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From "Xuefu Zhang (JIRA)" <>
Subject [jira] [Commented] (HIVE-8810) Make HashTableSinkOperator works for Spark Branch [Spark Branch]
Date Thu, 13 Nov 2014 19:33:34 GMT


Xuefu Zhang commented on HIVE-8810:

+1, Patch looks good. Only one ignorable comments on RB.

> Make HashTableSinkOperator works for Spark Branch [Spark Branch]
> ----------------------------------------------------------------
>                 Key: HIVE-8810
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Chao
>            Assignee: Jimmy Xiang
>         Attachments: HIVE-8810.1-spark.patch, HIVE-8810.2-spark.patch, HIVE-8810.3-spark.patch
> In MR, all small tables for a particular MJ operator share the same instance of {{HashTableSinkOperator}},
while in Spark branch, each small table corresponds to a different {{HashTableSinkOperator}}
instance. This difference causes some issues.
> For instance, in {{HashTableSinkOperator#processOp}}, it uses a tag to look for information
in various data structures, such as {{joinKeys}}, {{filterMaps}}, {{joinValues}}, etc. Those
data structures stores the information BEFORE it splits the MJ operator with its parents.
But, since later on we use separate {{HashTableSinkOperator}} for each small table, that information
is no longer valid, and thus this method will fail.
> This JIRA is to track and solve these related issues.

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