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From jgho...@apache.org
Subject svn commit: r1035842 - /hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestParallelImageWrite.java
Date Tue, 16 Nov 2010 22:24:23 GMT
Author: jghoman
Date: Tue Nov 16 22:24:23 2010
New Revision: 1035842

URL: http://svn.apache.org/viewvc?rev=1035842&view=rev
Log:
Forgot to add new test case in previous commit.

Added:
    hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestParallelImageWrite.java

Added: hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestParallelImageWrite.java
URL: http://svn.apache.org/viewvc/hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestParallelImageWrite.java?rev=1035842&view=auto
==============================================================================
--- hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestParallelImageWrite.java
(added)
+++ hadoop/hdfs/trunk/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestParallelImageWrite.java
Tue Nov 16 22:24:23 2010
@@ -0,0 +1,133 @@
+/**
+ * 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.hadoop.hdfs.server.namenode;
+
+import junit.framework.TestCase;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.server.namenode.FSImage;
+import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction;
+import org.apache.hadoop.util.PureJavaCrc32;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.ArrayList;
+
+import java.io.File;
+import java.io.FileInputStream;
+
+/**
+ * A JUnit test for checking if restarting DFS preserves integrity.
+ * Specifically with FSImage being written in parallel
+ */
+public class TestParallelImageWrite extends TestCase {
+  /** check if DFS remains in proper condition after a restart */
+  public void testRestartDFS() throws Exception {
+    final Configuration conf = new HdfsConfiguration();
+    MiniDFSCluster cluster = null;
+    FSNamesystem fsn = null;
+    DFSTestUtil files = new DFSTestUtil("TestRestartDFS", 200, 3, 8*1024);
+
+    final String dir = "/srcdat";
+    final Path rootpath = new Path("/");
+    final Path dirpath = new Path(dir);
+
+    long rootmtime;
+    FileStatus rootstatus;
+    FileStatus dirstatus;
+
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).format(true).numDataNodes(4).build();
+      FileSystem fs = cluster.getFileSystem();
+      files.createFiles(fs, dir);
+
+      rootmtime = fs.getFileStatus(rootpath).getModificationTime();
+      rootstatus = fs.getFileStatus(dirpath);
+      dirstatus = fs.getFileStatus(dirpath);
+
+      fs.setOwner(rootpath, rootstatus.getOwner() + "_XXX", null);
+      fs.setOwner(dirpath, null, dirstatus.getGroup() + "_XXX");
+    } finally {
+      if (cluster != null) { cluster.shutdown(); }
+    }
+    try {
+      // Here we restart the MiniDFScluster without formatting namenode
+      cluster = new MiniDFSCluster.Builder(conf).format(false).numDataNodes(4).build();
+      fsn = cluster.getNamesystem();
+      FileSystem fs = cluster.getFileSystem();
+      assertTrue("Filesystem corrupted after restart.",
+                 files.checkFiles(fs, dir));
+
+      final FileStatus newrootstatus = fs.getFileStatus(rootpath);
+      assertEquals(rootmtime, newrootstatus.getModificationTime());
+      assertEquals(rootstatus.getOwner() + "_XXX", newrootstatus.getOwner());
+      assertEquals(rootstatus.getGroup(), newrootstatus.getGroup());
+
+      final FileStatus newdirstatus = fs.getFileStatus(dirpath);
+      assertEquals(dirstatus.getOwner(), newdirstatus.getOwner());
+      assertEquals(dirstatus.getGroup() + "_XXX", newdirstatus.getGroup());
+      rootmtime = fs.getFileStatus(rootpath).getModificationTime();
+
+      checkImages(fsn);
+
+      // Modify the system and then perform saveNamespace
+      files.cleanup(fs, dir);
+      files.createFiles(fs, dir);
+      fsn.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
+      cluster.getNameNode().saveNamespace();
+      checkImages(fsn);
+      fsn.setSafeMode(SafeModeAction.SAFEMODE_LEAVE);
+      files.cleanup(fs, dir);
+    } finally {
+      if (cluster != null) { cluster.shutdown(); }
+    }
+  }
+  
+  private void checkImages(FSNamesystem fsn) throws Exception {
+    Iterator<StorageDirectory> iter = fsn.
+            getFSImage().dirIterator(FSImage.NameNodeDirType.IMAGE);
+    List<Long> checksums = new ArrayList<Long>();
+    while (iter.hasNext()) {
+      StorageDirectory sd = iter.next();
+      File fsImage = FSImage.getImageFile(sd, FSImage.NameNodeFile.IMAGE);
+      PureJavaCrc32 crc = new PureJavaCrc32();
+      FileInputStream in = new FileInputStream(fsImage);
+      byte[] buff = new byte[4096];
+      int read = 0;
+      while ((read = in.read(buff)) != -1) {
+       crc.update(buff, 0, read);
+      }
+      long val = crc.getValue();
+      checksums.add(val);
+    }
+    assertTrue("Not enough fsimage copies in MiniDFSCluster " + 
+               "to test parallel write", checksums.size() > 1);
+    for (int i = 1; i < checksums.size(); i++) {
+      assertEquals(checksums.get(i - 1), checksums.get(i));
+    }
+  }
+}
+



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