[SPARK-29375][SQL] Exchange reuse across all subquery levels #26044

peter-toth · 2019-10-07T17:45:27Z

What changes were proposed in this pull request?

This PR:

enables exchange reuse across all subquery levels
adds minor optimization by using a map of canonicalized plans to look up reusable exchanges

Example query:

SELECT
  (SELECT max(a.key) FROM testData AS a JOIN testData AS b ON b.key = a.key),
  a.key
FROM testData AS a
JOIN testData AS b ON b.key = a.key

Plan before this PR:

*(5) Project [Subquery scalar-subquery#270, [id=#605] AS scalarsubquery()#277, key#13]
:  +- Subquery scalar-subquery#270, [id=#605]
:     +- *(6) HashAggregate(keys=[], functions=[max(key#13)], output=[max(key)#276])
:        +- Exchange SinglePartition, true, [id=#601]
:           +- *(5) HashAggregate(keys=[], functions=[partial_max(key#13)], output=[max#281])
:              +- *(5) Project [key#13]
:                 +- *(5) SortMergeJoin [key#13], [key#273], Inner
:                    :- *(2) Sort [key#13 ASC NULLS FIRST], false, 0
:                    :  +- Exchange hashpartitioning(key#13, 5), true, [id=#584]
:                    :     +- *(1) SerializeFromObject [knownnotnull(assertnotnull(input[0, org.apache.spark.sql.test.SQLTestData$TestData, true])).key AS key#13]
:                    :        +- Scan[obj#12]
:                    +- *(4) Sort [key#273 ASC NULLS FIRST], false, 0
:                       +- Exchange hashpartitioning(key#273, 5), true, [id=#592]
:                          +- *(3) SerializeFromObject [knownnotnull(assertnotnull(input[0, org.apache.spark.sql.test.SQLTestData$TestData, true])).key AS key#273]
:                             +- Scan[obj#12]
+- *(5) SortMergeJoin [key#13], [key#271], Inner
   :- *(2) Sort [key#13 ASC NULLS FIRST], false, 0
   :  +- Exchange hashpartitioning(key#13, 5), true, [id=#617]
   :     +- *(1) SerializeFromObject [knownnotnull(assertnotnull(input[0, org.apache.spark.sql.test.SQLTestData$TestData, true])).key AS key#13]
   :        +- Scan[obj#12]
   +- *(4) Sort [key#271 ASC NULLS FIRST], false, 0
      +- Exchange hashpartitioning(key#271, 5), true, [id=#625]
         +- *(3) SerializeFromObject [knownnotnull(assertnotnull(input[0, org.apache.spark.sql.test.SQLTestData$TestData, true])).key AS key#271]
            +- Scan[obj#12]

Plan after this PR:

*(5) Project [Subquery scalar-subquery#240, [id=#193] AS scalarsubquery()#247, key#13]
:  +- Subquery scalar-subquery#240, [id=#193]
:     +- *(6) HashAggregate(keys=[], functions=[max(key#13)], output=[max(key)#246])
:        +- Exchange SinglePartition, true, [id=#189]
:           +- *(5) HashAggregate(keys=[], functions=[partial_max(key#13)], output=[max#251])
:              +- *(5) Project [key#13]
:                 +- *(5) SortMergeJoin [key#13], [key#243], Inner
:                    :- *(2) Sort [key#13 ASC NULLS FIRST], false, 0
:                    :  +- Exchange hashpartitioning(key#13, 5), true, [id=#145]
:                    :     +- *(1) SerializeFromObject [knownnotnull(assertnotnull(input[0, org.apache.spark.sql.test.SQLTestData$TestData, true])).key AS key#13]
:                    :        +- Scan[obj#12]
:                    +- *(4) Sort [key#243 ASC NULLS FIRST], false, 0
:                       +- ReusedExchange [key#243], Exchange hashpartitioning(key#13, 5), true, [id=#145]
+- *(5) SortMergeJoin [key#13], [key#241], Inner
   :- *(2) Sort [key#13 ASC NULLS FIRST], false, 0
   :  +- ReusedExchange [key#13], Exchange hashpartitioning(key#13, 5), true, [id=#145]
   +- *(4) Sort [key#241 ASC NULLS FIRST], false, 0
      +- ReusedExchange [key#241], Exchange hashpartitioning(key#13, 5), true, [id=#145]

Why are the changes needed?

