TestEditLogLoading.java

/**
 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.hadoop.hdfs.server.namenode;

import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.Test;

public class TestEditLogLoading {

  private static final int NUM_DATA_NODES = 0;

  @Test
  public void testDisplayRecentEditLogOpCodes() throws IOException {
    // start a cluster
    Configuration conf = new Configuration();
    conf.set("dfs.name.dir", new File(MiniDFSCluster.getBaseDir(), "name").getPath());
    conf.setInt(DFSConfigKeys.DFS_NAMENODE_EDITS_TOLERATION_LENGTH_KEY, -1);


    MiniDFSCluster cluster = null;
    FileSystem fileSys = null;
    cluster = new MiniDFSCluster(0, conf, NUM_DATA_NODES, true, false, null, null);
    cluster.waitActive();
    fileSys = cluster.getFileSystem();
    final FSNamesystem namesystem = cluster.getNameNode().getNamesystem();

    FSImage fsimage = namesystem.getFSImage();
    final FSEditLog editLog = fsimage.getEditLog();
    for (int i = 0; i < 20; i++) {
      fileSys.mkdirs(new Path("/tmp/tmp" + i));
    }
    File editFile = editLog.getFsEditName();
    System.out.println("edit log file: " + editFile);
    editLog.close();
    cluster.shutdown();

    // Corrupt the edits file.
    long fileLen = editFile.length();
    RandomAccessFile rwf = new RandomAccessFile(editFile, "rw");
    rwf.seek(fileLen - 40);
    for (int i = 0; i < 20; i++) {
      rwf.write((byte) 2); // FSEditLog.DELETE
    }
    rwf.close();

    String expectedErrorMessage = "^Failed to parse edit log.*";
    expectedErrorMessage += ", Recent opcode offsets=\\[(\\d+\\s*){4}\\]$";
    try {
      cluster = new MiniDFSCluster(0, conf, NUM_DATA_NODES, false, false, null, null);
      cluster.waitActive();
      fail("should not be able to start");
    } catch (IOException e) {
      assertTrue("error message contains opcodes message",
          e.getMessage().matches(expectedErrorMessage));
    }
  }
}