Ngone51 commented on a change in pull request #25670: [SPARK-28869][CORE] Roll 
over event log files
URL: https://github.com/apache/spark/pull/25670#discussion_r332475839
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/deploy/history/EventLogFileReaders.scala
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 @@ -0,0 +1,260 @@
+/*
+ * 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.history
+
+import java.io.{BufferedInputStream, InputStream}
+import java.util.concurrent.ConcurrentHashMap
+import java.util.zip.{ZipEntry, ZipOutputStream}
+
+import com.google.common.io.ByteStreams
+import org.apache.hadoop.fs.{FileStatus, FileSystem, Path}
+import org.apache.hadoop.hdfs.DFSInputStream
+
+import org.apache.spark.SparkConf
+import org.apache.spark.deploy.history.EventLogFileWriter.codecName
+import org.apache.spark.io.CompressionCodec
+import org.apache.spark.util.Utils
+
+/** The base class of reader which will read the information of event log 
file(s). */
+abstract class EventLogFileReader(
+    protected val fileSystem: FileSystem,
+    val rootPath: Path) {
+
+  protected def fileSizeForDFS(path: Path): Option[Long] = {
+    Utils.tryWithResource(fileSystem.open(path)) { in =>
+      in.getWrappedStream match {
+        case dfsIn: DFSInputStream => Some(dfsIn.getFileLength)
+        case _ => None
+      }
+    }
+  }
+
+  protected def addFileAsZipEntry(
+      zipStream: ZipOutputStream,
+      path: Path,
+      entryName: String): Unit = {
+    Utils.tryWithResource(fileSystem.open(path, 1 * 1024 * 1024)) { 
inputStream =>
+      zipStream.putNextEntry(new ZipEntry(entryName))
+      ByteStreams.copy(inputStream, zipStream)
+      zipStream.closeEntry()
+    }
+  }
+
+  /** Returns the last index of event log files. None for single event log 
file. */
+  def lastIndex: Option[Long]
+
+  /**
+   * Returns the size of file for the last index of event log files. Returns 
its size for
+   * single event log file.
+   */
+  def fileSizeForLastIndex: Long
+
+  /** Returns whether the application is completed. */
+  def completed: Boolean
+
+  /**
+   * Returns the size of file for the last index of event log files, only when
+   * underlying input stream is DFSInputStream. Otherwise returns None.
+   */
+  def fileSizeForLastIndexForDFS: Option[Long]
+
+  /** Returns the modification time for the last index of event log files. */
 
 Review comment:
   `Returns the modification time for the last index of event log files or 
single event log file` ?

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