task
> Components: Spark
> Reporter: Xuefu Zhang
> Assignee: Chao
>
> In a few cases we need to cache a RDD to avoid recompute it for better
> performance. However, caching a map input RDD is different from caching a
> regular RDD due to SPARK-3693. The way to cache a Hadoop RDD, which is the
> input to MapWork, is to cache, the result RDD that is transformed from the
> original Hadoop RDD by applying a map function, in which <key, value> pairs
> are copied. To cache intermediate RDDs, such as that from a shuffle, is just
> calling .cache().
> This task is to create a CacheTran to capture this, which can be used to plug
> in Spark Plan when caching is desirable.
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