Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/3197#discussion_r20344154
--- Diff:
core/src/main/scala/org/apache/spark/api/java/JavaSparkStatusAPI.scala ---
@@ -0,0 +1,77 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.api.java
+
+import org.apache.spark.{SparkStageInfo, SparkJobInfo, SparkContext}
+
+/**
+ * Low-level status reporting APIs for monitoring job and stage progress.
+ *
+ * These APIs intentionally provide very weak consistency semantics;
consumers of these APIs should
+ * be prepared to handle empty / missing information. For example, a
job's stage ids may be known
+ * but the status API may not have any information about the details of
those stages, so
+ * `getStageInfo` could potentially return `null` for a valid stage id.
+ *
+ * To limit memory usage, these APIs only provide information on recent
jobs / stages. These APIs
+ * will provide information for the last `spark.ui.retainedStages` stages
and
+ * `spark.ui.retainedJobs` jobs.
+ */
+class JavaSparkStatusAPI private (sc: SparkContext) {
--- End diff --
can we conslidate the java and the scala class? it seems to me you are only
using arrays, so it should be fine.
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