[jira] [Assigned] (HIVE-8840) Print prettier Spark work graph after HIVE-8793 [Spark Branch]

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-8840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jimmy Xiang reassigned HIVE-8840:
---------------------------------

    Assignee: Jimmy Xiang

> Print prettier Spark work graph after HIVE-8793 [Spark Branch]
> --------------------------------------------------------------
>
>                 Key: HIVE-8840
>                 URL: https://issues.apache.org/jira/browse/HIVE-8840
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Jimmy Xiang
>
> Because of HIVE-8793, the work graph for Spark is possibly modified by SplitSparkWorkResolver.  Original:
> {code}
>     Spark
>       Edges:
>         Reducer 2 <- Map 1 (SORT, 1)
>         Reducer 3 <- Reducer 2 (GROUP, 1)
>          Reducer 4 <- Reducer 2 (GROUP, 1)
> {code}
> New graph
> {code}
>     Spark
>       Edges:
>         Reducer 3 <- Reducer 5 (GROUP, 1)
>         Reducer 4 <- Reducer 6 (GROUP, 1)
>         Reducer 5 <- Map 1 (SORT, 1)
>         Reducer 6 <- Map 1 (SORT, 1)
> {code}
> where Reducer2 was splitted into Reducer5 and Reducer6.
> Two types of ordering can be considered:
> 1. Topological order
> {code}
>     Spark
>       Edges:
>         Reducer 5 <- Map 1 (SORT, 1)
>         Reducer 6 <- Map 1 (SORT, 1)
>         Reducer 3 <- Reducer 5 (GROUP, 1)
>         Reducer 4 <- Reducer 6 (GROUP, 1)
> {code}
> 2.  DFS
> {code}
>     Spark
>       Edges:
>         Reducer 5 <- Map 1 (SORT, 1)
>         Reducer 3 <- Reducer 5 (GROUP, 1)
>         Reducer 6 <- Map 1 (SORT, 1)
>         Reducer 4 <- Reducer 6 (GROUP, 1)
> {code}
> Both seems better, though topolical seems more suitable for a graph. Please feel free to create a patch on trunk if needed.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)