Examples of org.apache.hadoop.tools.DistCp

org.apache.hadoop.tools.DistCp
DistCp is the main driver-class for DistCpV2. For command-line use, DistCp::main() orchestrates the parsing of command-line parameters and the launch of the DistCp job. For programmatic use, a DistCp object can be constructed by specifying options (in a DistCpOptions object), and DistCp::execute() may be used to launch the copy-job. DistCp may alternatively be sub-classed to fine-tune behaviour.

  /** copy files from local file system to local file system */
  public void testCopyFromLocalToLocal() throws Exception {
    Configuration conf = new Configuration();
    FileSystem localfs = FileSystem.get(LOCAL_FS, conf);
    MyFile[] files = createFiles(LOCAL_FS, TEST_ROOT_DIR+"/srcdat");
    ToolRunner.run(new DistCp(new Configuration()),
                           new String[] {"file:///"+TEST_ROOT_DIR+"/srcdat",
                                         "file:///"+TEST_ROOT_DIR+"/destdat"});
    assertTrue("Source and destination directories do not match.",
               checkFiles(localfs, TEST_ROOT_DIR+"/destdat", files));
    deldir(localfs, TEST_ROOT_DIR+"/destdat");

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      cluster = new MiniDFSCluster(conf, 2, true, null);
      final FileSystem hdfs = cluster.getFileSystem();
      namenode = FileSystem.getDefaultUri(conf).toString();
      if (namenode.startsWith("hdfs://")) {
        MyFile[] files = createFiles(URI.create(namenode), "/srcdat");
        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-log",
                                         namenode+"/logs",
                                         namenode+"/srcdat",
                                         namenode+"/destdat"});
        assertTrue("Source and destination directories do not match.",

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      cluster = new MiniDFSCluster(conf, 1, true, null);
      final FileSystem hdfs = cluster.getFileSystem();
      final String namenode = hdfs.getUri().toString();
      if (namenode.startsWith("hdfs://")) {
        MyFile[] files = createFiles(LOCAL_FS, TEST_ROOT_DIR+"/srcdat");
        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-log",
                                         namenode+"/logs",
                                         "file:///"+TEST_ROOT_DIR+"/srcdat",
                                         namenode+"/destdat"});
        assertTrue("Source and destination directories do not match.",

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      cluster = new MiniDFSCluster(conf, 1, true, null);
      final FileSystem hdfs = cluster.getFileSystem();
      final String namenode = FileSystem.getDefaultUri(conf).toString();
      if (namenode.startsWith("hdfs://")) {
        MyFile[] files = createFiles(URI.create(namenode), "/srcdat");
        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-log",
                                         "/logs",
                                         namenode+"/srcdat",
                                         "file:///"+TEST_ROOT_DIR+"/destdat"});
        assertTrue("Source and destination directories do not match.",

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      final String namenode = FileSystem.getDefaultUri(conf).toString();
      if (namenode.startsWith("hdfs://")) {
        MyFile[] files = createFiles(URI.create(namenode), "/srcdat");
        String destdir = TEST_ROOT_DIR + "/destdat";
        MyFile[] localFiles = createFiles(localfs, destdir);
        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-delete",
                                         "-update",
                                         "-log",
                                         "/logs",
                                         namenode+"/srcdat",

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      cluster = new MiniDFSCluster(conf, 2, true, null);
      final FileSystem hdfs = cluster.getFileSystem();
      final String namenode = hdfs.getUri().toString();
      if (namenode.startsWith("hdfs://")) {
        MyFile[] files = createFiles(URI.create(namenode), "/srcdat");
        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-p",
                                         "-log",
                                         namenode+"/logs",
                                         namenode+"/srcdat",
                                         namenode+"/destdat"});
        assertTrue("Source and destination directories do not match.",
                   checkFiles(hdfs, "/destdat", files));
        FileSystem fs = FileSystem.get(URI.create(namenode+"/logs"), conf);
        assertTrue("Log directory does not exist.",
                    fs.exists(new Path(namenode+"/logs")));


