[GitHub] [spark] mccheah commented on a change in pull request #28618: [SPARK-31801][API][SHUFFLE] Register map output metadata

[GitBox <gi...@apache.org>]

mccheah commented on a change in pull request #28618:
URL: https://github.com/apache/spark/pull/28618#discussion_r485993728



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File path: core/src/main/java/org/apache/spark/shuffle/api/metadata/ShuffleOutputTracker.java
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@@ -0,0 +1,56 @@
+/*
+ * 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.shuffle.api.metadata;
+
+/**
+ * :: Private ::
+ *
+ * A plugin that can monitor the storage of shuffle data from map tasks, and can provide
+ * metadata to shuffle readers to aid their reading of shuffle blocks in reduce tasks.
+ * <p>
+ * {@link MapOutputMetadata} instances provided from the plugin tree's implementation of
+ * {@link org.apache.spark.shuffle.api.ShuffleMapOutputWriter} are sent to
+ * <p>
+ * Implementations MUST be thread-safe. Spark will invoke methods in this module in parallel.
+ */
+public interface ShuffleOutputTracker {
+
+  /**
+   * Called when a new shuffle stage is going to be run.
+   */
+  void registerShuffle(int shuffleId);
+

Review comment:
       I'm hesitant to make significant API changes given how late this is in the review stage - let's add it as a follow-up if there are concrete use cases that require it down the road.




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