Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/42#discussion_r10551998
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/EventLoggingListener.scala ---
@@ -0,0 +1,93 @@
+/*
+ * 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.scheduler
+
+import org.json4s.jackson.JsonMethods._
+
+import org.apache.spark.{Logging, SparkConf}
+import org.apache.spark.io.CompressionCodec
+import org.apache.spark.util.{JsonProtocol, FileLogger}
+
+/**
+ * A SparkListener that logs events to persistent storage.
+ *
+ * Event logging is specified by the following configurable parameters:
+ * spark.eventLog.enabled - Whether event logging is enabled.
+ * spark.eventLog.compress - Whether to compress logged events
+ * spark.eventLog.overwrite - Whether to overwrite any existing files.
+ * spark.eventLog.dir - Path to the directory in which events are logged.
+ * spark.eventLog.buffer.kb - Buffer size to use when writing to output
streams
+ */
+private[spark] class EventLoggingListener(appName: String, conf: SparkConf)
+ extends SparkListener with Logging {
+
+ private val shouldCompress = conf.getBoolean("spark.eventLog.compress",
false)
+ private val shouldOverwrite =
conf.getBoolean("spark.eventLog.overwrite", true)
--- End diff --
I'd set this one to false and actually throw an exception that fails the
job if the directory already exists (and overwrite is not selected).
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