Reynold Xin created SPARK-3740: ---------------------------------- Summary: Use a compressed bitmap to track zero sized blocks in HighlyCompressedMapStatus Key: SPARK-3740 URL: https://issues.apache.org/jira/browse/SPARK-3740 Project: Spark Issue Type: Improvement Components: Shuffle, Spark Core Reporter: Reynold Xin
HighlyCompressedMapStatus uses a single long to track the average block size. However, if a stage has a lot of zero sized outputs, this leads to inefficiency because executors would need to send requests to fetch zero sized blocks. We can use a compressed bitmap to track the zero-sized blocks. See discussion in https://github.com/apache/spark/pull/2470 -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org