Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/14080#discussion_r70150346
--- Diff:
core/src/main/scala/org/apache/spark/deploy/ExternalShuffleServiceSource.scala
---
@@ -0,0 +1,47 @@
+/*
+ * 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.deploy
+
+import javax.annotation.concurrent.ThreadSafe
+
+import com.codahale.metrics.{Gauge, MetricRegistry}
+
+import org.apache.spark.metrics.source.Source
+import org.apache.spark.network.shuffle.ExternalShuffleBlockHandler
+
+/**
+ * Provides metrics source for external shuffle service
+ */
+@ThreadSafe
+private class ExternalShuffleServiceSource
+(blockHandler: ExternalShuffleBlockHandler) extends Source {
+ override val metricRegistry = new MetricRegistry()
+ override val sourceName = "shuffleService"
+
+ metricRegistry.registerAll(blockHandler.getAllMetrics)
+
+ metricRegistry.register(MetricRegistry.name("registeredExecutorsSize"),
--- End diff --
I mean, why not put them inside blockHandler so that they are registered by
the same `registerAll` call? Then you don't need to expose these extra methods
to get executors size and total shuffle requests.
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