/// <exception cref="Org.Apache.Hadoop.Ipc.RpcServerException"/>
private static RPC.Server.ProtoClassProtoImpl GetProtocolImpl(RPC.Server server,
string protoName, long clientVersion)
{
RPC.Server.ProtoNameVer pv = new RPC.Server.ProtoNameVer(protoName, clientVersion
);
RPC.Server.ProtoClassProtoImpl impl = server.GetProtocolImplMap(RPC.RpcKind.RpcProtocolBuffer
)[pv];
if (impl == null)
{
// no match for Protocol AND Version
RPC.Server.VerProtocolImpl highest = server.GetHighestSupportedProtocol(RPC.RpcKind
.RpcProtocolBuffer, protoName);
if (highest == null)
{
throw new RpcNoSuchProtocolException("Unknown protocol: " + protoName);
}
// protocol supported but not the version that client wants
throw new RPC.VersionMismatch(protoName, clientVersion, highest.version);
}
return(impl);
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="Org.Apache.Hadoop.Ipc.RPC.VersionMismatch"/>
public virtual IWritable Call(RPC.Server server, string protocolName, IWritable rpcRequest
, long receivedTime)
{
WritableRpcEngine.Invocation call = (WritableRpcEngine.Invocation)rpcRequest;
if (server.verbose)
{
Log("Call: " + call);
}
// Verify writable rpc version
if (call.GetRpcVersion() != writableRpcVersion)
{
// Client is using a different version of WritableRpc
throw new RpcServerException("WritableRpc version mismatch, client side version="
+ call.GetRpcVersion() + ", server side version=" + writableRpcVersion);
}
long clientVersion = call.GetProtocolVersion();
string protoName;
RPC.Server.ProtoClassProtoImpl protocolImpl;
if (call.declaringClassProtocolName.Equals(typeof(VersionedProtocol).FullName))
{
// VersionProtocol methods are often used by client to figure out
// which version of protocol to use.
//
// Versioned protocol methods should go the protocolName protocol
// rather than the declaring class of the method since the
// the declaring class is VersionedProtocol which is not
// registered directly.
// Send the call to the highest protocol version
RPC.Server.VerProtocolImpl highest = server.GetHighestSupportedProtocol(RPC.RpcKind
.RpcWritable, protocolName);
if (highest == null)
{
throw new RpcServerException("Unknown protocol: " + protocolName);
}
protocolImpl = highest.protocolTarget;
}
else
{
protoName = call.declaringClassProtocolName;
// Find the right impl for the protocol based on client version.
RPC.Server.ProtoNameVer pv = new RPC.Server.ProtoNameVer(call.declaringClassProtocolName
, clientVersion);
protocolImpl = server.GetProtocolImplMap(RPC.RpcKind.RpcWritable)[pv];
if (protocolImpl == null)
{
// no match for Protocol AND Version
RPC.Server.VerProtocolImpl highest = server.GetHighestSupportedProtocol(RPC.RpcKind
.RpcWritable, protoName);
if (highest == null)
{
throw new RpcServerException("Unknown protocol: " + protoName);
}
else
{
// protocol supported but not the version that client wants
throw new RPC.VersionMismatch(protoName, clientVersion, highest.version);
}
}
}
// Invoke the protocol method
long startTime = Time.Now();
int qTime = (int)(startTime - receivedTime);
Exception exception = null;
try
{
MethodInfo method = protocolImpl.protocolClass.GetMethod(call.GetMethodName(), call
.GetParameterClasses());
server.rpcDetailedMetrics.Init(protocolImpl.protocolClass);
object value = method.Invoke(protocolImpl.protocolImpl, call.GetParameters());
if (server.verbose)
{
Log("Return: " + value);
}
return(new ObjectWritable(method.ReturnType, value));
}
catch (TargetInvocationException e)
{
Exception target = e.InnerException;
if (target is IOException)
{
exception = (IOException)target;
throw (IOException)target;
}
else
{
IOException ioe = new IOException(target.ToString());
ioe.SetStackTrace(target.GetStackTrace());
exception = ioe;
throw ioe;
}
}
catch (Exception e)
{
if (!(e is IOException))
{
Log.Error("Unexpected throwable object ", e);
}
IOException ioe = new IOException(e.ToString());
ioe.SetStackTrace(e.GetStackTrace());
exception = ioe;
throw ioe;
}
finally
{
int processingTime = (int)(Time.Now() - startTime);
if (Log.IsDebugEnabled())
{
string msg = "Served: " + call.GetMethodName() + " queueTime= " + qTime + " procesingTime= "
+ processingTime;
if (exception != null)
{
msg += " exception= " + exception.GetType().Name;
}
Log.Debug(msg);
}
string detailedMetricsName = (exception == null) ? call.GetMethodName() : exception
.GetType().Name;
server.rpcMetrics.AddRpcQueueTime(qTime);
server.rpcMetrics.AddRpcProcessingTime(processingTime);
server.rpcDetailedMetrics.AddProcessingTime(detailedMetricsName, processingTime);
}
}