Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/19876#discussion_r161944495
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
@@ -126,15 +180,69 @@ abstract class MLWriter extends BaseReadWrite with
Logging {
this
}
+ // override for Java compatibility
+ override def session(sparkSession: SparkSession): this.type =
super.session(sparkSession)
+
+ // override for Java compatibility
+ override def context(sqlContext: SQLContext): this.type =
super.session(sqlContext.sparkSession)
+}
+
+/**
+ * A ML Writer which delegates based on the requested format.
+ */
+class GeneralMLWriter(stage: PipelineStage) extends MLWriter with Logging {
--- End diff --
The follow up issue to track this is
https://issues.apache.org/jira/browse/SPARK-11241
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