Performance improvement.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Added a new UT.

SparkQA · 2019-10-07T20:38:15Z

Test build #111847 has finished for PR 26044 at commit e6d4997.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-10-08T07:15:47Z

sql/core/src/test/scala/org/apache/spark/sql/execution/PlannerSuite.scala

@@ -470,7 +470,7 @@ class PlannerSuite extends SharedSparkSession {
      Inner,
      None,
      shuffle,
-      shuffle)
+      shuffle.copy())


If a plan contains the exact same instance of Exchange multiple times then it makes no sense to replace one of the instances to a ReusedExchange.

SparkQA · 2019-10-08T11:01:36Z

Test build #111882 has finished for PR 26044 at commit efd6045.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-10-10T07:52:48Z

cc @gatorsmile @maryannxue @mgaido91

mgaido91 · 2019-10-12T10:46:13Z

sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/Exchange.scala

-          // Keep the output of this exchange, the following plans require that to resolve
-          // attributes.
-          ReusedExchangeExec(exchange.output, samePlan.get)
+        val newExchange = exchanges.getOrElseUpdate(exchange.canonicalized, exchange)


I am a bit worried that this introduces a significant overhead with big plans

I see your point. Let me change this PR a bit and come back to you.

I've modified it a bit to avoid canonicalization if possible.

SparkQA · 2019-10-15T18:54:36Z

Test build #112112 has finished for PR 26044 at commit 8ee1921.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-10-16T16:37:28Z

Test build #112167 has finished for PR 26044 at commit 1475ade.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-10-16T19:08:21Z

Test build #112178 has finished for PR 26044 at commit fe7526e.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-11-01T19:13:30Z

Test build #113098 has finished for PR 26044 at commit fa0ac3a.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-11-02T11:16:22Z

@cloud-fan @dongjoon-hyun @gatorsmile @maropu @maryannxue @mgaido91 @viirya any feedback/comment is gladly welcome

maropu · 2019-11-02T23:22:05Z

Could you show us actual performance numbers with/without this pr?

SparkQA · 2019-11-10T18:24:43Z

Test build #113544 has finished for PR 26044 at commit 2661c3d.

This patch fails to build.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-11-10T18:44:04Z

sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/Exchange.scala

@@ -52,6 +54,13 @@ abstract class Exchange extends UnaryExecNode {
 case class ReusedExchangeExec(override val output: Seq[Attribute], child: Exchange)
  extends LeafExecNode {

+  override def equals(that: Any): Boolean = that match {


A ReusedExchangeExec is a reference to an Exchange, so 2 ReusedExchangeExecs should be equal only if they are pointing to the same Exchange instance.

peter-toth · 2019-11-10T19:33:48Z

Could you show us actual performance numbers with/without this pr?

I created a simple benchmark here: peter-toth@24cfee8 just to show that this PR (originalReuseExchangeVersion - false) makes sense in some cases.

OpenJDK 64-Bit Server VM 1.8.0_212-b04 on Mac OS X 10.14.6
Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
Exchange reuse 1:                         Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
originalReuseExchangeVersion - true               17409          17490         114          0.0  3481886067.0       1.0X
originalReuseExchangeVersion - false               6889           6907          26          0.0  1377804241.4       2.5X

OpenJDK 64-Bit Server VM 1.8.0_212-b04 on Mac OS X 10.14.6
Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
Exchange reuse 2:                         Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
originalReuseExchangeVersion - true               17279          17323          63          0.0  3455745161.4       1.0X
originalReuseExchangeVersion - false               7126           7177          72          0.0  1425193388.2       2.4X

SparkQA · 2019-11-10T19:38:39Z

Test build #113549 has finished for PR 26044 at commit 1634003.

This patch fails to build.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-11-11T07:25:34Z

retest this please

SparkQA · 2019-11-11T07:33:07Z

Test build #113570 has finished for PR 26044 at commit 1634003.

This patch fails to build.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-11-11T08:05:02Z

Test build #113573 has finished for PR 26044 at commit a3978f0.

