Java Code Examples for org.apache.hadoop.hdfs.client.HdfsDataInputStream#getVisibleLength()

The following examples show how to use org.apache.hadoop.hdfs.client.HdfsDataInputStream#getVisibleLength() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: WebHdfsHandler.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
private void onOpen(ChannelHandlerContext ctx) throws IOException {
  final String nnId = params.namenodeId();
  final int bufferSize = params.bufferSize();
  final long offset = params.offset();
  final long length = params.length();

  DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
  HttpHeaders headers = response.headers();
  // Allow the UI to access the file
  headers.set(ACCESS_CONTROL_ALLOW_METHODS, GET);
  headers.set(ACCESS_CONTROL_ALLOW_ORIGIN, "*");
  headers.set(CONTENT_TYPE, APPLICATION_OCTET_STREAM);
  headers.set(CONNECTION, CLOSE);

  final DFSClient dfsclient = newDfsClient(nnId, conf);
  HdfsDataInputStream in = dfsclient.createWrappedInputStream(
    dfsclient.open(path, bufferSize, true));
  in.seek(offset);

  long contentLength = in.getVisibleLength() - offset;
  if (length >= 0) {
    contentLength = Math.min(contentLength, length);
  }
  final InputStream data;
  if (contentLength >= 0) {
    headers.set(CONTENT_LENGTH, contentLength);
    data = new LimitInputStream(in, contentLength);
  } else {
    data = in;
  }

  ctx.write(response);
  ctx.writeAndFlush(new ChunkedStream(data) {
    @Override
    public void close() throws Exception {
      super.close();
      dfsclient.close();
    }
  }).addListener(ChannelFutureListener.CLOSE);
}
Example 2
Source File: WebHdfsHandler.java    From big-c with Apache License 2.0 5 votes vote down vote up 
private void onOpen(ChannelHandlerContext ctx) throws IOException {
  final String nnId = params.namenodeId();
  final int bufferSize = params.bufferSize();
  final long offset = params.offset();
  final long length = params.length();

  DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
  HttpHeaders headers = response.headers();
  // Allow the UI to access the file
  headers.set(ACCESS_CONTROL_ALLOW_METHODS, GET);
  headers.set(ACCESS_CONTROL_ALLOW_ORIGIN, "*");
  headers.set(CONTENT_TYPE, APPLICATION_OCTET_STREAM);
  headers.set(CONNECTION, CLOSE);

  final DFSClient dfsclient = newDfsClient(nnId, conf);
  HdfsDataInputStream in = dfsclient.createWrappedInputStream(
    dfsclient.open(path, bufferSize, true));
  in.seek(offset);

  long contentLength = in.getVisibleLength() - offset;
  if (length >= 0) {
    contentLength = Math.min(contentLength, length);
  }
  final InputStream data;
  if (contentLength >= 0) {
    headers.set(CONTENT_LENGTH, contentLength);
    data = new LimitInputStream(in, contentLength);
  } else {
    data = in;
  }

  ctx.write(response);
  ctx.writeAndFlush(new ChunkedStream(data) {
    @Override
    public void close() throws Exception {
      super.close();
      dfsclient.close();
    }
  }).addListener(ChannelFutureListener.CLOSE);
}