示例#1
0
  public void check(String addr) throws IOException {
    Configuration conf = new Configuration();
    File fhdfs = new File("hdfs-site.xml");
    InputStream inhdfs = new FileInputStream(fhdfs);
    File fcore = new File("core-site.xml");
    InputStream incore = new FileInputStream(fcore);
    conf.addResource(inhdfs);
    conf.addResource(incore);

    InetSocketAddress inetSocketAddress = new InetSocketAddress(addr, 9000);
    DFSClient client = new DFSClient(inetSocketAddress, conf);

    if (client.getMissingBlocksCount() > 0) {
      System.out.println("[ERROR] missing block count > 0");
      this.alert("[" + addr + "-HDFS检查]", "missing block个数大于0");
    } else {
      System.out.println("[INFO] there is no missing block count in cluster.");
    }

    DatanodeInfo[] datanodeInfos = client.datanodeReport(HdfsConstants.DatanodeReportType.DEAD);
    if (datanodeInfos.length > 0) {
      String ips = "";
      for (DatanodeInfo info : datanodeInfos) {
        ips += info.getIpAddr() + ";";
      }
      System.out.println("[ERROR] dead node ips is : " + ips);
      this.alert("[" + addr + "-HDFS检查]", "DEAD node个数大于0");
    } else {
      System.out.println("[INFO] dead node size is 0.");
    }

    org.apache.hadoop.fs.Path path = new Path(this.hdfsPath);
    FileSystem fs = null;
    FSDataOutputStream output = null;
    try {
      fs = path.getFileSystem(conf);
      if (fs.exists(path)) {
        System.out.println("[INFO] " + hdfsPath + " already exists.");
        fs.delete(path, false);
      }

      output = fs.create(path);
      for (String line : contents) {
        output.write(line.getBytes("UTF-8"));
        output.flush();
      }
    } catch (IOException e) {
      e.printStackTrace();
      System.out.println("[ERROR] write content failed.");
      this.alert("[" + addr + "-HDFS检查]", "HDFS可用性异常,删除写入文件失败");
    } finally {
      try {
        output.close();
        System.out.println("[INFO] delete and write file success.");
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    client.close();
  }
示例#2
0
  private void onGetFileChecksum(ChannelHandlerContext ctx) throws IOException {
    MD5MD5CRC32FileChecksum checksum = null;
    final String nnId = params.namenodeId();
    DFSClient dfsclient = newDfsClient(nnId, conf);
    try {
      checksum = dfsclient.getFileChecksum(path, Long.MAX_VALUE);
      dfsclient.close();
      dfsclient = null;
    } finally {
      IOUtils.cleanup(LOG, dfsclient);
    }
    final byte[] js = JsonUtil.toJsonString(checksum).getBytes(Charsets.UTF_8);
    DefaultFullHttpResponse resp =
        new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(js));

    resp.headers().set(CONTENT_TYPE, APPLICATION_JSON_UTF8);
    resp.headers().set(CONTENT_LENGTH, js.length);
    resp.headers().set(CONNECTION, CLOSE);
    ctx.writeAndFlush(resp).addListener(ChannelFutureListener.CLOSE);
  }
示例#3
0
  @SuppressWarnings("unchecked")
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    final String path = ServletUtil.getDecodedPath(request, "/streamFile");
    final String rawPath = ServletUtil.getRawPath(request, "/streamFile");
    final String filename = JspHelper.validatePath(path);
    final String rawFilename = JspHelper.validatePath(rawPath);
    if (filename == null) {
      response.setContentType("text/plain");
      PrintWriter out = response.getWriter();
      out.print("Invalid input");
      return;
    }

    Enumeration<String> reqRanges = request.getHeaders("Range");
    if (reqRanges != null && !reqRanges.hasMoreElements()) {
      reqRanges = null;
    }

    DFSClient dfs;
    try {
      dfs = getDFSClient(request);
    } catch (InterruptedException e) {
      response.sendError(400, e.getMessage());
      return;
    }

    DFSInputStream in = null;
    OutputStream out = null;

    try {
      in = dfs.open(filename);
      out = response.getOutputStream();
      final long fileLen = in.getFileLength();
      if (reqRanges != null) {
        List<InclusiveByteRange> ranges = InclusiveByteRange.satisfiableRanges(reqRanges, fileLen);
        StreamFile.sendPartialData(in, out, response, fileLen, ranges);
      } else {
        // No ranges, so send entire file
        response.setHeader("Content-Disposition", "attachment; filename=\"" + rawFilename + "\"");
        response.setContentType("application/octet-stream");
        response.setHeader(CONTENT_LENGTH, "" + fileLen);
        StreamFile.copyFromOffset(in, out, 0L, fileLen);
      }
      in.close();
      in = null;
      out.close();
      out = null;
      dfs.close();
      dfs = null;
    } catch (IOException ioe) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("response.isCommitted()=" + response.isCommitted(), ioe);
      }
      throw ioe;
    } finally {
      IOUtils.cleanup(LOG, in);
      IOUtils.cleanup(LOG, out);
      IOUtils.cleanup(LOG, dfs);
    }
  }
  protected void doTestRead(Configuration conf, MiniDFSCluster cluster, boolean isStriped)
      throws Exception {
    final int numDataNodes = cluster.getDataNodes().size();
    final NameNode nn = cluster.getNameNode();
    final NamenodeProtocols nnProto = nn.getRpcServer();
    final BlockManager bm = nn.getNamesystem().getBlockManager();
    final BlockTokenSecretManager sm = bm.getBlockTokenSecretManager();

    // set a short token lifetime (1 second) initially
    SecurityTestUtil.setBlockTokenLifetime(sm, 1000L);

    Path fileToRead = new Path(FILE_TO_READ);
    FileSystem fs = cluster.getFileSystem();
    byte[] expected = generateBytes(FILE_SIZE);
    createFile(fs, fileToRead, expected);

    /*
     * setup for testing expiration handling of cached tokens
     */

    // read using blockSeekTo(). Acquired tokens are cached in in1
    FSDataInputStream in1 = fs.open(fileToRead);
    assertTrue(checkFile1(in1, expected));
    // read using blockSeekTo(). Acquired tokens are cached in in2
    FSDataInputStream in2 = fs.open(fileToRead);
    assertTrue(checkFile1(in2, expected));
    // read using fetchBlockByteRange(). Acquired tokens are cached in in3
    FSDataInputStream in3 = fs.open(fileToRead);
    assertTrue(checkFile2(in3, expected));