        FileStatus[] dchkpoint = getFileStatus(hdfs, "/destdat", files);
        final int nupdate = NFILES>>2;
        updateFiles(cluster.getFileSystem(), "/srcdat", files, nupdate);
        deldir(hdfs, "/logs");


        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-p",
                                         "-update",
                                         "-log",
                                         namenode+"/logs",
                                         namenode+"/srcdat",
                                         namenode+"/destdat"});
        assertTrue("Source and destination directories do not match.",
                   checkFiles(hdfs, "/destdat", files));
        assertTrue("Update failed to replicate all changes in src",
                 checkUpdate(hdfs, dchkpoint, "/destdat", files, nupdate));


        deldir(hdfs, "/logs");
        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-p",
                                         "-overwrite",
                                         "-log",
                                         namenode+"/logs",
                                         namenode+"/srcdat",

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        out = fs.create(destPath, true);
        out.writeUTF(destData);
        out.close();
        
        // Run with -skipcrccheck option
        ToolRunner.run(new DistCp(conf), new String[] {
          "-p",
          "-update",
          "-skipcrccheck",
          "-log",
          namenode+"/logs",
          namenode+"/srcdat",
          namenode+"/destdat"});
        
        // File should not be overwritten
        FSDataInputStream in = hdfs.open(destPath);
        String s = in.readUTF();
        System.out.println("Dest had: " + s);
        assertTrue("Dest got over written even with skip crc",
            s.equalsIgnoreCase(destData));
        in.close();
        
        deldir(hdfs, "/logs");


        // Run without the option        
        ToolRunner.run(new DistCp(conf), new String[] {
          "-p",
          "-update",
          "-log",
          namenode+"/logs",
          namenode+"/srcdat",

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  public void testCopyDuplication() throws Exception {
    final FileSystem localfs = FileSystem.get(LOCAL_FS, new Configuration());
    try {    
      MyFile[] files = createFiles(localfs, TEST_ROOT_DIR+"/srcdat");
      ToolRunner.run(new DistCp(new Configuration()),
          new String[] {"file:///"+TEST_ROOT_DIR+"/srcdat",
                        "file:///"+TEST_ROOT_DIR+"/src2/srcdat"});
      assertTrue("Source and destination directories do not match.",
                 checkFiles(localfs, TEST_ROOT_DIR+"/src2/srcdat", files));
  
      assertEquals(DistCp.DuplicationException.ERROR_CODE,
          ToolRunner.run(new DistCp(new Configuration()),
          new String[] {"file:///"+TEST_ROOT_DIR+"/srcdat",
                        "file:///"+TEST_ROOT_DIR+"/src2/srcdat",
                        "file:///"+TEST_ROOT_DIR+"/destdat",}));
    }
    finally {

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    FileSystem fs = FileSystem.get(LOCAL_FS, new Configuration());
    Path root = new Path(TEST_ROOT_DIR+"/srcdat");
    try {    
      MyFile[] files = {createFile(root, fs)};
      //copy a dir with a single file
      ToolRunner.run(new DistCp(new Configuration()),
          new String[] {"file:///"+TEST_ROOT_DIR+"/srcdat",
                        "file:///"+TEST_ROOT_DIR+"/destdat"});
      assertTrue("Source and destination directories do not match.",
                 checkFiles(fs, TEST_ROOT_DIR+"/destdat", files));
      