This patch fails due to an unknown error code, -9.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-11-11T11:44:38Z

Test build #113577 has finished for PR 26044 at commit 04654f3.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-11-18T12:24:06Z

@maropu I also run TPCDS queries and the following queries have modified plans after the PR:

q14a
q14b
q23a
q23b
q24a
q24b
q14-v2.7
q14a-v2.7
q24-v2.7

Here are the plans before and after the PR.
Benchmark results can be found here before and after the PR.
This comparison shows that q24a, q24b and q24-v2.7 become 1.4x times faster due to this change.

SparkQA · 2019-11-18T14:02:00Z

Test build #114016 has finished for PR 26044 at commit 3f9e240.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-11-19T17:45:25Z

retest this please

SparkQA · 2019-11-19T17:53:28Z

Test build #114104 has finished for PR 26044 at commit e0b4ca6.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-11-19T20:45:43Z

Test build #114114 has finished for PR 26044 at commit e0b4ca6.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-11-20T14:03:42Z

Test build #114164 has finished for PR 26044 at commit a3c92e7.

This patch fails Spark unit tests.
This patch merges cleanly.
This patch adds no public classes.

SparkQA · 2019-11-20T19:54:44Z

Test build #114171 has finished for PR 26044 at commit 337735a.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

peter-toth · 2019-11-21T16:19:30Z

sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/HashAggregateExec.scala

-      case fallbackStartsAt =>
-        val splits = fallbackStartsAt.split(",").map(_.trim)
-        Some((splits.head.toInt, splits.last.toInt))
+    Option(sqlContext).flatMap {


This change was required because this UT error:

org.scalatest.exceptions.TestFailedException: udf/postgreSQL/udf-aggregates_part3.sql - Scala UDF Expected "struct<[col:bigint]>", but got "struct<[]>" Schema did not match for query #1 select udf((select udf(count(*)) from (values (1)) t0(inner_c))) as col from (values (2),(3)) t1(outer_c): QueryOutput(select udf((select udf(count(*)) from (values (1)) t0(inner_c))) as col from (values (2),(3)) t1(outer_c),struct<>,java.lang.NullPointerException null)

where the stacktrace of the executor is:

