Saisai Shao created SPARK-2926: ---------------------------------- Summary: Add MR-style (merge-sort) SortShuffleReader for sort-based shuffle Key: SPARK-2926 URL: https://issues.apache.org/jira/browse/SPARK-2926 Project: Spark Issue Type: Improvement Components: Shuffle Affects Versions: 1.1.0 Reporter: Saisai Shao
Currently Spark has already integrated sort-based shuffle write, which greatly improve the IO performance and reduce the memory consumption when reducer number is very large. But for the reducer side, it still adopts the implementation of hash-based shuffle reader, which neglect the ordering attributes of map output data in some situations. Here we propose a MR style sort-merge like shuffle reader for sort-based shuffle to better improve the performance of sort-based shuffle. Working in progress code and performance test report will be posted later when some unit test bugs are fixed. Any comments would be greatly appreciated. Thanks a lot. -- This message was sent by Atlassian JIRA (v6.2#6252) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org