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Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2016/03/05 09:20:41 UTC

[jira] [Reopened] (SPARK-13523) Reuse the exchanges in a query

     [ https://issues.apache.org/jira/browse/SPARK-13523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davies Liu reopened SPARK-13523:
--------------------------------

SPARK-11838 is different than this, that is about cache fragment across queries.

> Reuse the exchanges in a query
> ------------------------------
>
>                 Key: SPARK-13523
>                 URL: https://issues.apache.org/jira/browse/SPARK-13523
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>            Reporter: Davies Liu
>
> In exchange, the RDD will be materialized (shuffled or collected), it's a good point to eliminate common part of a query.
> In some TPCDS queries (for example, Q64), the same exchange (ShuffleExchange or BroadcastExchange) could be used multiple times, we should re-use them to avoid the duplicated work and reduce the memory for broadcast.



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