/* check if there are at least two nodes are on the same rack */
/// <exception cref="System.IO.IOException"/>
private void CheckFile(FileSystem fileSys, Path name, int repl)
{
Configuration conf = fileSys.GetConf();
ClientProtocol namenode = NameNodeProxies.CreateProxy <ClientProtocol>(conf, fileSys
.GetUri()).GetProxy();
WaitForBlockReplication(name.ToString(), namenode, Math.Min(numDatanodes, repl),
-1);
LocatedBlocks locations = namenode.GetBlockLocations(name.ToString(), 0, long.MaxValue
);
FileStatus stat = fileSys.GetFileStatus(name);
BlockLocation[] blockLocations = fileSys.GetFileBlockLocations(stat, 0L, long.MaxValue
);
// verify that rack locations match
NUnit.Framework.Assert.IsTrue(blockLocations.Length == locations.LocatedBlockCount
());
for (int i = 0; i < blockLocations.Length; i++)
{
LocatedBlock blk = locations.Get(i);
DatanodeInfo[] datanodes = blk.GetLocations();
string[] topologyPaths = blockLocations[i].GetTopologyPaths();
NUnit.Framework.Assert.IsTrue(topologyPaths.Length == datanodes.Length);
for (int j = 0; j < topologyPaths.Length; j++)
{
bool found = false;
for (int k = 0; k < racks.Length; k++)
{
if (topologyPaths[j].StartsWith(racks[k]))
{
found = true;
break;
}
}
NUnit.Framework.Assert.IsTrue(found);
}
}
bool isOnSameRack = true;
bool isNotOnSameRack = true;
foreach (LocatedBlock blk_1 in locations.GetLocatedBlocks())
{
DatanodeInfo[] datanodes = blk_1.GetLocations();
if (datanodes.Length <= 1)
{
break;
}
if (datanodes.Length == 2)
{
isNotOnSameRack = !(datanodes[0].GetNetworkLocation().Equals(datanodes[1].GetNetworkLocation
()));
break;
}
isOnSameRack = false;
isNotOnSameRack = false;
for (int i_1 = 0; i_1 < datanodes.Length - 1; i_1++)
{
Log.Info("datanode " + i_1 + ": " + datanodes[i_1]);
bool onRack = false;
for (int j = i_1 + 1; j < datanodes.Length; j++)
{
if (datanodes[i_1].GetNetworkLocation().Equals(datanodes[j].GetNetworkLocation()))
{
onRack = true;
}
}
if (onRack)
{
isOnSameRack = true;
}
if (!onRack)
{
isNotOnSameRack = true;
}
if (isOnSameRack && isNotOnSameRack)
{
break;
}
}
if (!isOnSameRack || !isNotOnSameRack)
{
break;
}
}
NUnit.Framework.Assert.IsTrue(isOnSameRack);
NUnit.Framework.Assert.IsTrue(isNotOnSameRack);
}
public virtual void TestGetBlocks()
{
Configuration Conf = new HdfsConfiguration();
short ReplicationFactor = (short)2;
int DefaultBlockSize = 1024;
Random r = new Random();
Conf.SetLong(DFSConfigKeys.DfsBlockSizeKey, DefaultBlockSize);
MiniDFSCluster cluster = new MiniDFSCluster.Builder(Conf).NumDataNodes(ReplicationFactor
).Build();
try
{
cluster.WaitActive();
// create a file with two blocks
FileSystem fs = cluster.GetFileSystem();
FSDataOutputStream @out = fs.Create(new Path("/tmp.txt"), ReplicationFactor);
byte[] data = new byte[1024];
long fileLen = 2 * DefaultBlockSize;
long bytesToWrite = fileLen;
while (bytesToWrite > 0)
{
r.NextBytes(data);
int bytesToWriteNext = (1024 < bytesToWrite) ? 1024 : (int)bytesToWrite;
@out.Write(data, 0, bytesToWriteNext);
bytesToWrite -= bytesToWriteNext;
}
@out.Close();
// get blocks & data nodes
IList <LocatedBlock> locatedBlocks;
DatanodeInfo[] dataNodes = null;
bool notWritten;
do
{
DFSClient dfsclient = new DFSClient(NameNode.GetAddress(Conf), Conf);
locatedBlocks = dfsclient.GetNamenode().GetBlockLocations("/tmp.txt", 0, fileLen)
.GetLocatedBlocks();
NUnit.Framework.Assert.AreEqual(2, locatedBlocks.Count);
notWritten = false;
for (int i = 0; i < 2; i++)
{
dataNodes = locatedBlocks[i].GetLocations();
if (dataNodes.Length != ReplicationFactor)
{
notWritten = true;
try
{
Sharpen.Thread.Sleep(10);
}
catch (Exception)
{
}
break;
}
}
}while (notWritten);
// get RPC client to namenode
IPEndPoint addr = new IPEndPoint("localhost", cluster.GetNameNodePort());
NamenodeProtocol namenode = NameNodeProxies.CreateProxy <NamenodeProtocol>(Conf, NameNode
.GetUri(addr)).GetProxy();
// get blocks of size fileLen from dataNodes[0]
BlocksWithLocations.BlockWithLocations[] locs;
locs = namenode.GetBlocks(dataNodes[0], fileLen).GetBlocks();
NUnit.Framework.Assert.AreEqual(locs.Length, 2);
NUnit.Framework.Assert.AreEqual(locs[0].GetStorageIDs().Length, 2);
NUnit.Framework.Assert.AreEqual(locs[1].GetStorageIDs().Length, 2);
// get blocks of size BlockSize from dataNodes[0]
locs = namenode.GetBlocks(dataNodes[0], DefaultBlockSize).GetBlocks();
NUnit.Framework.Assert.AreEqual(locs.Length, 1);
NUnit.Framework.Assert.AreEqual(locs[0].GetStorageIDs().Length, 2);
// get blocks of size 1 from dataNodes[0]
locs = namenode.GetBlocks(dataNodes[0], 1).GetBlocks();
NUnit.Framework.Assert.AreEqual(locs.Length, 1);
NUnit.Framework.Assert.AreEqual(locs[0].GetStorageIDs().Length, 2);
// get blocks of size 0 from dataNodes[0]
GetBlocksWithException(namenode, dataNodes[0], 0);
// get blocks of size -1 from dataNodes[0]
GetBlocksWithException(namenode, dataNodes[0], -1);
// get blocks of size BlockSize from a non-existent datanode
DatanodeInfo info = DFSTestUtil.GetDatanodeInfo("1.2.3.4");
GetBlocksWithException(namenode, info, 2);
}
finally
{
cluster.Shutdown();
}
}