    /*
     * testing READ interface on DN using a BlockReader
     */
    DFSClient client = null;
    try {
      client = new DFSClient(new InetSocketAddress("localhost", cluster.getNameNodePort()), conf);
    } finally {
      if (client != null) client.close();
    }
    List<LocatedBlock> locatedBlocks =
        nnProto.getBlockLocations(FILE_TO_READ, 0, FILE_SIZE).getLocatedBlocks();
    LocatedBlock lblock = locatedBlocks.get(0); // first block
    // verify token is not expired
    assertFalse(isBlockTokenExpired(lblock));
    // read with valid token, should succeed
    tryRead(conf, lblock, true);

    /*
     * wait till myToken and all cached tokens in in1, in2 and in3 expire
     */

    while (!isBlockTokenExpired(lblock)) {
      try {
        Thread.sleep(10);
      } catch (InterruptedException ignored) {
      }
    }

    /*
     * continue testing READ interface on DN using a BlockReader
     */

    // verify token is expired
    assertTrue(isBlockTokenExpired(lblock));
    // read should fail
    tryRead(conf, lblock, false);
    // use a valid new token
    bm.setBlockToken(lblock, BlockTokenIdentifier.AccessMode.READ);
    // read should succeed
    tryRead(conf, lblock, true);
    // use a token with wrong blockID
    long rightId = lblock.getBlock().getBlockId();
    long wrongId = rightId + 1;
    lblock.getBlock().setBlockId(wrongId);
    bm.setBlockToken(lblock, BlockTokenIdentifier.AccessMode.READ);
    lblock.getBlock().setBlockId(rightId);
    // read should fail
    tryRead(conf, lblock, false);
    // use a token with wrong access modes
    bm.setBlockToken(lblock, BlockTokenIdentifier.AccessMode.WRITE);
    // read should fail
    tryRead(conf, lblock, false);

    // set a long token lifetime for future tokens
    SecurityTestUtil.setBlockTokenLifetime(sm, 600 * 1000L);

    /*
     * testing that when cached tokens are expired, DFSClient will re-fetch
     * tokens transparently for READ.
     */

    // confirm all tokens cached in in1 are expired by now
    List<LocatedBlock> lblocks = DFSTestUtil.getAllBlocks(in1);
    for (LocatedBlock blk : lblocks) {
      assertTrue(isBlockTokenExpired(blk));
    }
    // verify blockSeekTo() is able to re-fetch token transparently
    in1.seek(0);
    assertTrue(checkFile1(in1, expected));

    // confirm all tokens cached in in2 are expired by now
    List<LocatedBlock> lblocks2 = DFSTestUtil.getAllBlocks(in2);
    for (LocatedBlock blk : lblocks2) {
      assertTrue(isBlockTokenExpired(blk));
    }
    // verify blockSeekTo() is able to re-fetch token transparently (testing
    // via another interface method)
    if (isStriped) {
      // striped block doesn't support seekToNewSource
      in2.seek(0);
    } else {
      assertTrue(in2.seekToNewSource(0));
    }
    assertTrue(checkFile1(in2, expected));

    // confirm all tokens cached in in3 are expired by now
    List<LocatedBlock> lblocks3 = DFSTestUtil.getAllBlocks(in3);
    for (LocatedBlock blk : lblocks3) {
      assertTrue(isBlockTokenExpired(blk));
    }
    // verify fetchBlockByteRange() is able to re-fetch token transparently
    assertTrue(checkFile2(in3, expected));

    /*
     * testing that after datanodes are restarted on the same ports, cached
     * tokens should still work and there is no need to fetch new tokens from
     * namenode. This test should run while namenode is down (to make sure no
     * new tokens can be fetched from namenode).
     */

    // restart datanodes on the same ports that they currently use
    assertTrue(cluster.restartDataNodes(true));
    cluster.waitActive();
    assertEquals(numDataNodes, cluster.getDataNodes().size());
    cluster.shutdownNameNode(0);

    // confirm tokens cached in in1 are still valid
    lblocks = DFSTestUtil.getAllBlocks(in1);
    for (LocatedBlock blk : lblocks) {
      assertFalse(isBlockTokenExpired(blk));
    }
    // verify blockSeekTo() still works (forced to use cached tokens)
    in1.seek(0);
    assertTrue(checkFile1(in1, expected));

    // confirm tokens cached in in2 are still valid
    lblocks2 = DFSTestUtil.getAllBlocks(in2);
    for (LocatedBlock blk : lblocks2) {
      assertFalse(isBlockTokenExpired(blk));
    }

    // verify blockSeekTo() still works (forced to use cached tokens)
    if (isStriped) {
      in2.seek(0);
    } else {
      in2.seekToNewSource(0);
    }
    assertTrue(checkFile1(in2, expected));

    // confirm tokens cached in in3 are still valid
    lblocks3 = DFSTestUtil.getAllBlocks(in3);
    for (LocatedBlock blk : lblocks3) {
      assertFalse(isBlockTokenExpired(blk));
    }
    // verify fetchBlockByteRange() still works (forced to use cached tokens)
    assertTrue(checkFile2(in3, expected));

    /*
     * testing that when namenode is restarted, cached tokens should still
     * work and there is no need to fetch new tokens from namenode. Like the
     * previous test, this test should also run while namenode is down. The
     * setup for this test depends on the previous test.
     */

    // restart the namenode and then shut it down for test
    cluster.restartNameNode(0);
    cluster.shutdownNameNode(0);

    // verify blockSeekTo() still works (forced to use cached tokens)
    in1.seek(0);
    assertTrue(checkFile1(in1, expected));
    // verify again blockSeekTo() still works (forced to use cached tokens)
    if (isStriped) {
      in2.seek(0);
    } else {
      in2.seekToNewSource(0);
    }
    assertTrue(checkFile1(in2, expected));

    // verify fetchBlockByteRange() still works (forced to use cached tokens)
    assertTrue(checkFile2(in3, expected));

    /*
     * testing that after both namenode and datanodes got restarted (namenode
     * first, followed by datanodes), DFSClient can't access DN without
     * re-fetching tokens and is able to re-fetch tokens transparently. The
     * setup of this test depends on the previous test.
     */

    // restore the cluster and restart the datanodes for test
    cluster.restartNameNode(0);
    assertTrue(cluster.restartDataNodes(true));
    cluster.waitActive();
    assertEquals(numDataNodes, cluster.getDataNodes().size());

    // shutdown namenode so that DFSClient can't get new tokens from namenode
    cluster.shutdownNameNode(0);

    // verify blockSeekTo() fails (cached tokens become invalid)
    in1.seek(0);
    assertFalse(checkFile1(in1, expected));
    // verify fetchBlockByteRange() fails (cached tokens become invalid)
    assertFalse(checkFile2(in3, expected));

