[HIVE-8843] Release RDD cache when Hive query is done [Spark Branch]

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Component/s: Spark
• Assignee: Jimmy Xiang
• Reporter: Xuefu Zhang
• Created: 12/Nov/14 19:02
• Updated: 29/May/15 02:32
• Resolved: 17/Dec/14 20:56

Description

In some multi-inser cases, RDD.cache() is called to improve performance. RDD is SparkContext specific, but the caching is useful only for the query. Thus, once the query is executed, we need to release the cache used by calling RDD.uncache().