Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/42#discussion_r10598046
--- Diff:
core/src/main/scala/org/apache/spark/storage/BlockManagerStatusListener.scala
---
@@ -0,0 +1,63 @@
+/*
+ * 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.storage
+
+import scala.collection.mutable.ArrayBuffer
+
+import org.apache.spark.scheduler._
+
+/**
+ * A listener for BlockManager status updates.
+ *
+ * This listener provides a way to post executor storage status
information as soon as it
+ * is available (i.e. immediately after the associated BlockManager has
registered with the
+ * driver). This is necessary because the SparkContext is only notified
when an executor is
+ * launched, but by then the storage information is not ready yet.
+ *
+ * Further, it is possible for a BlockManager be registered before the
listener bus on the
+ * driver is initialized (e.g. the driver's own BlockManager), in which
case the corresponding
+ * event should be buffered.
+ */
+private[spark] class BlockManagerStatusListener extends SparkListener {
--- End diff --
Is it possible to avoid this by just creating the EventBus earlier on in
the SparkContext constructor (i.e. changing around the order so it comes before
the the block manager)?
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