/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.Apache.Hadoop.FS.UnresolvedLinkException"/>
public ChecksumFSInputChecker(ChecksumFs fs, Path file, int bufferSize)
: base(file, fs.GetFileStatus(file).GetReplication())
{
this.datas = fs.GetRawFs().Open(file, bufferSize);
this.fs = fs;
Path sumFile = fs.GetChecksumFile(file);
try
{
int sumBufferSize = fs.GetSumBufferSize(fs.GetBytesPerSum(), bufferSize);
sums = fs.GetRawFs().Open(sumFile, sumBufferSize);
byte[] version = new byte[ChecksumVersion.Length];
sums.ReadFully(version);
if (!Arrays.Equals(version, ChecksumVersion))
{
throw new IOException("Not a checksum file: " + sumFile);
}
this.bytesPerSum = sums.ReadInt();
Set(fs.verifyChecksum, DataChecksum.NewCrc32(), bytesPerSum, 4);
}
catch (FileNotFoundException)
{
// quietly ignore
Set(fs.verifyChecksum, null, 1, 0);
}
catch (IOException e)
{
// loudly ignore
Log.Warn("Problem opening checksum file: " + file + ". Ignoring exception: ", e);
Set(fs.verifyChecksum, null, 1, 0);
}
}
/// <exception cref="System.IO.IOException"/>
public ChecksumFSOutputSummer(ChecksumFs fs, Path file, EnumSet <CreateFlag> createFlag
, FsPermission absolutePermission, int bufferSize, short replication, long blockSize
, Progressable progress, Options.ChecksumOpt checksumOpt, bool createParent)
: base(DataChecksum.NewDataChecksum(DataChecksum.Type.Crc32, fs.GetBytesPerSum())
)
{
// checksumOpt is passed down to the raw fs. Unless it implements
// checksum impelemts internally, checksumOpt will be ignored.
// If the raw fs does checksum internally, we will end up with
// two layers of checksumming. i.e. checksumming checksum file.
this.datas = fs.GetRawFs().CreateInternal(file, createFlag, absolutePermission, bufferSize
, replication, blockSize, progress, checksumOpt, createParent);
// Now create the chekcsumfile; adjust the buffsize
int bytesPerSum = fs.GetBytesPerSum();
int sumBufferSize = fs.GetSumBufferSize(bytesPerSum, bufferSize);
this.sums = fs.GetRawFs().CreateInternal(fs.GetChecksumFile(file), EnumSet.Of(CreateFlag
.Create, CreateFlag.Overwrite), absolutePermission, sumBufferSize, replication,
blockSize, progress, checksumOpt, createParent);
sums.Write(ChecksumVersion, 0, ChecksumVersion.Length);
sums.WriteInt(bytesPerSum);
}