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https://issues.apache.org/jira/browse/SPARK-20295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ruhui Wang updated SPARK-20295:
-------------------------------
Description:
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?
was:
when spark.sql.exchange.reuse is opened, then run a query with self join(such
as tpcds-q95), the physical plan will become below randomly:
WholeStageCodegen
: +- Project [id#0L]
: +- BroadcastHashJoin [id#0L], [id#2L], Inner, BuildRight, None
: :- Project [id#0L]
: : +- BroadcastHashJoin [id#0L], [id#1L], Inner, BuildRight, None
: : :- Range 0, 1, 4, 1024, [id#0L]
: : +- INPUT
: +- INPUT
:- BroadcastExchange HashedRelationBroadcastMode(true,List(id#1L),List(id#1L))
: +- WholeStageCodegen
: : +- Range 0, 1, 4, 1024, [id#1L]
+- ReusedExchange [id#2L], BroadcastExchange
HashedRelationBroadcastMode(true,List(id#1L),List(id#1L))
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?
> 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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