/**
  * Get all of the paths that currently exist in the working directories.
  *
  * @param pathStr the path underneath the roots
  * @param conf the configuration to look up the roots in
  * @return all of the paths that exist under any of the roots
  * @throws IOException
  */
 public Iterable<Path> getAllLocalPathsToRead(String pathStr, Configuration conf)
     throws IOException {
   AllocatorPerContext context;
   synchronized (this) {
     context = obtainContext(contextCfgItemName);
   }
   return context.getAllLocalPathsToRead(pathStr, conf);
 }