02:43:13.445 ERROR org.apache.spark.executor.Executor: Exception in task 0.0 in stage 8.0 (TID 10) org.apache.spark.sql.catalyst.errors.package$TreeNodeException: makeCopy, tree: HashAggregate(keys=[], functions=[partial_count(1)], output=[count#397L]) +- Project +- LocalTableScan <empty>, [col1#385] at org.apache.spark.sql.catalyst.errors.package$.attachTree(package.scala:56) at org.apache.spark.sql.catalyst.trees.TreeNode.makeCopy(TreeNode.scala:435) at org.apache.spark.sql.catalyst.trees.TreeNode.makeCopy(TreeNode.scala:424) at org.apache.spark.sql.execution.SparkPlan.makeCopy(SparkPlan.scala:102) at org.apache.spark.sql.execution.SparkPlan.makeCopy(SparkPlan.scala:63) at org.apache.spark.sql.catalyst.plans.QueryPlan.mapExpressions(QueryPlan.scala:132) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:261) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.execution.SubqueryExec.doCanonicalize(basicPhysicalOperators.scala:772) at org.apache.spark.sql.execution.SubqueryExec.doCanonicalize(basicPhysicalOperators.scala:742) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.execution.ScalarSubquery.canonicalized$lzycompute(subquery.scala:109) at org.apache.spark.sql.execution.ScalarSubquery.canonicalized(subquery.scala:108) at org.apache.spark.sql.execution.ScalarSubquery.canonicalized(subquery.scala:62) at org.apache.spark.sql.catalyst.expressions.Expression.$anonfun$canonicalized$1(Expression.scala:229) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.expressions.Expression.canonicalized$lzycompute(Expression.scala:229) at org.apache.spark.sql.catalyst.expressions.Expression.canonicalized(Expression.scala:228) at org.apache.spark.sql.catalyst.expressions.Expression.semanticHash(Expression.scala:248) at org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$Expr.hashCode(EquivalentExpressions.scala:41) at scala.runtime.Statics.anyHash(Statics.java:122) at scala.collection.mutable.HashTable$HashUtils.elemHashCode(HashTable.scala:416) at scala.collection.mutable.HashTable$HashUtils.elemHashCode$(HashTable.scala:416) at scala.collection.mutable.HashMap.elemHashCode(HashMap.scala:44) at scala.collection.mutable.HashTable.findEntry(HashTable.scala:136) at scala.collection.mutable.HashTable.findEntry$(HashTable.scala:135) at scala.collection.mutable.HashMap.findEntry(HashMap.scala:44) at scala.collection.mutable.HashMap.get(HashMap.scala:74) at org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExpr(EquivalentExpressions.scala:55) at org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:99) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.$anonfun$subexpressionElimination$1(CodeGenerator.scala:1118) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.$anonfun$subexpressionElimination$1$adapted(CodeGenerator.scala:1118) at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:62) at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:55) at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:49) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.subexpressionElimination(CodeGenerator.scala:1118) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.generateExpressions(CodeGenerator.scala:1170) at org.apache.spark.sql.catalyst.expressions.codegen.GenerateMutableProjection$.create(GenerateMutableProjection.scala:64) at org.apache.spark.sql.catalyst.expressions.codegen.GenerateMutableProjection$.generate(GenerateMutableProjection.scala:49) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.createCodeGeneratedObject(Projection.scala:84) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.createCodeGeneratedObject(Projection.scala:80) at org.apache.spark.sql.catalyst.expressions.CodeGeneratorWithInterpretedFallback.createObject(CodeGeneratorWithInterpretedFallback.scala:47) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.create(Projection.scala:95) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.create(Projection.scala:103) at org.apache.spark.sql.execution.SparkPlan.newMutableProjection(SparkPlan.scala:471) at org.apache.spark.sql.execution.python.EvalPythonExec.$anonfun$doExecute$2(EvalPythonExec.scala:116) at org.apache.spark.rdd.RDD.$anonfun$mapPartitions$2(RDD.scala:837) at org.apache.spark.rdd.RDD.$anonfun$mapPartitions$2$adapted(RDD.scala:837) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:349) at org.apache.spark.rdd.RDD.iterator(RDD.scala:313) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:349) at org.apache.spark.rdd.RDD.iterator(RDD.scala:313) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:349) at org.apache.spark.rdd.RDD.iterator(RDD.scala:313) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:90) at org.apache.spark.scheduler.Task.run(Task.scala:127) at org.apache.spark.executor.Executor$TaskRunner.$anonfun$run$3(Executor.scala:425) at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1377) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:428) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.GeneratedConstructorAccessor41.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$makeCopy$7(TreeNode.scala:468) at org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:72) at org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$makeCopy$1(TreeNode.scala:467) at org.apache.spark.sql.catalyst.errors.package$.attachTree(package.scala:52) ... 151 more Caused by: java.lang.NullPointerException at org.apache.spark.sql.execution.aggregate.HashAggregateExec.<init>(HashAggregateExec.scala:96) ... 158 more

Because this PR adds lazy val canonicalized to ScalarSubquery, EvalPythonExec invoked canonicalization of HashAggregateExec on an executor where SparkSession is not available.
Honestly I'm not sure how many other SparkPlan nodes exist that can't be canonocalized on an executor for similar reasons.

InSubqueryExec already has lazy val canonicalized defined so maybe this issue could come up without this PR in some DPP usecases.

peter-toth · 2019-11-21T16:23:38Z

sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ShuffleExchangeExec.scala

@@ -59,7 +59,7 @@ case class ShuffleExchangeExec(

  override def nodeName: String = "Exchange"

-  private val serializer: Serializer =
+  private lazy val serializer: Serializer =


Similar reasons for this change as above. This time the stacktrace is:

