[GitHub] [incubator-iotdb] qiaojialin commented on a change in pull request #417: [IOTDB-234] Refactor TsFile storage on HDFS

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qiaojialin commented on a change in pull request #417: [IOTDB-234] Refactor TsFile storage on HDFS
URL: https://github.com/apache/incubator-iotdb/pull/417#discussion_r336303498
 
 

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 File path: tsfile/src/main/java/org/apache/iotdb/tsfile/fileSystem/fsFactory/HDFSFactory.java
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 @@ -0,0 +1,190 @@
+/*
+ * 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.iotdb.tsfile.fileSystem.fsFactory;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.URI;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class HDFSFactory implements FSFactory {
+
+  private static final Logger logger = LoggerFactory.getLogger(HDFSFactory.class);
+  private static Constructor constructorWithPathname;
+  private static Constructor constructorWithParentStringAndChild;
+  private static Constructor constructorWithParentFileAndChild;
+  private static Constructor constructorWithUri;
+  private static Method getBufferedReader;
+  private static Method getBufferedWriter;
+  private static Method getBufferedInputStream;
+  private static Method getBufferedOutputStream;
+  private static Method listFilesBySuffix;
+  private static Method listFilesByPrefix;
+
+  static {
+    try {
+      Class<?> clazz = Class.forName("org.apache.iotdb.tsfile.fileSystem.HDFSFile");
+      constructorWithPathname = clazz.getConstructor(String.class);
+      constructorWithParentStringAndChild = clazz.getConstructor(String.class, String.class);
+      constructorWithParentFileAndChild = clazz.getConstructor(File.class, String.class);
+      constructorWithUri = clazz.getConstructor(URI.class);
+      getBufferedReader = clazz.getMethod("getBufferedReader", String.class);
+      getBufferedWriter = clazz.getMethod("getBufferedWriter", String.class, boolean.class);
+      getBufferedInputStream = clazz.getMethod("getBufferedInputStream", String.class);
+      getBufferedOutputStream = clazz.getMethod("getBufferedOutputStream", String.class);
+      listFilesBySuffix = clazz.getMethod("listFilesBySuffix", String.class, String.class);
+      listFilesByPrefix = clazz.getMethod("listFilesByPrefix", String.class, String.class);
+    } catch (ClassNotFoundException | NoSuchMethodException e) {
+      logger.error(
+          "Failed to get Hadoop file system. Please check your dependency of Hadoop module.", e);
 
 Review comment:
   So, even if we store data files on the local file system, the server will also print an error log? This should be avoided.

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