    // restart the namenode to allow DFSClient to re-fetch tokens
    cluster.restartNameNode(0);
    // verify blockSeekTo() works again (by transparently re-fetching
    // tokens from namenode)
    in1.seek(0);
    assertTrue(checkFile1(in1, expected));
    if (isStriped) {
      in2.seek(0);
    } else {
      in2.seekToNewSource(0);
    }
    assertTrue(checkFile1(in2, expected));
    // verify fetchBlockByteRange() works again (by transparently
    // re-fetching tokens from namenode)
    assertTrue(checkFile2(in3, expected));

    /*
     * testing that when datanodes are restarted on different ports, DFSClient
     * is able to re-fetch tokens transparently to connect to them
     */

    // restart datanodes on newly assigned ports
    assertTrue(cluster.restartDataNodes(false));
    cluster.waitActive();
    assertEquals(numDataNodes, cluster.getDataNodes().size());
    // verify blockSeekTo() is able to re-fetch token transparently
    in1.seek(0);
    assertTrue(checkFile1(in1, expected));
    // verify blockSeekTo() is able to re-fetch token transparently
    if (isStriped) {
      in2.seek(0);
    } else {
      in2.seekToNewSource(0);
    }
    assertTrue(checkFile1(in2, expected));
    // verify fetchBlockByteRange() is able to re-fetch token transparently
    assertTrue(checkFile2(in3, expected));
  }
  private void copyBlocksToLostFound(String parent, HdfsFileStatus file, LocatedBlocks blocks)
      throws IOException {
    final DFSClient dfs = new DFSClient(NameNode.getAddress(conf), conf);
    final String fullName = file.getFullName(parent);
    OutputStream fos = null;
    try {
      if (!lfInited) {
        lostFoundInit(dfs);
      }
      if (!lfInitedOk) {
        throw new IOException("failed to initialize lost+found");
      }
      String target = lostFound + fullName;
      if (hdfsPathExists(target)) {
        LOG.warn(
            "Fsck: can't copy the remains of "
                + fullName
                + " to "
                + "lost+found, because "
                + target
                + " already exists.");
        return;
      }
      if (!namenode.getRpcServer().mkdirs(target, file.getPermission(), true)) {
        throw new IOException("failed to create directory " + target);
      }
      // create chains
      int chain = 0;
      boolean copyError = false;
      for (LocatedBlock lBlk : blocks.getLocatedBlocks()) {
        LocatedBlock lblock = lBlk;
        DatanodeInfo[] locs = lblock.getLocations();
        if (locs == null || locs.length == 0) {
          if (fos != null) {
            fos.flush();
            fos.close();
            fos = null;
          }
          continue;
        }
        if (fos == null) {
          fos = dfs.create(target + "/" + chain, true);
          if (fos == null) {
            throw new IOException(
                "Failed to copy " + fullName + " to /lost+found: could not store chain " + chain);
          }
          chain++;
        }

        // copy the block. It's a pity it's not abstracted from DFSInputStream ...
        try {
          copyBlock(dfs, lblock, fos);
        } catch (Exception e) {
          LOG.error("Fsck: could not copy block " + lblock.getBlock() + " to " + target, e);
          fos.flush();
          fos.close();
          fos = null;
          internalError = true;
          copyError = true;
        }
      }
      if (copyError) {
        LOG.warn(
            "Fsck: there were errors copying the remains of the "
                + "corrupted file "
                + fullName
                + " to /lost+found");
      } else {
        LOG.info("Fsck: copied the remains of the corrupted file " + fullName + " to /lost+found");
      }
    } catch (Exception e) {
      LOG.error("copyBlocksToLostFound: error processing " + fullName, e);
      internalError = true;
    } finally {
      if (fos != null) fos.close();
      dfs.close();
    }
  }
  static void generateDirectoryStructure(
      JspWriter out, HttpServletRequest req, HttpServletResponse resp, Configuration conf)
      throws IOException, InterruptedException {
    final String dir =
        JspHelper.validatePath(StringEscapeUtils.unescapeHtml(req.getParameter("dir")));
    if (dir == null) {
      out.print("Invalid input");
      return;
    }
    String tokenString = req.getParameter(JspHelper.DELEGATION_PARAMETER_NAME);
    UserGroupInformation ugi = JspHelper.getUGI(req, conf);
    String namenodeInfoPortStr = req.getParameter("namenodeInfoPort");
    int namenodeInfoPort = -1;
    if (namenodeInfoPortStr != null) namenodeInfoPort = Integer.parseInt(namenodeInfoPortStr);
    final String nnAddr = req.getParameter(JspHelper.NAMENODE_ADDRESS);
    if (nnAddr == null) {
      out.print(JspHelper.NAMENODE_ADDRESS + " url param is null");
      return;
    }

    DFSClient dfs = getDFSClient(ugi, nnAddr, conf);
    String target = dir;
    final HdfsFileStatus targetStatus = dfs.getFileInfo(target);
    if (targetStatus == null) { // not exists
      out.print("<h3>File or directory : " + target + " does not exist</h3>");
      JspHelper.printGotoForm(out, namenodeInfoPort, tokenString, target, nnAddr);
    } else {
      if (!targetStatus.isDir()) { // a file
        List<LocatedBlock> blocks =
            dfs.getNamenode().getBlockLocations(dir, 0, 1).getLocatedBlocks();

        LocatedBlock firstBlock = null;
        DatanodeInfo[] locations = null;
        if (blocks.size() > 0) {
          firstBlock = blocks.get(0);
          locations = firstBlock.getLocations();
        }
        if (locations == null || locations.length == 0) {
          out.print("Empty file");
        } else {
          DatanodeInfo chosenNode = JspHelper.bestNode(firstBlock, conf);
          String fqdn = canonicalize(chosenNode.getIpAddr());
          int datanodePort = chosenNode.getXferPort();
          String redirectLocation =
              "http://"
                  + fqdn
                  + ":"
                  + chosenNode.getInfoPort()
                  + "/browseBlock.jsp?blockId="
                  + firstBlock.getBlock().getBlockId()
                  + "&blockSize="
                  + firstBlock.getBlock().getNumBytes()
                  + "&genstamp="
                  + firstBlock.getBlock().getGenerationStamp()
                  + "&filename="
                  + URLEncoder.encode(dir, "UTF-8")
                  + "&datanodePort="
                  + datanodePort
                  + "&namenodeInfoPort="
                  + namenodeInfoPort
                  + JspHelper.getDelegationTokenUrlParam(tokenString)
                  + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr);
          resp.sendRedirect(redirectLocation);
        }
        return;
      }
      // directory
      // generate a table and dump the info
      String[] headings = {
        "Name",
        "Type",
        "Size",
        "Replication",
        "Block Size",
        "Modification Time",
        "Permission",
        "Owner",
        "Group"
      };
      out.print("<h3>Contents of directory ");
      JspHelper.printPathWithLinks(dir, out, namenodeInfoPort, tokenString, nnAddr);
      out.print("</h3><hr>");
      JspHelper.printGotoForm(out, namenodeInfoPort, tokenString, dir, nnAddr);
      out.print("<hr>");