04:31:28.110 ERROR org.apache.spark.executor.Executor: Exception in task 0.0 in stage 8.0 (TID 10) org.apache.spark.sql.catalyst.errors.package$TreeNodeException: makeCopy, tree: Exchange SinglePartition, true, [id=#180] +- *(1) HashAggregate(keys=[], functions=[partial_count(1)], output=[count#397L]) +- *(1) Project +- *(1) LocalTableScan <empty>, [col1#385] at org.apache.spark.sql.catalyst.errors.package$.attachTree(package.scala:56) at org.apache.spark.sql.catalyst.trees.TreeNode.makeCopy(TreeNode.scala:435) at org.apache.spark.sql.catalyst.trees.TreeNode.makeCopy(TreeNode.scala:424) at org.apache.spark.sql.execution.SparkPlan.makeCopy(SparkPlan.scala:102) at org.apache.spark.sql.execution.SparkPlan.makeCopy(SparkPlan.scala:63) at org.apache.spark.sql.catalyst.trees.TreeNode.withNewChildren(TreeNode.scala:263) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:277) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.catalyst.plans.QueryPlan.$anonfun$doCanonicalize$1(QueryPlan.scala:259) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.plans.QueryPlan.doCanonicalize(QueryPlan.scala:259) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.execution.SubqueryExec.doCanonicalize(basicPhysicalOperators.scala:772) at org.apache.spark.sql.execution.SubqueryExec.doCanonicalize(basicPhysicalOperators.scala:742) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:245) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:244) at org.apache.spark.sql.execution.ScalarSubquery.canonicalized$lzycompute(subquery.scala:109) at org.apache.spark.sql.execution.ScalarSubquery.canonicalized(subquery.scala:108) at org.apache.spark.sql.execution.ScalarSubquery.canonicalized(subquery.scala:62) at org.apache.spark.sql.catalyst.expressions.Expression.$anonfun$canonicalized$1(Expression.scala:229) at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:238) at scala.collection.immutable.List.foreach(List.scala:392) at scala.collection.TraversableLike.map(TraversableLike.scala:238) at scala.collection.TraversableLike.map$(TraversableLike.scala:231) at scala.collection.immutable.List.map(List.scala:298) at org.apache.spark.sql.catalyst.expressions.Expression.canonicalized$lzycompute(Expression.scala:229) at org.apache.spark.sql.catalyst.expressions.Expression.canonicalized(Expression.scala:228) at org.apache.spark.sql.catalyst.expressions.Expression.semanticHash(Expression.scala:248) at org.apache.spark.sql.catalyst.expressions.EquivalentExpressions$Expr.hashCode(EquivalentExpressions.scala:41) at scala.runtime.Statics.anyHash(Statics.java:122) at scala.collection.mutable.HashTable$HashUtils.elemHashCode(HashTable.scala:416) at scala.collection.mutable.HashTable$HashUtils.elemHashCode$(HashTable.scala:416) at scala.collection.mutable.HashMap.elemHashCode(HashMap.scala:44) at scala.collection.mutable.HashTable.findEntry(HashTable.scala:136) at scala.collection.mutable.HashTable.findEntry$(HashTable.scala:135) at scala.collection.mutable.HashMap.findEntry(HashMap.scala:44) at scala.collection.mutable.HashMap.get(HashMap.scala:74) at org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExpr(EquivalentExpressions.scala:55) at org.apache.spark.sql.catalyst.expressions.EquivalentExpressions.addExprTree(EquivalentExpressions.scala:99) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.$anonfun$subexpressionElimination$1(CodeGenerator.scala:1118) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.$anonfun$subexpressionElimination$1$adapted(CodeGenerator.scala:1118) at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:62) at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:55) at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:49) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.subexpressionElimination(CodeGenerator.scala:1118) at org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext.generateExpressions(CodeGenerator.scala:1170) at org.apache.spark.sql.catalyst.expressions.codegen.GenerateMutableProjection$.create(GenerateMutableProjection.scala:64) at org.apache.spark.sql.catalyst.expressions.codegen.GenerateMutableProjection$.generate(GenerateMutableProjection.scala:49) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.createCodeGeneratedObject(Projection.scala:84) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.createCodeGeneratedObject(Projection.scala:80) at org.apache.spark.sql.catalyst.expressions.CodeGeneratorWithInterpretedFallback.createObject(CodeGeneratorWithInterpretedFallback.scala:47) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.create(Projection.scala:95) at org.apache.spark.sql.catalyst.expressions.MutableProjection$.create(Projection.scala:103) at org.apache.spark.sql.execution.SparkPlan.newMutableProjection(SparkPlan.scala:471) at org.apache.spark.sql.execution.python.EvalPythonExec.$anonfun$doExecute$2(EvalPythonExec.scala:116) at org.apache.spark.rdd.RDD.$anonfun$mapPartitions$2(RDD.scala:837) at org.apache.spark.rdd.RDD.$anonfun$mapPartitions$2$adapted(RDD.scala:837) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:349) at org.apache.spark.rdd.RDD.iterator(RDD.scala:313) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:349) at org.apache.spark.rdd.RDD.iterator(RDD.scala:313) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:349) at org.apache.spark.rdd.RDD.iterator(RDD.scala:313) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:90) at org.apache.spark.scheduler.Task.run(Task.scala:127) at org.apache.spark.executor.Executor$TaskRunner.$anonfun$run$3(Executor.scala:425) at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1377) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:428) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$makeCopy$7(TreeNode.scala:468) at org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:72) at org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$makeCopy$1(TreeNode.scala:467) at org.apache.spark.sql.catalyst.errors.package$.attachTree(package.scala:52) ... 133 more Caused by: java.lang.NullPointerException at org.apache.spark.sql.execution.SparkPlan.sparkContext(SparkPlan.scala:72) at org.apache.spark.sql.execution.exchange.ShuffleExchangeExec.metrics$lzycompute(ShuffleExchangeExec.scala:57) at org.apache.spark.sql.execution.exchange.ShuffleExchangeExec.metrics(ShuffleExchangeExec.scala:58) at org.apache.spark.sql.execution.SparkPlan.longMetric(SparkPlan.scala:149) at org.apache.spark.sql.execution.exchange.ShuffleExchangeExec.<init>(ShuffleExchangeExec.scala:63) ... 141 more

