本文整理汇总了Java中org.apache.hadoop.hdfs.server.common.JspHelper.string2ChunkSizeToView方法的典型用法代码示例。如果您正苦于以下问题：Java JspHelper.string2ChunkSizeToView方法的具体用法？Java JspHelper.string2ChunkSizeToView怎么用？Java JspHelper.string2ChunkSizeToView使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.apache.hadoop.hdfs.server.common.JspHelper的用法示例。
在下文中一共展示了JspHelper.string2ChunkSizeToView方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: generateFileChunksForTail
import org.apache.hadoop.hdfs.server.common.JspHelper; //导入方法依赖的package包/类
static void generateFileChunksForTail(JspWriter out, HttpServletRequest req,
Configuration conf
) throws IOException,
InterruptedException {
final String referrer = JspHelper.validateURL(req.getParameter("referrer"));
boolean noLink = false;
if (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");
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);
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(" <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 + "\">");
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, datanode.getNameNodeAddrForClient(), 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);
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);
} catch (IOException e) {
out.print(e.toString());
dfs.close();
return;
}
InetSocketAddress addr = NetUtils.createSocketAddr(chosenNode.getName());
// 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, blockId, accessToken, genStamp,
blockSize, startOffset, chunkSizeToView, out, conf);
out.print("</textarea>");
dfs.close();
}