      File f = new File(dir);
      String parent;
      if ((parent = f.getParent()) != null)
        out.print(
            "<a href=\""
                + req.getRequestURL()
                + "?dir="
                + parent
                + "&namenodeInfoPort="
                + namenodeInfoPort
                + JspHelper.getDelegationTokenUrlParam(tokenString)
                + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr)
                + "\">Go to parent directory</a><br>");

      DirectoryListing thisListing = dfs.listPaths(target, HdfsFileStatus.EMPTY_NAME);
      if (thisListing == null || thisListing.getPartialListing().length == 0) {
        out.print("Empty directory");
      } else {
        JspHelper.addTableHeader(out);
        int row = 0;
        JspHelper.addTableRow(out, headings, row++);
        String cols[] = new String[headings.length];
        do {
          HdfsFileStatus[] files = thisListing.getPartialListing();
          for (int i = 0; i < files.length; i++) {
            String localFileName = files[i].getLocalName();
            // Get the location of the first block of the file
            if (!files[i].isDir()) {
              cols[1] = "file";
              cols[2] = StringUtils.byteDesc(files[i].getLen());
              cols[3] = Short.toString(files[i].getReplication());
              cols[4] = StringUtils.byteDesc(files[i].getBlockSize());
            } else {
              cols[1] = "dir";
              cols[2] = "";
              cols[3] = "";
              cols[4] = "";
            }
            String datanodeUrl =
                req.getRequestURL()
                    + "?dir="
                    + URLEncoder.encode(files[i].getFullName(target), "UTF-8")
                    + "&namenodeInfoPort="
                    + namenodeInfoPort
                    + JspHelper.getDelegationTokenUrlParam(tokenString)
                    + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr);
            cols[0] = "<a href=\"" + datanodeUrl + "\">" + localFileName + "</a>";
            cols[5] = lsDateFormat.format(new Date((files[i].getModificationTime())));
            cols[6] = files[i].getPermission().toString();
            cols[7] = files[i].getOwner();
            cols[8] = files[i].getGroup();
            JspHelper.addTableRow(out, cols, row++);
          }
          if (!thisListing.hasMore()) {
            break;
          }
          thisListing = dfs.listPaths(target, thisListing.getLastName());
        } while (thisListing != null);
        JspHelper.addTableFooter(out);
      }
    }
    out.print(
        "<br><a href=\"http://"
            + canonicalize(nnAddr)
            + ":"
            + namenodeInfoPort
            + "/dfshealth.jsp\">Go back to DFS home</a>");
    dfs.close();
  }
  static void generateFileChunksForTail(JspWriter out, HttpServletRequest req, Configuration conf)
      throws IOException, InterruptedException {
    String referrer = null;
    boolean noLink = false;
    try {
      referrer = new URL(req.getParameter("referrer")).toString();
    } catch (IOException e) {
      referrer = null;
      noLink = true;
    }

    final String filename =
        JspHelper.validatePath(StringEscapeUtils.unescapeHtml(req.getParameter("filename")));
    if (filename == null) {
      out.print("Invalid input (file name absent)");
      return;
    }
    String tokenString = req.getParameter(JspHelper.DELEGATION_PARAMETER_NAME);
    UserGroupInformation ugi = JspHelper.getUGI(req, conf);

    String namenodeInfoPortStr = req.getParameter("namenodeInfoPort");
    String nnAddr = req.getParameter(JspHelper.NAMENODE_ADDRESS);
    int namenodeInfoPort = -1;
    if (namenodeInfoPortStr != null) namenodeInfoPort = Integer.parseInt(namenodeInfoPortStr);

    final int chunkSizeToView =
        JspHelper.string2ChunkSizeToView(
            req.getParameter("chunkSizeToView"), getDefaultChunkSize(conf));

    if (!noLink) {
      out.print("<h3>Tail of File: ");
      JspHelper.printPathWithLinks(filename, out, namenodeInfoPort, tokenString, nnAddr);
      out.print("</h3><hr>");
      out.print("<a href=\"" + referrer + "\">Go Back to File View</a><hr>");
    } else {
      out.print("<h3>" + filename + "</h3>");
    }
    out.print("<b>Chunk size to view (in bytes, up to file's DFS block size): </b>");
    out.print(
        "<input type=\"text\" name=\"chunkSizeToView\" value="
            + chunkSizeToView
            + " size=10 maxlength=10>");
    out.print("&nbsp;&nbsp;<input type=\"submit\" name=\"submit\" value=\"Refresh\"><hr>");
    out.print("<input type=\"hidden\" name=\"filename\" value=\"" + filename + "\">");
    out.print(
        "<input type=\"hidden\" name=\"namenodeInfoPort\" value=\"" + namenodeInfoPort + "\">");
    out.print(
        "<input type=\"hidden\" name=\""
            + JspHelper.NAMENODE_ADDRESS
            + "\" value=\""
            + nnAddr
            + "\">");
    if (!noLink) out.print("<input type=\"hidden\" name=\"referrer\" value=\"" + referrer + "\">");

    // fetch the block from the datanode that has the last block for this file
    final DFSClient dfs = getDFSClient(ugi, nnAddr, conf);
    List<LocatedBlock> blocks =
        dfs.getNamenode().getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
    if (blocks == null || blocks.size() == 0) {
      out.print("No datanodes contain blocks of file " + filename);
      dfs.close();
      return;
    }
    LocatedBlock lastBlk = blocks.get(blocks.size() - 1);
    String poolId = lastBlk.getBlock().getBlockPoolId();
    long blockSize = lastBlk.getBlock().getNumBytes();
    long blockId = lastBlk.getBlock().getBlockId();
    Token<BlockTokenIdentifier> accessToken = lastBlk.getBlockToken();
    long genStamp = lastBlk.getBlock().getGenerationStamp();
    DatanodeInfo chosenNode;
    try {
      chosenNode = JspHelper.bestNode(lastBlk, conf);
    } catch (IOException e) {
      out.print(e.toString());
      dfs.close();
      return;
    }
    InetSocketAddress addr = NetUtils.createSocketAddr(chosenNode.getXferAddr());
    // view the last chunkSizeToView bytes while Tailing
    final long startOffset = blockSize >= chunkSizeToView ? blockSize - chunkSizeToView : 0;

