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From "Xiao Li (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SPARK-11055) Use mixing hash-based and sort-based aggregation in TungstenAggregationIterator
Date Sat, 08 Oct 2016 20:57:20 GMT

     [ https://issues.apache.org/jira/browse/SPARK-11055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Li closed SPARK-11055.
---------------------------
    Resolution: Duplicate

> Use mixing hash-based and sort-based aggregation in TungstenAggregationIterator
> -------------------------------------------------------------------------------
>
>                 Key: SPARK-11055
>                 URL: https://issues.apache.org/jira/browse/SPARK-11055
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Liang-Chi Hsieh
>
> In TungstenAggregationIterator we switch to sort-based aggregation when we can't allocate
more memory for hashmap.
> However, using external sorter-based aggregation will write too much key-value pairs
into disk. We should use mixing hash-based and sort-based aggregation to reduce the key-value
pairs needed to write to disk.



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