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https://issues.apache.org/jira/browse/SPARK-20295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16256570#comment-16256570
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Liang-Chi Hsieh commented on SPARK-20295:
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Btw, from the partial query plan you posted, looks like the coordinator 1, 2, 3
all only have just one exchange (numExchanges = 1). So I'm not sure if you post
the correct query plan or not.
> when spark.sql.adaptive.enabled is enabled, have conflict with Exchange Resue
> ------------------------------------------------------------------------------
>
> Key: SPARK-20295
> URL: https://issues.apache.org/jira/browse/SPARK-20295
> Project: Spark
> Issue Type: Bug
> Components: Shuffle, SQL
> Affects Versions: 2.1.0
> Reporter: Ruhui Wang
>
> when run tpcds-q95, and set spark.sql.adaptive.enabled = true the physical
> plan firstly:
> Sort
> : +- Exchange(coordinator id: 1)
> : +- Project***
> : :-Sort **
> : : +- Exchange(coordinator id: 2)
> : : :- Project ***
> : +- Sort
> : : +- Exchange(coordinator id: 3)
> spark.sql.exchange.reuse is opened, then physical plan will become below:
> Sort
> : +- Exchange(coordinator id: 1)
> : +- Project***
> : :-Sort **
> : : +- Exchange(coordinator id: 2)
> : : :- Project ***
> : +- Sort
> : : +- ReusedExchange Exchange(coordinator id: 2)
> If spark.sql.adaptive.enabled = true, the code stack is :
> ShuffleExchange#doExecute --> postShuffleRDD function -->
> doEstimationIfNecessary . In this function,
> assert(exchanges.length == numExchanges) will be error, as left side has only
> one element, but right is equal to 2.
> If this is a bug of spark.sql.adaptive.enabled and exchange resue?
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