    out.print("<textarea cols=\"100\" rows=\"25\" wrap=\"virtual\" style=\"width:100%\" READONLY>");
    JspHelper.streamBlockInAscii(
        addr,
        poolId,
        blockId,
        accessToken,
        genStamp,
        blockSize,
        startOffset,
        chunkSizeToView,
        out,
        conf);
    out.print("</textarea>");
    dfs.close();
  }
  static void generateFileChunks(JspWriter out, HttpServletRequest req, Configuration conf)
      throws IOException, InterruptedException {
    long startOffset = 0;
    int datanodePort = 0;

    final String namenodeInfoPortStr = req.getParameter("namenodeInfoPort");
    final String nnAddr = req.getParameter(JspHelper.NAMENODE_ADDRESS);
    if (nnAddr == null) {
      out.print(JspHelper.NAMENODE_ADDRESS + " url param is null");
      return;
    }
    final String tokenString = req.getParameter(JspHelper.DELEGATION_PARAMETER_NAME);
    UserGroupInformation ugi = JspHelper.getUGI(req, conf);
    int namenodeInfoPort = -1;
    if (namenodeInfoPortStr != null) namenodeInfoPort = Integer.parseInt(namenodeInfoPortStr);

    final String filename =
        JspHelper.validatePath(StringEscapeUtils.unescapeHtml(req.getParameter("filename")));
    if (filename == null) {
      out.print("Invalid input (filename absent)");
      return;
    }

    final Long blockId = JspHelper.validateLong(req.getParameter("blockId"));
    if (blockId == null) {
      out.print("Invalid input (blockId absent)");
      return;
    }

    final DFSClient dfs = getDFSClient(ugi, nnAddr, conf);

    String bpid = null;
    Token<BlockTokenIdentifier> blockToken = BlockTokenSecretManager.DUMMY_TOKEN;
    List<LocatedBlock> blks =
        dfs.getNamenode().getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
    if (blks == null || blks.size() == 0) {
      out.print("Can't locate file blocks");
      dfs.close();
      return;
    }

    boolean needBlockToken =
        conf.getBoolean(
            DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_KEY,
            DFSConfigKeys.DFS_BLOCK_ACCESS_TOKEN_ENABLE_DEFAULT);

    for (int i = 0; i < blks.size(); i++) {
      if (blks.get(i).getBlock().getBlockId() == blockId) {
        bpid = blks.get(i).getBlock().getBlockPoolId();
        if (needBlockToken) {
          blockToken = blks.get(i).getBlockToken();
        }
        break;
      }
    }

    final Long genStamp = JspHelper.validateLong(req.getParameter("genstamp"));
    if (genStamp == null) {
      out.print("Invalid input (genstamp absent)");
      return;
    }

    long blockSize = 0;
    final String blockSizeStr = req.getParameter("blockSize");
    if (blockSizeStr == null) {
      out.print("Invalid input (blockSize absent)");
      return;
    }
    blockSize = Long.parseLong(blockSizeStr);

    final int chunkSizeToView =
        JspHelper.string2ChunkSizeToView(
            req.getParameter("chunkSizeToView"), getDefaultChunkSize(conf));

    String startOffsetStr = req.getParameter("startOffset");
    if (startOffsetStr == null || Long.parseLong(startOffsetStr) < 0) startOffset = 0;
    else startOffset = Long.parseLong(startOffsetStr);

    String datanodePortStr = req.getParameter("datanodePort");
    if (datanodePortStr == null) {
      out.print("Invalid input (datanodePort absent)");
      return;
    }
    datanodePort = Integer.parseInt(datanodePortStr);
    out.print("<h3>File: ");
    JspHelper.printPathWithLinks(filename, out, namenodeInfoPort, tokenString, nnAddr);
    out.print("</h3><hr>");
    String parent = new File(filename).getParent();
    JspHelper.printGotoForm(out, namenodeInfoPort, tokenString, parent, nnAddr);
    out.print("<hr>");
    out.print(
        "<a href=\"http://"
            + req.getServerName()
            + ":"
            + req.getServerPort()
            + "/browseDirectory.jsp?dir="
            + URLEncoder.encode(parent, "UTF-8")
            + "&namenodeInfoPort="
            + namenodeInfoPort
            + JspHelper.getDelegationTokenUrlParam(tokenString)
            + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr)
            + "\"><i>Go back to dir listing</i></a><br>");
    out.print("<a href=\"#viewOptions\">Advanced view/download options</a><br>");
    out.print("<hr>");

    // Determine the prev & next blocks
    long nextStartOffset = 0;
    long nextBlockSize = 0;
    String nextBlockIdStr = null;
    String nextGenStamp = null;
    String nextHost = req.getServerName();
    int nextPort = req.getServerPort();
    int nextDatanodePort = datanodePort;
    // determine data for the next link
    if (startOffset + chunkSizeToView >= blockSize) {
      // we have to go to the next block from this point onwards
      List<LocatedBlock> blocks =
          dfs.getNamenode().getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
      for (int i = 0; i < blocks.size(); i++) {
        if (blocks.get(i).getBlock().getBlockId() == blockId) {
          if (i != blocks.size() - 1) {
            LocatedBlock nextBlock = blocks.get(i + 1);
            nextBlockIdStr = Long.toString(nextBlock.getBlock().getBlockId());
            nextGenStamp = Long.toString(nextBlock.getBlock().getGenerationStamp());
            nextStartOffset = 0;
            nextBlockSize = nextBlock.getBlock().getNumBytes();
            DatanodeInfo d = JspHelper.bestNode(nextBlock, conf);
            nextDatanodePort = d.getXferPort();
            nextHost = d.getIpAddr();
            nextPort = d.getInfoPort();
          }
        }
      }
    } else {
      // we are in the same block
      nextBlockIdStr = blockId.toString();
      nextStartOffset = startOffset + chunkSizeToView;
      nextBlockSize = blockSize;
      nextGenStamp = genStamp.toString();
    }
    String nextUrl = null;
    if (nextBlockIdStr != null) {
      nextUrl =
          "http://"
              + canonicalize(nextHost)
              + ":"
              + nextPort
              + "/browseBlock.jsp?blockId="
              + nextBlockIdStr
              + "&blockSize="
              + nextBlockSize
              + "&startOffset="
              + nextStartOffset
              + "&genstamp="
              + nextGenStamp
              + "&filename="
              + URLEncoder.encode(filename, "UTF-8")
              + "&chunkSizeToView="
              + chunkSizeToView
              + "&datanodePort="
              + nextDatanodePort
              + "&namenodeInfoPort="
              + namenodeInfoPort
              + JspHelper.getDelegationTokenUrlParam(tokenString)
              + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr);
      out.print("<a href=\"" + nextUrl + "\">View Next chunk</a>&nbsp;&nbsp;");
    }
    // determine data for the prev link
    String prevBlockIdStr = null;
    String prevGenStamp = null;
    long prevStartOffset = 0;
    long prevBlockSize = 0;
    String prevHost = req.getServerName();
    int prevPort = req.getServerPort();
    int prevDatanodePort = datanodePort;
    if (startOffset == 0) {
      List<LocatedBlock> blocks =
          dfs.getNamenode().getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
      for (int i = 0; i < blocks.size(); i++) {
        if (blocks.get(i).getBlock().getBlockId() == blockId) {
          if (i != 0) {
            LocatedBlock prevBlock = blocks.get(i - 1);
            prevBlockIdStr = Long.toString(prevBlock.getBlock().getBlockId());
            prevGenStamp = Long.toString(prevBlock.getBlock().getGenerationStamp());
            prevStartOffset = prevBlock.getBlock().getNumBytes() - chunkSizeToView;
            if (prevStartOffset < 0) prevStartOffset = 0;
            prevBlockSize = prevBlock.getBlock().getNumBytes();
            DatanodeInfo d = JspHelper.bestNode(prevBlock, conf);
            prevDatanodePort = d.getXferPort();
            prevHost = d.getIpAddr();
            prevPort = d.getInfoPort();
          }
        }
      }
    } else {
      // we are in the same block
      prevBlockIdStr = blockId.toString();
      prevStartOffset = startOffset - chunkSizeToView;
      if (prevStartOffset < 0) prevStartOffset = 0;
      prevBlockSize = blockSize;
      prevGenStamp = genStamp.toString();
    }

