Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r28285532
--- Diff:
core/src/main/scala/org/apache/spark/deploy/ExecutorDelegationTokenUpdater.scala
---
@@ -0,0 +1,106 @@
+/*
+ * 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 java.util.concurrent.{Executors, TimeUnit}
+import java.util.{Comparator, Arrays}
+
+import com.google.common.primitives.Longs
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.{PathFilter, FileStatus, Path, FileSystem}
+import org.apache.hadoop.security.{Credentials, UserGroupInformation}
+
+import org.apache.spark.util.Utils
+import org.apache.spark.{Logging, SparkConf}
+
+private[spark] class ExecutorDelegationTokenUpdater(
+ sparkConf: SparkConf,
+ hadoopConf: Configuration) extends Logging {
+
+ @volatile private var lastCredentialsFileSuffix = 0
+
+ private lazy val delegationTokenRenewer =
+ Executors.newSingleThreadScheduledExecutor(
+ Utils.namedThreadFactory("Delegation Token Refresh Thread"))
+
+ // On the executor, this thread wakes up and picks up new tokens from
HDFS, if any.
+ private lazy val executorUpdaterRunnable =
+ new Runnable {
+ override def run(): Unit =
Utils.logUncaughtExceptions(updateCredentialsIfRequired())
+ }
+
+ def updateCredentialsIfRequired(): Unit = {
+ try {
+ sparkConf.getOption("spark.yarn.credentials.file").foreach {
credentialsFile =>
--- End diff --
(Actually, it's a lazy val. I hate lazy vals, so confusing.)
Anyway, I still think it would be better to have this as an `Option` on the
caller site and avoid these weird "no-op by accident" semantics.
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