/// <summary>The following test first creates a file.</summary>
/// <remarks>
/// The following test first creates a file.
/// It verifies the block information from a datanode.
/// Then, it updates the block with new information and verifies again.
/// </remarks>
/// <param name="useDnHostname">whether DNs should connect to other DNs by hostname</param>
/// <exception cref="System.Exception"/>
private void CheckBlockMetaDataInfo(bool useDnHostname)
{
MiniDFSCluster cluster = null;
conf.SetBoolean(DFSConfigKeys.DfsDatanodeUseDnHostname, useDnHostname);
if (useDnHostname)
{
// Since the mini cluster only listens on the loopback we have to
// ensure the hostname used to access DNs maps to the loopback. We
// do this by telling the DN to advertise localhost as its hostname
// instead of the default hostname.
conf.Set(DFSConfigKeys.DfsDatanodeHostNameKey, "localhost");
}
try
{
cluster = new MiniDFSCluster.Builder(conf).NumDataNodes(3).CheckDataNodeHostConfig
(true).Build();
cluster.WaitActive();
//create a file
DistributedFileSystem dfs = cluster.GetFileSystem();
string filestr = "/foo";
Path filepath = new Path(filestr);
DFSTestUtil.CreateFile(dfs, filepath, 1024L, (short)3, 0L);
NUnit.Framework.Assert.IsTrue(dfs.Exists(filepath));
//get block info
LocatedBlock locatedblock = GetLastLocatedBlock(DFSClientAdapter.GetDFSClient(dfs
).GetNamenode(), filestr);
DatanodeInfo[] datanodeinfo = locatedblock.GetLocations();
NUnit.Framework.Assert.IsTrue(datanodeinfo.Length > 0);
//connect to a data node
DataNode datanode = cluster.GetDataNode(datanodeinfo[0].GetIpcPort());
InterDatanodeProtocol idp = DataNodeTestUtils.CreateInterDatanodeProtocolProxy(datanode
, datanodeinfo[0], conf, useDnHostname);
// Stop the block scanners.
datanode.GetBlockScanner().RemoveAllVolumeScanners();
//verify BlockMetaDataInfo
ExtendedBlock b = locatedblock.GetBlock();
InterDatanodeProtocol.Log.Info("b=" + b + ", " + b.GetType());
CheckMetaInfo(b, datanode);
long recoveryId = b.GetGenerationStamp() + 1;
idp.InitReplicaRecovery(new BlockRecoveryCommand.RecoveringBlock(b, locatedblock.
GetLocations(), recoveryId));
//verify updateBlock
ExtendedBlock newblock = new ExtendedBlock(b.GetBlockPoolId(), b.GetBlockId(), b.
GetNumBytes() / 2, b.GetGenerationStamp() + 1);
idp.UpdateReplicaUnderRecovery(b, recoveryId, b.GetBlockId(), newblock.GetNumBytes
());
CheckMetaInfo(newblock, datanode);
// Verify correct null response trying to init recovery for a missing block
ExtendedBlock badBlock = new ExtendedBlock("fake-pool", b.GetBlockId(), 0, 0);
NUnit.Framework.Assert.IsNull(idp.InitReplicaRecovery(new BlockRecoveryCommand.RecoveringBlock
(badBlock, locatedblock.GetLocations(), recoveryId)));
}
finally
{
if (cluster != null)
{
cluster.Shutdown();
}
}
}
