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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-9574) Lazy computing in HiveBaseFunctionResultList may hurt performance [Spark Branch]
Date Fri, 06 Feb 2015 22:46:34 GMT

     [ https://issues.apache.org/jira/browse/HIVE-9574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jimmy Xiang updated HIVE-9574:
------------------------------
    Attachment: HIVE-9574.2-spark.patch

Attached v2 that removed aboutToSpill(). Discussed it with Szehon and Chao, it seems there
is no need to wait till the cache/buffer is full.

> Lazy computing in HiveBaseFunctionResultList may hurt performance [Spark Branch]
> --------------------------------------------------------------------------------
>
>                 Key: HIVE-9574
>                 URL: https://issues.apache.org/jira/browse/HIVE-9574
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Rui Li
>            Assignee: Jimmy Xiang
>             Fix For: spark-branch
>
>         Attachments: HIVE-9574.1-spark.patch, HIVE-9574.2-spark.patch
>
>
> {{RowContainer.first}} may call {{InputFormat.getSplits}}, which is expensive. If we
switch {{container}} and {{backupContainer}} frequently in {{HiveKVResultCache}}, it will
downgrade performance.



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