/// <summary>List input directories.</summary>
/// <remarks>
/// List input directories.
/// Subclasses may override to, e.g., select only files matching a regular
/// expression.
/// </remarks>
/// <param name="job">the job to list input paths for</param>
/// <returns>array of FileStatus objects</returns>
/// <exception cref="System.IO.IOException">if zero items.</exception>
protected internal virtual FileStatus[] ListStatus(JobConf job)
{
Path[] dirs = GetInputPaths(job);
if (dirs.Length == 0)
{
throw new IOException("No input paths specified in job");
}
// get tokens for all the required FileSystems..
TokenCache.ObtainTokensForNamenodes(job.GetCredentials(), dirs, job);
// Whether we need to recursive look into the directory structure
bool recursive = job.GetBoolean(InputDirRecursive, false);
// creates a MultiPathFilter with the hiddenFileFilter and the
// user provided one (if any).
IList <PathFilter> filters = new AList <PathFilter>();
filters.AddItem(hiddenFileFilter);
PathFilter jobFilter = GetInputPathFilter(job);
if (jobFilter != null)
{
filters.AddItem(jobFilter);
}
PathFilter inputFilter = new FileInputFormat.MultiPathFilter(filters);
FileStatus[] result;
int numThreads = job.GetInt(FileInputFormat.ListStatusNumThreads, FileInputFormat
.DefaultListStatusNumThreads);
StopWatch sw = new StopWatch().Start();
if (numThreads == 1)
{
IList <FileStatus> locatedFiles = SingleThreadedListStatus(job, dirs, inputFilter,
recursive);
result = Sharpen.Collections.ToArray(locatedFiles, new FileStatus[locatedFiles.Count
]);
}
else
{
IEnumerable <FileStatus> locatedFiles = null;
try
{
LocatedFileStatusFetcher locatedFileStatusFetcher = new LocatedFileStatusFetcher(
job, dirs, recursive, inputFilter, false);
locatedFiles = locatedFileStatusFetcher.GetFileStatuses();
}
catch (Exception)
{
throw new IOException("Interrupted while getting file statuses");
}
result = Iterables.ToArray <FileStatus>(locatedFiles);
}
sw.Stop();
if (Log.IsDebugEnabled())
{
Log.Debug("Time taken to get FileStatuses: " + sw.Now(TimeUnit.Milliseconds));
}
Log.Info("Total input paths to process : " + result.Length);
return(result);
}
internal ProcessInitialInputPathCallback(LocatedFileStatusFetcher _enclosing)
{
this._enclosing = _enclosing;
}