    String prevUrl = null;
    if (prevBlockIdStr != null) {
      prevUrl =
          "http://"
              + canonicalize(prevHost)
              + ":"
              + prevPort
              + "/browseBlock.jsp?blockId="
              + prevBlockIdStr
              + "&blockSize="
              + prevBlockSize
              + "&startOffset="
              + prevStartOffset
              + "&filename="
              + URLEncoder.encode(filename, "UTF-8")
              + "&chunkSizeToView="
              + chunkSizeToView
              + "&genstamp="
              + prevGenStamp
              + "&datanodePort="
              + prevDatanodePort
              + "&namenodeInfoPort="
              + namenodeInfoPort
              + JspHelper.getDelegationTokenUrlParam(tokenString)
              + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr);
      out.print("<a href=\"" + prevUrl + "\">View Prev chunk</a>&nbsp;&nbsp;");
    }
    out.print("<hr>");
    out.print("<textarea cols=\"100\" rows=\"25\" wrap=\"virtual\" style=\"width:100%\" READONLY>");
    try {
      JspHelper.streamBlockInAscii(
          new InetSocketAddress(req.getServerName(), datanodePort),
          bpid,
          blockId,
          blockToken,
          genStamp,
          blockSize,
          startOffset,
          chunkSizeToView,
          out,
          conf);
    } catch (Exception e) {
      out.print(e);
    }
    out.print("</textarea>");
    dfs.close();
  }
  static void generateFileDetails(JspWriter out, HttpServletRequest req, Configuration conf)
      throws IOException, InterruptedException {

    long startOffset = 0;
    int datanodePort;

    final Long blockId = JspHelper.validateLong(req.getParameter("blockId"));
    if (blockId == null) {
      out.print("Invalid input (blockId absent)");
      return;
    }
    String tokenString = req.getParameter(JspHelper.DELEGATION_PARAMETER_NAME);
    UserGroupInformation ugi = JspHelper.getUGI(req, conf);

    String datanodePortStr = req.getParameter("datanodePort");
    if (datanodePortStr == null) {
      out.print("Invalid input (datanodePort absent)");
      return;
    }
    datanodePort = Integer.parseInt(datanodePortStr);

    final Long genStamp = JspHelper.validateLong(req.getParameter("genstamp"));
    if (genStamp == null) {
      out.print("Invalid input (genstamp absent)");
      return;
    }
    String namenodeInfoPortStr = req.getParameter("namenodeInfoPort");
    int namenodeInfoPort = -1;
    if (namenodeInfoPortStr != null) namenodeInfoPort = Integer.parseInt(namenodeInfoPortStr);
    final String nnAddr = req.getParameter(JspHelper.NAMENODE_ADDRESS);
    if (nnAddr == null) {
      out.print(JspHelper.NAMENODE_ADDRESS + " url param is null");
      return;
    }

    final int chunkSizeToView =
        JspHelper.string2ChunkSizeToView(
            req.getParameter("chunkSizeToView"), getDefaultChunkSize(conf));

    String startOffsetStr = req.getParameter("startOffset");
    if (startOffsetStr == null || Long.parseLong(startOffsetStr) < 0) startOffset = 0;
    else startOffset = Long.parseLong(startOffsetStr);

    String path = StringEscapeUtils.unescapeHtml(req.getParameter("filename"));
    if (path == null) {
      path = req.getPathInfo() == null ? "/" : req.getPathInfo();
    }
    final String filename = JspHelper.validatePath(path);
    if (filename == null) {
      out.print("Invalid input");
      return;
    }

    final String blockSizeStr = req.getParameter("blockSize");
    if (blockSizeStr == null || blockSizeStr.length() == 0) {
      out.print("Invalid input");
      return;
    }
    long blockSize = Long.parseLong(blockSizeStr);

    final DFSClient dfs = getDFSClient(ugi, nnAddr, conf);
    List<LocatedBlock> blocks =
        dfs.getNamenode().getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
    // Add the various links for looking at the file contents
    // URL for downloading the full file
    String downloadUrl =
        "http://"
            + req.getServerName()
            + ":"
            + req.getServerPort()
            + "/streamFile"
            + ServletUtil.encodePath(filename)
            + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr, true)
            + JspHelper.getDelegationTokenUrlParam(tokenString);
    out.print("<a name=\"viewOptions\"></a>");
    out.print("<a href=\"" + downloadUrl + "\">Download this file</a><br>");

