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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-8262) Create CacheTran that transform the input RDD by caching it
Date Thu, 25 Sep 2014 22:43:34 GMT
Xuefu Zhang created HIVE-8262:
---------------------------------

             Summary: Create CacheTran that transform the input RDD by caching it
                 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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