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.

    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));     
      
      // single file update should skip copy if destination has the file already
      String[] args = {"-update", "file:///"+TEST_ROOT_DIR+"/srcdat/"+fname,
          "file:///"+TEST_ROOT_DIR+"/dest2/"+fname};
      Configuration conf = new Configuration();
      JobConf job = new JobConf(conf, DistCp.class);
      DistCp.Arguments distcpArgs = DistCp.Arguments.valueOf(args, conf);
      assertFalse("Single file update failed to skip copying even though the " 
          + "file exists at destination.", DistCp.setup(conf, job, distcpArgs));
      
      //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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      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), "/basedir/middle/srcdat");
        ToolRunner.run(new DistCp(conf), new String[] {
                                         "-basedir",
                                         "/basedir",
                                         namenode+"/basedir/middle/srcdat",
                                         namenode+"/destdat"});
        assertTrue("Source and destination directories do not match.",

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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);
        for(int i = 0; i < dststat.length; i++) {
          assertEquals("i=" + i, permissions[i], dststat[i].getPermission());
        }
        deldir(fs, "/destdat");
        deldir(fs, "/srcdat");
      }


      {//test preserving times
        MyFile[] files = createFiles(URI.create(nnUri), "/srcdat");
        fs.mkdirs(new Path("/srcdat/tmpf1"));
        fs.mkdirs(new Path("/srcdat/tmpf2"));
        FileStatus[] srcstat = getFileStatus(fs, "/srcdat", files);
        FsPermission[] permissions = new FsPermission[srcstat.length];
        for(int i = 0; i < srcstat.length; i++) {
          fs.setTimes(srcstat[i].getPath(), 40, 50);
        }


        ToolRunner.run(new DistCp(conf),
            new String[]{"-pt", nnUri+"/srcdat", nnUri+"/destdat"});


        FileStatus[] dststat = getFileStatus(fs, "/destdat", files);
        for(int i = 0; i < dststat.length; i++) {
          assertEquals("Modif. Time i=" + i, 40, dststat[i].getModificationTime());

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      for (MyFile f : files) {
        totsize += f.getSize();
      }
      Configuration job = mr.createJobConf();
      job.setLong("distcp.bytes.per.map", totsize / 3);
      ToolRunner.run(new DistCp(job),
          new String[] {"-m", "100",
                        "-log",
                        namenode+"/logs",
                        namenode+"/srcdat",
                        namenode+"/destdat"});
      assertTrue("Source and destination directories do not match.",
                 checkFiles(fs, "/destdat", files));


      String logdir = namenode + "/logs";
      System.out.println(execCmd(shell, "-lsr", logdir));
      FileStatus[] logs = fs.listStatus(new Path(logdir));
      // rare case where splits are exact, logs.length can be 4
      assertTrue("Unexpected map count, logs.length=" + logs.length,
          logs.length == 5 || logs.length == 4);


      deldir(fs, "/destdat");
      deldir(fs, "/logs");
      ToolRunner.run(new DistCp(job),
          new String[] {"-m", "1",
                        "-log",
                        namenode+"/logs",
                        namenode+"/srcdat",
                        namenode+"/destdat"});

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    MiniDFSCluster cluster = null;
    try {
      cluster = new MiniDFSCluster(conf, 2, true, null);
      final String nnUri = FileSystem.getDefaultUri(conf).toString();
      final FileSystem fs = FileSystem.get(URI.create(nnUri), conf);
      final DistCp distcp = new DistCp(conf);
      final FsShell shell = new FsShell(conf);  


      final String srcrootdir =  "/src_root";
      final Path srcrootpath = new Path(srcrootdir); 
      final String dstrootdir =  "/dst_root";

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      final Path srcrootpath = new Path(home, "src_root"); 
      final String srcrootdir =  srcrootpath.toString();
      final Path dstrootpath = new Path(home, "dst_root"); 
      final String dstrootdir =  dstrootpath.toString();
      final DistCp distcp = USER_UGI.doAs(new PrivilegedExceptionAction<DistCp>() {
        public DistCp run() {
          return new DistCp(userConf);
        }
      });


      FileSystem.mkdirs(fs, srcrootpath, new FsPermission((short)0700));
      final String[] args = {"hftp://"+httpAdd+srcrootdir, nnUri+dstrootdir};

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      cluster = new MiniDFSCluster(conf, 2, true, null);
      final URI nnURI = FileSystem.getDefaultUri(conf);
      final String nnUri = nnURI.toString();
      final FileSystem fs = FileSystem.get(URI.create(nnUri), conf);


      final DistCp distcp = new DistCp(conf);
      final FsShell shell = new FsShell(conf);  


      final String srcrootdir = "/src_root";
      final String dstrootdir = "/dst_root";

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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();
      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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    LOG.info(confPath + " found conf ? "
        + confPath.getFileSystem(conf).exists(confPath));
    conf.addResource(confPath);
        
    DistCp distCp = new CustomReplicator(conf, options);
    LOG.info("Started DistCp");
    distCp.execute();


        Path targetPath = options.getTargetPath();
        FileSystem fs = targetPath.getFileSystem(getConf());
        List<Path> inPaths = options.getSourcePaths();
        assert inPaths.size() == 1 : "Source paths more than 1 can't be handled";

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org.apache.hadoop.conf.Configuration

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org.apache.hadoop.fs.FileStatus

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