/// <exception cref="System.IO.IOException"/>
internal virtual void AddPeer(Peer peer, Sharpen.Thread t, DataXceiver xceiver)
{
lock (this)
{
if (closed)
{
throw new IOException("Server closed.");
}
peers[peer] = t;
peersXceiver[peer] = xceiver;
}
}
public virtual void Run()
{
Peer peer = null;
while (datanode.shouldRun && !datanode.shutdownForUpgrade)
{
try
{
peer = peerServer.Accept();
// Make sure the xceiver count is not exceeded
int curXceiverCount = datanode.GetXceiverCount();
if (curXceiverCount > maxXceiverCount)
{
throw new IOException("Xceiver count " + curXceiverCount + " exceeds the limit of concurrent xcievers: "
+ maxXceiverCount);
}
new Daemon(datanode.threadGroup, DataXceiver.Create(peer, datanode, this)).Start(
);
}
catch (SocketTimeoutException)
{
}
catch (AsynchronousCloseException ace)
{
// wake up to see if should continue to run
// another thread closed our listener socket - that's expected during shutdown,
// but not in other circumstances
if (datanode.shouldRun && !datanode.shutdownForUpgrade)
{
Log.Warn(datanode.GetDisplayName() + ":DataXceiverServer: ", ace);
}
}
catch (IOException ie)
{
IOUtils.Cleanup(null, peer);
Log.Warn(datanode.GetDisplayName() + ":DataXceiverServer: ", ie);
}
catch (OutOfMemoryException ie)
{
IOUtils.Cleanup(null, peer);
// DataNode can run out of memory if there is too many transfers.
// Log the event, Sleep for 30 seconds, other transfers may complete by
// then.
Log.Error("DataNode is out of memory. Will retry in 30 seconds.", ie);
try
{
Sharpen.Thread.Sleep(30 * 1000);
}
catch (Exception)
{
}
}
catch (Exception te)
{
// ignore
Log.Error(datanode.GetDisplayName() + ":DataXceiverServer: Exiting due to: ", te);
datanode.shouldRun = false;
}
}
// Close the server to stop reception of more requests.
try
{
peerServer.Close();
closed = true;
}
catch (IOException ie)
{
Log.Warn(datanode.GetDisplayName() + " :DataXceiverServer: close exception", ie);
}
// if in restart prep stage, notify peers before closing them.
if (datanode.shutdownForUpgrade)
{
RestartNotifyPeers();
// Each thread needs some time to process it. If a thread needs
// to send an OOB message to the client, but blocked on network for
// long time, we need to force its termination.
Log.Info("Shutting down DataXceiverServer before restart");
// Allow roughly up to 2 seconds.
for (int i = 0; GetNumPeers() > 0 && i < 10; i++)
{
try
{
Sharpen.Thread.Sleep(200);
}
catch (Exception)
{
}
}
}
// ignore
// Close all peers.
CloseAllPeers();
}