    DatanodeInfo chosenNode;
    // URL for TAIL
    LocatedBlock lastBlk = blocks.get(blocks.size() - 1);
    try {
      chosenNode = JspHelper.bestNode(lastBlk, conf);
    } catch (IOException e) {
      out.print(e.toString());
      dfs.close();
      return;
    }
    String fqdn = canonicalize(chosenNode.getIpAddr());
    String tailUrl =
        "http://"
            + fqdn
            + ":"
            + chosenNode.getInfoPort()
            + "/tail.jsp?filename="
            + URLEncoder.encode(filename, "UTF-8")
            + "&namenodeInfoPort="
            + namenodeInfoPort
            + "&chunkSizeToView="
            + chunkSizeToView
            + JspHelper.getDelegationTokenUrlParam(tokenString)
            + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr)
            + "&referrer="
            + URLEncoder.encode(req.getRequestURL() + "?" + req.getQueryString(), "UTF-8");
    out.print("<a href=\"" + tailUrl + "\">Tail this file</a><br>");

    out.print("<form action=\"/browseBlock.jsp\" method=GET>");
    out.print("<b>Chunk size to view (in bytes, up to file's DFS block size): </b>");
    out.print("<input type=\"hidden\" name=\"blockId\" value=\"" + blockId + "\">");
    out.print("<input type=\"hidden\" name=\"blockSize\" value=\"" + blockSize + "\">");
    out.print("<input type=\"hidden\" name=\"startOffset\" value=\"" + startOffset + "\">");
    out.print("<input type=\"hidden\" name=\"filename\" value=\"" + filename + "\">");
    out.print("<input type=\"hidden\" name=\"genstamp\" value=\"" + genStamp + "\">");
    out.print("<input type=\"hidden\" name=\"datanodePort\" value=\"" + datanodePort + "\">");
    out.print(
        "<input type=\"hidden\" name=\"namenodeInfoPort\" value=\"" + namenodeInfoPort + "\">");
    out.print(
        "<input type=\"hidden\" name=\""
            + JspHelper.NAMENODE_ADDRESS
            + "\" value=\""
            + nnAddr
            + "\">");
    out.print(
        "<input type=\"text\" name=\"chunkSizeToView\" value="
            + chunkSizeToView
            + " size=10 maxlength=10>");
    out.print("&nbsp;&nbsp;<input type=\"submit\" name=\"submit\" value=\"Refresh\">");
    out.print("</form>");
    out.print("<hr>");
    out.print("<a name=\"blockDetails\"></a>");
    out.print("<B>Total number of blocks: " + blocks.size() + "</B><br>");
    // generate a table and dump the info
    out.println("\n<table>");

    String nnCanonicalName = canonicalize(nnAddr);
    for (LocatedBlock cur : blocks) {
      out.print("<tr>");
      final String blockidstring = Long.toString(cur.getBlock().getBlockId());
      blockSize = cur.getBlock().getNumBytes();
      out.print("<td>" + blockidstring + ":</td>");
      DatanodeInfo[] locs = cur.getLocations();
      for (int j = 0; j < locs.length; j++) {
        String datanodeAddr = locs[j].getXferAddr();
        datanodePort = locs[j].getXferPort();
        fqdn = canonicalize(locs[j].getIpAddr());
        String blockUrl =
            "http://"
                + fqdn
                + ":"
                + locs[j].getInfoPort()
                + "/browseBlock.jsp?blockId="
                + blockidstring
                + "&blockSize="
                + blockSize
                + "&filename="
                + URLEncoder.encode(filename, "UTF-8")
                + "&datanodePort="
                + datanodePort
                + "&genstamp="
                + cur.getBlock().getGenerationStamp()
                + "&namenodeInfoPort="
                + namenodeInfoPort
                + "&chunkSizeToView="
                + chunkSizeToView
                + JspHelper.getDelegationTokenUrlParam(tokenString)
                + JspHelper.getUrlParam(JspHelper.NAMENODE_ADDRESS, nnAddr);

        String blockInfoUrl =
            "http://"
                + nnCanonicalName
                + ":"
                + namenodeInfoPort
                + "/block_info_xml.jsp?blockId="
                + blockidstring;
        out.print(
            "<td>&nbsp</td><td><a href=\""
                + blockUrl
                + "\">"
                + datanodeAddr
                + "</a></td><td>"
                + "<a href=\""
                + blockInfoUrl
                + "\">View Block Info</a></td>");
      }
      out.println("</tr>");
    }
    out.println("</table>");
    out.print("<hr>");
    out.print(
        "<br><a href=\"http://"
            + nnCanonicalName
            + ":"
            + namenodeInfoPort
            + "/dfshealth.jsp\">Go back to DFS home</a>");
    dfs.close();
  }
示例#10
0
  private void lostFoundMove(FileStatus file, LocatedBlocks blocks) throws IOException {
    final DFSClient dfs = new DFSClient(NameNode.getAddress(conf), conf);
    try {
      if (!lfInited) {
        lostFoundInit(dfs);
      }
      if (!lfInitedOk) {
        return;
      }
      String target = lostFound + file.getPath();
      String errmsg = "Failed to move " + file.getPath() + " to /lost+found";
      try {
        PermissionStatus ps =
            new PermissionStatus(file.getOwner(), file.getGroup(), file.getPermission());
        if (!nn.namesystem.dir.mkdirs(target, ps, false, FSNamesystem.now())) {
          LOG.warn(errmsg);
          return;
        }
        // create chains
        int chain = 0;
        OutputStream fos = null;
        for (LocatedBlock lBlk : blocks.getLocatedBlocks()) {
          LocatedBlock lblock = lBlk;
          DatanodeInfo[] locs = lblock.getLocations();
          if (locs == null || locs.length == 0) {
            if (fos != null) {
              fos.flush();
              fos.close();
              fos = null;
            }
            continue;
          }
          if (fos == null) {
            fos = dfs.create(target + "/" + chain, true);
            if (fos != null) chain++;
            else {
              LOG.warn(errmsg + ": could not store chain " + chain);
              // perhaps we should bail out here...
              // return;
              continue;
            }
          }

          // copy the block. It's a pity it's not abstracted from DFSInputStream ...
          try {
            copyBlock(dfs, lblock, fos);
          } catch (Exception e) {
            e.printStackTrace();
            // something went wrong copying this block...
            LOG.warn(" - could not copy block " + lblock.getBlock() + " to " + target);
            fos.flush();
            fos.close();
            fos = null;
          }
        }
        if (fos != null) fos.close();
        LOG.warn("\n - moved corrupted file " + file.getPath() + " to /lost+found");
        dfs.delete(file.getPath().toString(), true);
      } catch (Exception e) {
        e.printStackTrace();
        LOG.warn(errmsg + ": " + e.getMessage());
      }
    } finally {
      dfs.close();
    }
  }
示例#11
0
  public void generateFileDetails(JspWriter out, HttpServletRequest req, Configuration conf)
      throws IOException, InterruptedException {

    int chunkSizeToView = 0;
    long startOffset = 0;
    int datanodePort;

    String blockIdStr = null;
    long currBlockId = 0;
    blockIdStr = req.getParameter("blockId");
    if (blockIdStr == null) {
      out.print("Invalid input (blockId absent)");
      return;
    }
    currBlockId = Long.parseLong(blockIdStr);

