Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22504#discussion_r226468828
--- Diff:
core/src/test/scala/org/apache/spark/util/logging/DriverLoggerSuite.scala ---
@@ -0,0 +1,83 @@
+/*
+ * 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.util.logging
+
+import java.io.{BufferedInputStream, File, FileInputStream}
+
+import org.apache.commons.io.FileUtils
+
+import org.apache.spark._
+import org.apache.spark.{SparkContext, SparkFunSuite}
+import org.apache.spark.internal.config._
+import org.apache.spark.launcher.SparkLauncher
+import org.apache.spark.network.util.JavaUtils
+import org.apache.spark.util.Utils
+
+class DriverLoggerSuite extends SparkFunSuite with LocalSparkContext {
+
+ private var rootHdfsDir : File = _
+
+ override def beforeAll(): Unit = {
+ rootHdfsDir = Utils.createTempDir(namePrefix = "hdfs_logs")
+ }
+
+ override def afterAll(): Unit = {
+ JavaUtils.deleteRecursively(rootHdfsDir)
+ }
+
+ test("driver logs are persisted locally and synced to hdfs") {
+ val sc = getSparkContext()
+
+ val app_id = sc.applicationId
+ // Run a simple spark application
+ sc.parallelize(1 to 1000).count()
+
+ // Assert driver log file exists
+ val rootDir = Utils.getLocalDir(sc.getConf)
+ val driverLogsDir = FileUtils.getFile(rootDir, "driver_logs")
+ assert(driverLogsDir.exists())
+ val files = driverLogsDir.listFiles()
+ assert(files.length === 1)
+ assert(files(0).getName.equals("driver.log"))
+
+ sc.stop()
+ // File is continuously synced to Hdfs (which is a local dir for this
test)
+ assert(!driverLogsDir.exists())
+ val hdfsDir =
FileUtils.getFile(sc.getConf.get(DRIVER_LOG_DFS_DIR).get, app_id)
+ assert(hdfsDir.exists())
+ val hdfsFiles = hdfsDir.listFiles()
--- End diff --
All the checks below are basically:
```
hdfsFiles.exists { f => f.getName() == DRIVER_LOG_FILE && f.length() > 0 }
```
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