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https://reviews.apache.org/r/26181/
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Review request for hive and Xuefu Zhang.
Bugs: HIVE-8262
https://issues.apache.org/jira/browse/HIVE-8262
Repository: hive-git
Description
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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.
Diffs
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ql/src/java/org/apache/hadoop/hive/ql/exec/spark/CachedTran.java PRE-CREATION
Diff: https://reviews.apache.org/r/26181/diff/
Testing
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Thanks,
Chao Sun
