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Posted to issues@spark.apache.org by "Yin Huai (JIRA)" <ji...@apache.org> on 2015/07/22 06:51:04 UTC

[jira] [Updated] (SPARK-9240) Hybrid aggregate operator using unsafe row

     [ https://issues.apache.org/jira/browse/SPARK-9240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yin Huai updated SPARK-9240:
----------------------------
    Summary: Hybrid aggregate operator using unsafe row  (was: Hybrid aggregate operator)

> Hybrid aggregate operator using unsafe row
> ------------------------------------------
>
>                 Key: SPARK-9240
>                 URL: https://issues.apache.org/jira/browse/SPARK-9240
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Yin Huai
>            Priority: Blocker
>
> We need a hybrid aggregate operator, which first tries hash-based aggregations and gracefully switch to sort-based aggregations if the hash map's memory footprint exceeds a given threshold (how to track memory footprint and how to set the threshold?).



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