/// <exception cref="System.IO.IOException"/>
private void TestPersistHelper(Configuration conf)
{
MiniDFSCluster cluster = null;
try
{
cluster = new MiniDFSCluster.Builder(conf).Build();
cluster.WaitActive();
FSNamesystem fsn = cluster.GetNamesystem();
DistributedFileSystem fs = cluster.GetFileSystem();
Path dir = new Path("/abc/def");
Path file1 = new Path(dir, "f1");
Path file2 = new Path(dir, "f2");
// create an empty file f1
fs.Create(file1).Close();
// create an under-construction file f2
FSDataOutputStream @out = fs.Create(file2);
@out.WriteBytes("hello");
((DFSOutputStream)@out.GetWrappedStream()).Hsync(EnumSet.Of(HdfsDataOutputStream.SyncFlag
.UpdateLength));
// checkpoint
fs.SetSafeMode(HdfsConstants.SafeModeAction.SafemodeEnter);
fs.SaveNamespace();
fs.SetSafeMode(HdfsConstants.SafeModeAction.SafemodeLeave);
cluster.RestartNameNode();
cluster.WaitActive();
fs = cluster.GetFileSystem();
NUnit.Framework.Assert.IsTrue(fs.IsDirectory(dir));
NUnit.Framework.Assert.IsTrue(fs.Exists(file1));
NUnit.Framework.Assert.IsTrue(fs.Exists(file2));
// check internals of file2
INodeFile file2Node = fsn.dir.GetINode4Write(file2.ToString()).AsFile();
NUnit.Framework.Assert.AreEqual("hello".Length, file2Node.ComputeFileSize());
NUnit.Framework.Assert.IsTrue(file2Node.IsUnderConstruction());
BlockInfoContiguous[] blks = file2Node.GetBlocks();
NUnit.Framework.Assert.AreEqual(1, blks.Length);
NUnit.Framework.Assert.AreEqual(HdfsServerConstants.BlockUCState.UnderConstruction
, blks[0].GetBlockUCState());
// check lease manager
LeaseManager.Lease lease = fsn.leaseManager.GetLeaseByPath(file2.ToString());
NUnit.Framework.Assert.IsNotNull(lease);
}
finally
{
if (cluster != null)
{
cluster.Shutdown();
}
}
}
