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The following commit(s) were added to refs/heads/master by this push:
new 4c663168f4c6 [SPARK-50897][ML][CONNECT] Avoiding instance creation in
ServiceLoader
4c663168f4c6 is described below
commit 4c663168f4c6097ec1b22db65558a7fd8bb68ac2
Author: Martin Grund <[email protected]>
AuthorDate: Tue Jan 21 05:17:24 2025 +0100
[SPARK-50897][ML][CONNECT] Avoiding instance creation in ServiceLoader
### What changes were proposed in this pull request?
When converting the iterator of the ServiceLoader call to Scala, we
explicitly instantiate all classes that the service loader provides. Since we
do not need the instances, this PR uses the `steam()` of the ServiceLoader to
iterate over the list of providers and just extracts the clasess.
### Why are the changes needed?
Performance / Stability
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Existing tests
### Was this patch authored or co-authored using generative AI tooling?
No
Closes #49577 from grundprinzip/spark_ml_service_loader.
Authored-by: Martin Grund <[email protected]>
Signed-off-by: Martin Grund <[email protected]>
---
.../scala/org/apache/spark/sql/connect/ml/MLUtils.scala | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git
a/sql/connect/server/src/main/scala/org/apache/spark/sql/connect/ml/MLUtils.scala
b/sql/connect/server/src/main/scala/org/apache/spark/sql/connect/ml/MLUtils.scala
index 86dd013b9d98..4e93aec47ef0 100644
---
a/sql/connect/server/src/main/scala/org/apache/spark/sql/connect/ml/MLUtils.scala
+++
b/sql/connect/server/src/main/scala/org/apache/spark/sql/connect/ml/MLUtils.scala
@@ -18,6 +18,7 @@
package org.apache.spark.sql.connect.ml
import java.util.{Optional, ServiceLoader}
+import java.util.stream.Collectors
import scala.collection.immutable.HashSet
import scala.jdk.CollectionConverters._
@@ -50,8 +51,18 @@ private[ml] object MLUtils {
private def loadOperators(mlCls: Class[_]): Map[String, Class[_]] = {
val loader = Utils.getContextOrSparkClassLoader
val serviceLoader = ServiceLoader.load(mlCls, loader)
- val providers = serviceLoader.asScala.toList
- providers.map(est => est.getClass.getName -> est.getClass).toMap
+ // Instead of using the iterator, we use the "stream()" method that allows
+ // to iterate over a collection of providers that do not instantiate the
class
+ // directly. Since there is no good way to convert a Java stream to a
Scala stream,
+ // we collect the Java stream to a Java map and then convert it to a Scala
map.
+ serviceLoader
+ .stream()
+ .collect(
+ Collectors.toMap(
+ (est: ServiceLoader.Provider[_]) => est.`type`().getName,
+ (est: ServiceLoader.Provider[_]) => est.`type`()))
+ .asScala
+ .toMap
}
private def parseInts(ints: proto.Ints): Array[Int] = {
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