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Posted to issues@spark.apache.org by "Bruce Robbins (JIRA)" <ji...@apache.org> on 2019/02/06 00:42:00 UTC
[jira] [Comment Edited] (SPARK-26708) Incorrect result caused by
inconsistency between a SQL cache's cached RDD and its physical plan
[ https://issues.apache.org/jira/browse/SPARK-26708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761289#comment-16761289 ]
Bruce Robbins edited comment on SPARK-26708 at 2/6/19 12:41 AM:
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How does one hit this issue?
Edit: Ah, never mind. I see there is a test.
was (Author: bersprockets):
How does one hit this issue?
> Incorrect result caused by inconsistency between a SQL cache's cached RDD and its physical plan
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-26708
> URL: https://issues.apache.org/jira/browse/SPARK-26708
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Xiao Li
> Assignee: Maryann Xue
> Priority: Blocker
> Labels: correctness
> Fix For: 2.4.1, 3.0.0
>
>
> When performing non-cascading cache invalidation, {{recache}} is called on the other cache entries which are dependent on the cache being invalidated. It leads to the the physical plans of those cache entries being re-compiled. For those cache entries, if the cache RDD has already been persisted, chances are there will be inconsistency between the data and the new plan. It can cause a correctness issue if the new plan's {{outputPartitioning}} or {{outputOrdering}} is different from the that of the actual data, and meanwhile the cache is used by another query that asks for specific {{outputPartitioning}} or {{outputOrdering}} which happens to match the new plan but not the actual data.
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