And if serializer is not lazy then it makes no sense for metrics to be lazy.

peter-toth · 2019-11-22T08:13:24Z

@maropu

Could you show us actual performance numbers with/without this pr?

This PR results 1.4x times speedup on q24 queries. Here is a detailed comparison: #26044 (comment)
Do you think we can proceed?

SparkQA · 2019-12-15T15:10:49Z

Test build #115358 has finished for PR 26044 at commit ed26b33.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

github-actions · 2020-03-25T00:10:12Z

We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and ask a committer to remove the Stale tag!

dongjoon-hyun added the SQL label Oct 7, 2019

peter-toth commented Oct 8, 2019

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peter-toth changed the title ~~[SPARK-29375][SQL][WIP] Exchange reuse across all subquery levels~~ [SPARK-29375][SQL] Exchange reuse across all subquery levels Oct 10, 2019

mgaido91 reviewed Oct 12, 2019

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peter-toth force-pushed the SPARK-29375-exchange-reuse branch 2 times, most recently from 1475ade to fe7526e Compare October 16, 2019 15:12

peter-toth force-pushed the SPARK-29375-exchange-reuse branch from fe7526e to fa0ac3a Compare November 1, 2019 15:19

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peter-toth force-pushed the SPARK-29375-exchange-reuse branch from a3978f0 to 04654f3 Compare November 11, 2019 08:02

peter-toth force-pushed the SPARK-29375-exchange-reuse branch from 04654f3 to 3f9e240 Compare November 18, 2019 12:03

peter-toth force-pushed the SPARK-29375-exchange-reuse branch from a3c92e7 to 337735a Compare November 20, 2019 16:02

peter-toth commented Nov 21, 2019

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peter-toth added 3 commits December 15, 2019 12:20

[SPARK-29375][SQL] Exchange reuse across all subquery levels

da4381a

add missing canonicalization to ScalarSubquery

ef3eaf0

fix canonicalization issues on executors (sqlContext is null)

ed26b33

peter-toth force-pushed the SPARK-29375-exchange-reuse branch from 337735a to ed26b33 Compare December 15, 2019 11:25

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[SPARK-29375][SQL] Exchange reuse across all subquery levels #26044

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What changes were proposed in this pull request?

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Does this PR introduce any user-facing change?

How was this patch tested?

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