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https://issues.apache.org/jira/browse/HIVE-9153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brock Noland updated HIVE-9153:
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Description: 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}}. (was: 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}}.)
> Evaluate CombineHiveInputFormat versus HiveInputFormat [Spark Branch]
> ---------------------------------------------------------------------
>
> Key: HIVE-9153
> URL: https://issues.apache.org/jira/browse/HIVE-9153
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Affects Versions: spark-branch
> Reporter: Brock Noland
> Assignee: Rui Li
>
> 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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