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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/04/18 10:47:00 UTC
[jira] [Commented] (SPARK-24011) Cache rdd's immediate parent
ShuffleDependencies to accelerate getShuffleDependencies()
[ https://issues.apache.org/jira/browse/SPARK-24011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442259#comment-16442259 ]
Apache Spark commented on SPARK-24011:
--------------------------------------
User 'Ngone51' has created a pull request for this issue:
https://github.com/apache/spark/pull/21096
> 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
> 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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