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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9153) Evaluate CombineHiveInputFormat versus HiveInputFormat
Date Fri, 26 Dec 2014 15:06:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14259106#comment-14259106
] 

Xuefu Zhang commented on HIVE-9153:
-----------------------------------

[~lirui], is the test failure (dml) related to your patch?

> Evaluate CombineHiveInputFormat versus HiveInputFormat
> ------------------------------------------------------
>
>                 Key: HIVE-9153
>                 URL: https://issues.apache.org/jira/browse/HIVE-9153
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Brock Noland
>            Assignee: Rui Li
>         Attachments: HIVE-9153.1-spark.patch, HIVE-9153.1-spark.patch, HIVE-9153.2.patch,
HIVE-9153.3.patch, screenshot.PNG
>
>
> The default InputFormat is {{CombineHiveInputFormat}} and thus HOS uses this. However,
Tez uses {{HiveInputFormat}}. Since tasks are relatively cheap in Spark, it might make sense
for us to use {{HiveInputFormat}} as well. We should evaluate this on a query which has many
input splits such as {{select count(\*) from store_sales where something is not null}}.



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