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Posted to dev@hive.apache.org by "Xuefu Zhang (JIRA)" <ji...@apache.org> on 2014/09/26 00:45:33 UTC
[jira] [Updated] (HIVE-8262) Create CacheTran that transforms the
input RDD by caching it [Spark Branch]
[ https://issues.apache.org/jira/browse/HIVE-8262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xuefu Zhang updated HIVE-8262:
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Summary: Create CacheTran that transforms the input RDD by caching it [Spark Branch] (was: Create CacheTran that transforms the input RDD by caching it)
> 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: Sub-task
> Components: Spark
> Reporter: Xuefu Zhang
>
> 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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