How to use

touch

method

in

alluxio.util.UnderFileSystemUtils

UnderFileSystemUtils.touch(ufs, URIUtils.appendPath(mLocation,
  ServerConfiguration.get(PropertyKey.MASTER_FORMAT_FILE_PREFIX)
    + System.currentTimeMillis())

/**
 * Formats the journal.
 */
public void format() throws IOException {
 URI location = getLocation();
 LOG.info("Formatting {}", location);
 if (mUfs.isDirectory(location.toString())) {
  for (UfsStatus status : mUfs.listStatus(location.toString())) {
   String childPath = URIUtils.appendPathOrDie(location, status.getName()).toString();
   if (status.isDirectory()
     && !mUfs.deleteDirectory(childPath, DeleteOptions.defaults().setRecursive(true))
     || status.isFile() && !mUfs.deleteFile(childPath)) {
    throw new IOException(String.format("Failed to delete %s", childPath));
   }
  }
 } else if (!mUfs.mkdirs(location.toString())) {
  throw new IOException(String.format("Failed to create %s", location));
 }
 // Create a breadcrumb that indicates that the journal folder has been formatted.
 UnderFileSystemUtils.touch(mUfs, URIUtils.appendPathOrDie(location,
   ServerConfiguration.get(PropertyKey.MASTER_FORMAT_FILE_PREFIX) + System.currentTimeMillis())
   .toString());
}

UnderFileSystem ufs = UnderFileSystem.Factory.create(job.getTempUfsPath(),
  ServerConfiguration.global());
UnderFileSystemUtils.touch(ufs, job.getTempUfsPath());

UnderFileSystem ufs = UnderFileSystem.Factory.create(job.getTempUfsPath(),
  ServerConfiguration.global());
UnderFileSystemUtils.touch(ufs, job.getTempUfsPath());

UnderFileSystemUtils.touch(ufs, URIUtils.appendPath(mLocation,
  Configuration.get(PropertyKey.MASTER_FORMAT_FILE_PREFIX) + System.currentTimeMillis())
  .toString());

/**
 * Formats the journal.
 */
public void format() throws IOException {
 URI location = getLocation();
 LOG.info("Formatting {}", location);
 if (mUfs.isDirectory(location.toString())) {
  for (UfsStatus status : mUfs.listStatus(location.toString())) {
   String childPath = URIUtils.appendPathOrDie(location, status.getName()).toString();
   if (status.isDirectory()
     && !mUfs.deleteDirectory(childPath, DeleteOptions.defaults().setRecursive(true))
     || status.isFile() && !mUfs.deleteFile(childPath)) {
    throw new IOException(String.format("Failed to delete %s", childPath));
   }
  }
 } else if (!mUfs.mkdirs(location.toString())) {
  throw new IOException(String.format("Failed to create %s", location));
 }
 // Create a breadcrumb that indicates that the journal folder has been formatted.
 UnderFileSystemUtils.touch(mUfs, URIUtils.appendPathOrDie(location,
   Configuration.get(PropertyKey.MASTER_FORMAT_FILE_PREFIX) + System.currentTimeMillis())
   .toString());
}