    String datanodePortStr = req.getParameter("datanodePort");
    if (datanodePortStr == null) {
      out.print("Invalid input (datanodePort absent)");
      return;
    }
    datanodePort = Integer.parseInt(datanodePortStr);

    String namenodeInfoPortStr = req.getParameter("namenodeInfoPort");
    int namenodeInfoPort = -1;
    if (namenodeInfoPortStr != null) namenodeInfoPort = Integer.parseInt(namenodeInfoPortStr);

    String chunkSizeToViewStr = req.getParameter("chunkSizeToView");
    if (chunkSizeToViewStr != null && Integer.parseInt(chunkSizeToViewStr) > 0) {
      chunkSizeToView = Integer.parseInt(chunkSizeToViewStr);
    } else {
      chunkSizeToView = JspHelper.getDefaultChunkSize(conf);
    }

    String startOffsetStr = req.getParameter("startOffset");
    if (startOffsetStr == null || Long.parseLong(startOffsetStr) < 0) startOffset = 0;
    else startOffset = Long.parseLong(startOffsetStr);

    String filename = HtmlQuoting.unquoteHtmlChars(req.getParameter("filename"));
    if (filename == null || filename.length() == 0) {
      out.print("Invalid input");
      return;
    }

    String blockSizeStr = req.getParameter("blockSize");
    long blockSize = 0;
    if (blockSizeStr == null || blockSizeStr.length() == 0) {
      out.print("Invalid input");
      return;
    }
    blockSize = Long.parseLong(blockSizeStr);

    String tokenString = req.getParameter(JspHelper.DELEGATION_PARAMETER_NAME);
    UserGroupInformation ugi = JspHelper.getUGI(req, conf);
    DFSClient dfs = JspHelper.getDFSClient(ugi, jspHelper.nameNodeAddr, conf);
    List<LocatedBlock> blocks =
        dfs.namenode.getBlockLocations(filename, 0, Long.MAX_VALUE).getLocatedBlocks();
    // Add the various links for looking at the file contents
    // URL for downloading the full file
    String downloadUrl =
        "http://"
            + req.getServerName()
            + ":"
            + +req.getServerPort()
            + "/streamFile"
            + URLEncoder.encode(filename, "UTF-8")
            + "?"
            + JspHelper.DELEGATION_PARAMETER_NAME
            + "="
            + tokenString;
    out.print("<a name=\"viewOptions\"></a>");
    out.print("<a href=\"" + downloadUrl + "\">Download this file</a><br>");

    DatanodeInfo chosenNode;
    // URL for TAIL
    LocatedBlock lastBlk = blocks.get(blocks.size() - 1);
    long blockId = lastBlk.getBlock().getBlockId();
    try {
      chosenNode = jspHelper.bestNode(lastBlk);
    } catch (IOException e) {
      out.print(e.toString());
      dfs.close();
      return;
    }
    String fqdn = InetAddress.getByName(chosenNode.getHost()).getCanonicalHostName();
    String tailUrl =
        "http://"
            + fqdn
            + ":"
            + chosenNode.getInfoPort()
            + "/tail.jsp?filename="
            + URLEncoder.encode(filename, "UTF-8")
            + "&namenodeInfoPort="
            + namenodeInfoPort
            + "&chunkSizeToView="
            + chunkSizeToView
            + "&referrer="
            + URLEncoder.encode(req.getRequestURL() + "?" + req.getQueryString(), "UTF-8")
            + JspHelper.getDelegationTokenUrlParam(tokenString);
    out.print("<a href=\"" + tailUrl + "\">Tail this file</a><br>");

    out.print("<form action=\"/browseBlock.jsp\" method=GET>");
    out.print("<b>Chunk size to view (in bytes, up to file's DFS block size): </b>");
    out.print("<input type=\"hidden\" name=\"blockId\" value=\"" + currBlockId + "\">");
    out.print("<input type=\"hidden\" name=\"blockSize\" value=\"" + blockSize + "\">");
    out.print("<input type=\"hidden\" name=\"startOffset\" value=\"" + startOffset + "\">");
    out.print("<input type=\"hidden\" name=\"filename\" value=\"" + filename + "\">");
    out.print("<input type=\"hidden\" name=\"datanodePort\" value=\"" + datanodePort + "\">");
    out.print(
        "<input type=\"hidden\" name=\"namenodeInfoPort\" value=\"" + namenodeInfoPort + "\">");
    out.print(
        "<input type=\"text\" name=\"chunkSizeToView\" value="
            + chunkSizeToView
            + " size=10 maxlength=10>");
    out.print("&nbsp;&nbsp;<input type=\"submit\" name=\"submit\" value=\"Refresh\">");
    out.print("</form>");
    out.print("<hr>");
    out.print("<a name=\"blockDetails\"></a>");
    out.print("<B>Total number of blocks: " + blocks.size() + "</B><br>");
    // generate a table and dump the info
    out.println("\n<table>");
    for (LocatedBlock cur : blocks) {
      out.print("<tr>");
      blockId = cur.getBlock().getBlockId();
      blockSize = cur.getBlock().getNumBytes();
      String blk = "blk_" + Long.toString(blockId);
      out.print("<td>" + Long.toString(blockId) + ":</td>");
      DatanodeInfo[] locs = cur.getLocations();
      for (int j = 0; j < locs.length; j++) {
        String datanodeAddr = locs[j].getName();
        datanodePort =
            Integer.parseInt(
                datanodeAddr.substring(datanodeAddr.indexOf(':') + 1, datanodeAddr.length()));
        fqdn = InetAddress.getByName(locs[j].getHost()).getCanonicalHostName();
        String blockUrl =
            "http://"
                + fqdn
                + ":"
                + locs[j].getInfoPort()
                + "/browseBlock.jsp?blockId="
                + Long.toString(blockId)
                + "&blockSize="
                + blockSize
                + "&filename="
                + URLEncoder.encode(filename, "UTF-8")
                + "&datanodePort="
                + datanodePort
                + "&genstamp="
                + cur.getBlock().getGenerationStamp()
                + "&namenodeInfoPort="
                + namenodeInfoPort
                + "&chunkSizeToView="
                + chunkSizeToView;
        out.print(
            "<td>&nbsp</td>" + "<td><a href=\"" + blockUrl + "\">" + datanodeAddr + "</a></td>");
      }
      out.println("</tr>");
    }
    out.println("</table>");
    out.print("<hr>");
    String namenodeHost = jspHelper.nameNodeAddr.getHostName();
    out.print(
        "<br><a href=\"http://"
            + InetAddress.getByName(namenodeHost).getCanonicalHostName()
            + ":"
            + namenodeInfoPort
            + "/dfshealth.jsp\">Go back to DFS home</a>");
    dfs.close();
  }