/// <exception cref="System.IO.IOException"/>
private static JobSplit.SplitMetaInfo[] WriteOldSplits(InputSplit[] splits, FSDataOutputStream
@out, Configuration conf)
{
JobSplit.SplitMetaInfo[] info = new JobSplit.SplitMetaInfo[splits.Length];
if (splits.Length != 0)
{
int i = 0;
long offset = @out.GetPos();
int maxBlockLocations = conf.GetInt(MRConfig.MaxBlockLocationsKey, MRConfig.MaxBlockLocationsDefault
);
foreach (InputSplit split in splits)
{
long prevLen = @out.GetPos();
Text.WriteString(@out, split.GetType().FullName);
split.Write(@out);
long currLen = @out.GetPos();
string[] locations = split.GetLocations();
if (locations.Length > maxBlockLocations)
{
Log.Warn("Max block location exceeded for split: " + split + " splitsize: " + locations
.Length + " maxsize: " + maxBlockLocations);
locations = Arrays.CopyOf(locations, maxBlockLocations);
}
info[i++] = new JobSplit.SplitMetaInfo(locations, offset, split.GetLength());
offset += currLen - prevLen;
}
}
return(info);
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
private static JobSplit.SplitMetaInfo[] WriteNewSplits <T>(Configuration conf, T[]
array, FSDataOutputStream @out)
where T : InputSplit
{
JobSplit.SplitMetaInfo[] info = new JobSplit.SplitMetaInfo[array.Length];
if (array.Length != 0)
{
SerializationFactory factory = new SerializationFactory(conf);
int i = 0;
int maxBlockLocations = conf.GetInt(MRConfig.MaxBlockLocationsKey, MRConfig.MaxBlockLocationsDefault
);
long offset = @out.GetPos();
foreach (T split in array)
{
long prevCount = @out.GetPos();
Text.WriteString(@out, split.GetType().FullName);
Org.Apache.Hadoop.IO.Serializer.Serializer <T> serializer = factory.GetSerializer(
(Type)split.GetType());
serializer.Open(@out);
serializer.Serialize(split);
long currCount = @out.GetPos();
string[] locations = split.GetLocations();
if (locations.Length > maxBlockLocations)
{
Log.Warn("Max block location exceeded for split: " + split + " splitsize: " + locations
.Length + " maxsize: " + maxBlockLocations);
locations = Arrays.CopyOf(locations, maxBlockLocations);
}
info[i++] = new JobSplit.SplitMetaInfo(locations, offset, split.GetLength());
offset += currCount - prevCount;
}
}
return(info);
}
/// <exception cref="System.IO.IOException"/>
public static JobSplit.TaskSplitMetaInfo[] ReadSplitMetaInfo(JobID jobId, FileSystem
fs, Configuration conf, Path jobSubmitDir)
{
long maxMetaInfoSize = conf.GetLong(MRJobConfig.SplitMetainfoMaxsize, MRJobConfig
.DefaultSplitMetainfoMaxsize);
Path metaSplitFile = JobSubmissionFiles.GetJobSplitMetaFile(jobSubmitDir);
string jobSplitFile = JobSubmissionFiles.GetJobSplitFile(jobSubmitDir).ToString();
FileStatus fStatus = fs.GetFileStatus(metaSplitFile);
if (maxMetaInfoSize > 0 && fStatus.GetLen() > maxMetaInfoSize)
{
throw new IOException("Split metadata size exceeded " + maxMetaInfoSize + ". Aborting job "
+ jobId);
}
FSDataInputStream @in = fs.Open(metaSplitFile);
byte[] header = new byte[JobSplit.MetaSplitFileHeader.Length];
@in.ReadFully(header);
if (!Arrays.Equals(JobSplit.MetaSplitFileHeader, header))
{
throw new IOException("Invalid header on split file");
}
int vers = WritableUtils.ReadVInt(@in);
if (vers != JobSplit.MetaSplitVersion)
{
@in.Close();
throw new IOException("Unsupported split version " + vers);
}
int numSplits = WritableUtils.ReadVInt(@in);
//TODO: check for insane values
JobSplit.TaskSplitMetaInfo[] allSplitMetaInfo = new JobSplit.TaskSplitMetaInfo[numSplits
];
for (int i = 0; i < numSplits; i++)
{
JobSplit.SplitMetaInfo splitMetaInfo = new JobSplit.SplitMetaInfo();
splitMetaInfo.ReadFields(@in);
JobSplit.TaskSplitIndex splitIndex = new JobSplit.TaskSplitIndex(jobSplitFile, splitMetaInfo
.GetStartOffset());
allSplitMetaInfo[i] = new JobSplit.TaskSplitMetaInfo(splitIndex, splitMetaInfo.GetLocations
(), splitMetaInfo.GetInputDataLength());
}
@in.Close();
return(allSplitMetaInfo);
}