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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2014/09/30 07:59:34 UTC

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

     [ https://issues.apache.org/jira/browse/SPARK-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin updated SPARK-3740:
-------------------------------
    Labels: starter  (was: )

> 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
>              Labels: starter
>
> 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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