Wenchen Fan created SPARK-1888:
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Summary: enhance MEMORY_AND_DISK mode by dropping blocks in
parallel
Key: SPARK-1888
URL: https://issues.apache.org/jira/browse/SPARK-1888
Project: Spark
Issue Type: Improvement
Components: Spark Core
Reporter: Wenchen Fan
Sometimes MEMORY_AND_DISK mode is slower than DISK_ONLY mode because of the
lock on IO operations(dropping blocks in memory store). As the TODO says, the
solution is: only synchronize the selecting of to-be-dropped blocks and do the
dropping in parallel. I have a quick fix in my PR:
https://github.com/apache/spark/pull/791#issuecomment-43567924
It's fragile currently but I'm working on it to make it more robust.
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