public virtual void TestSequenceFileSync()
{
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).Build();
FileSystem fs = cluster.GetFileSystem();
Path p = new Path("/testSequenceFileSync/foo");
int len = 1 << 16;
FSDataOutputStream @out = fs.Create(p, FsPermission.GetDefault(), EnumSet.Of(CreateFlag
.Create, CreateFlag.Overwrite, CreateFlag.SyncBlock), 4096, (short)1, len, null);
SequenceFile.Writer w = SequenceFile.CreateWriter(new Configuration(), SequenceFile.Writer
.Stream(@out), SequenceFile.Writer.KeyClass(typeof(RandomDatum)), SequenceFile.Writer
.ValueClass(typeof(RandomDatum)), SequenceFile.Writer.Compression(SequenceFile.CompressionType
.None, new DefaultCodec()));
w.Hflush();
CheckSyncMetric(cluster, 0);
w.Hsync();
CheckSyncMetric(cluster, 1);
int seed = new Random().Next();
RandomDatum.Generator generator = new RandomDatum.Generator(seed);
generator.Next();
w.Append(generator.GetKey(), generator.GetValue());
w.Hsync();
CheckSyncMetric(cluster, 2);
w.Close();
CheckSyncMetric(cluster, 2);
@out.Close();
CheckSyncMetric(cluster, 3);
cluster.Shutdown();
}