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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-24011) Cache rdd's immediate parent ShuffleDependencies to accelerate getShuffleDependencies()
Date Wed, 18 Apr 2018 10:47:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-24011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-24011:
------------------------------------

    Assignee: Apache Spark

> Cache rdd's immediate parent ShuffleDependencies to accelerate getShuffleDependencies()
> ---------------------------------------------------------------------------------------
>
>                 Key: SPARK-24011
>                 URL: https://issues.apache.org/jira/browse/SPARK-24011
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: wuyi
>            Assignee: Apache Spark
>            Priority: Minor
>
> When creating stages for jobs, we need to find a rdd's (except the final rdd) immediate
parent ShuffleDependencies by method getShuffleDependencies() for at least 2 times (first
in
> getMissingAncestorShuffleDependencies(), and second in getOrCreateParentStages()).
> So, we can cache the result at the fist time we call getShuffleDependencies().
> This is helpful for cutting time consuming when there's many NarrowDependencies between
the rdd and its immediate parent ShuffleDependencies or if the rdd has a number of immediate
parent ShuffleDependencies .
>  
> There's an exception for checkpointed rdd. If a rdd is checkpointed, it's immediate
parent ShuffleDependencies should adjust to empty.



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