Xuefu Zhang created HIVE-8262:
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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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