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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2014/09/30 07:59:33 UTC

[jira] [Created] (SPARK-3740) Use a compressed bitmap to track zero sized blocks in HighlyCompressedMapStatus

Reynold Xin created SPARK-3740:
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             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



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