/// <summary>
/// Ensure that the given NameNode marks the specified DataNode as
/// entirely dead/expired.
/// </summary>
/// <param name="nn">the NameNode to manipulate</param>
/// <param name="dnName">the name of the DataNode</param>
public static void NoticeDeadDatanode(NameNode nn, string dnName)
{
FSNamesystem namesystem = nn.GetNamesystem();
namesystem.WriteLock();
try
{
DatanodeManager dnm = namesystem.GetBlockManager().GetDatanodeManager();
HeartbeatManager hbm = dnm.GetHeartbeatManager();
DatanodeDescriptor[] dnds = hbm.GetDatanodes();
DatanodeDescriptor theDND = null;
foreach (DatanodeDescriptor dnd in dnds)
{
if (dnd.GetXferAddr().Equals(dnName))
{
theDND = dnd;
}
}
NUnit.Framework.Assert.IsNotNull("Could not find DN with name: " + dnName, theDND
);
lock (hbm)
{
DFSTestUtil.SetDatanodeDead(theDND);
hbm.HeartbeatCheck();
}
}
finally
{
namesystem.WriteUnlock();
}
}