      //copy a single file
      String fname = files[0].getName();
      Path p = new Path(root, fname);
      FileSystem.LOG.info("fname=" + fname + ", exists? " + fs.exists(p));
      ToolRunner.run(new DistCp(new Configuration()),
          new String[] {"file:///"+TEST_ROOT_DIR+"/srcdat/"+fname,
                        "file:///"+TEST_ROOT_DIR+"/dest2/"+fname});
      assertTrue("Source and destination directories do not match.",
          checkFiles(fs, TEST_ROOT_DIR+"/dest2", files));     
      //copy single file to existing dir
      deldir(fs, TEST_ROOT_DIR+"/dest2");
      fs.mkdirs(new Path(TEST_ROOT_DIR+"/dest2"));
      MyFile[] files2 = {createFile(root, fs, 0)};
      String sname = files2[0].getName();
      ToolRunner.run(new DistCp(new Configuration()),
          new String[] {"-update",
                        "file:///"+TEST_ROOT_DIR+"/srcdat/"+sname,
                        "file:///"+TEST_ROOT_DIR+"/dest2/"});
      assertTrue("Source and destination directories do not match.",
          checkFiles(fs, TEST_ROOT_DIR+"/dest2", files2));     
      updateFiles(fs, TEST_ROOT_DIR+"/srcdat", files2, 1);
      //copy single file to existing dir w/ dst name conflict
      ToolRunner.run(new DistCp(new Configuration()),
          new String[] {"-update",
                        "file:///"+TEST_ROOT_DIR+"/srcdat/"+sname,
                        "file:///"+TEST_ROOT_DIR+"/dest2/"});
      assertTrue("Source and destination directories do not match.",
          checkFiles(fs, TEST_ROOT_DIR+"/dest2", files2));

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        MyFile[] files = createFiles(URI.create(nnUri), "/srcdat");
        FileStatus[] srcstat = getFileStatus(fs, "/srcdat", files);
        for(int i = 0; i < srcstat.length; i++) {
          fs.setOwner(srcstat[i].getPath(), "u" + i, null);
        }
        ToolRunner.run(new DistCp(conf),
            new String[]{"-pu", nnUri+"/srcdat", nnUri+"/destdat"});
        assertTrue("Source and destination directories do not match.",
                   checkFiles(fs, "/destdat", files));
        
        FileStatus[] dststat = getFileStatus(fs, "/destdat", files);
        for(int i = 0; i < dststat.length; i++) {
          assertEquals("i=" + i, "u" + i, dststat[i].getOwner());
        }
        deldir(fs, "/destdat");
        deldir(fs, "/srcdat");
      }


      {//test preserving group
        MyFile[] files = createFiles(URI.create(nnUri), "/srcdat");
        FileStatus[] srcstat = getFileStatus(fs, "/srcdat", files);
        for(int i = 0; i < srcstat.length; i++) {
          fs.setOwner(srcstat[i].getPath(), null, "g" + i);
        }
        ToolRunner.run(new DistCp(conf),
            new String[]{"-pg", nnUri+"/srcdat", nnUri+"/destdat"});
        assertTrue("Source and destination directories do not match.",
                   checkFiles(fs, "/destdat", files));
        
        FileStatus[] dststat = getFileStatus(fs, "/destdat", files);
        for(int i = 0; i < dststat.length; i++) {
          assertEquals("i=" + i, "g" + i, dststat[i].getGroup());
        }
        deldir(fs, "/destdat");
        deldir(fs, "/srcdat");
      }


      {//test preserving mode
        MyFile[] files = createFiles(URI.create(nnUri), "/srcdat");
        FileStatus[] srcstat = getFileStatus(fs, "/srcdat", files);
        FsPermission[] permissions = new FsPermission[srcstat.length];
        for(int i = 0; i < srcstat.length; i++) {
          permissions[i] = new FsPermission((short)(i & 0666));
          fs.setPermission(srcstat[i].getPath(), permissions[i]);
        }


        ToolRunner.run(new DistCp(conf),
            new String[]{"-pp", nnUri+"/srcdat", nnUri+"/destdat"});
        assertTrue("Source and destination directories do not match.",
                   checkFiles(fs, "/destdat", files));
  
        FileStatus[] dststat = getFileStatus(fs, "/destdat", files);

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