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
