private boolean decodeMsg(Object msg) throws Throwable {
final Class<?> msgClazz = msg.getClass();
// ---- Buffer --------------------------------------------------------
if (msgClazz == NettyMessage.BufferResponse.class) {
NettyMessage.BufferResponse bufferOrEvent = (NettyMessage.BufferResponse) msg;
RemoteInputChannel inputChannel = inputChannels.get(bufferOrEvent.receiverId);
if (inputChannel == null) {
bufferOrEvent.releaseBuffer();
cancelRequestFor(bufferOrEvent.receiverId);
return true;
}
return decodeBufferOrEvent(inputChannel, bufferOrEvent);
}
// ---- Error ---------------------------------------------------------
else if (msgClazz == NettyMessage.ErrorResponse.class) {
NettyMessage.ErrorResponse error = (NettyMessage.ErrorResponse) msg;
SocketAddress remoteAddr = ctx.channel().remoteAddress();
if (error.isFatalError()) {
notifyAllChannelsOfErrorAndClose(
new RemoteTransportException(
"Fatal error at remote task manager '" + remoteAddr + "'.",
remoteAddr,
error.cause));
} else {
RemoteInputChannel inputChannel = inputChannels.get(error.receiverId);
if (inputChannel != null) {
if (error.cause.getClass() == PartitionNotFoundException.class) {
inputChannel.onFailedPartitionRequest();
} else {
inputChannel.onError(
new RemoteTransportException(
"Error at remote task manager '" + remoteAddr + "'.", remoteAddr, error.cause));
}
}
}
} else {
throw new IllegalStateException("Received unknown message from producer: " + msg.getClass());
}
return true;
}
private void notifyAllChannelsOfErrorAndClose(Throwable cause) {
if (channelError.compareAndSet(false, true)) {
try {
for (RemoteInputChannel inputChannel : inputChannels.values()) {
inputChannel.onError(cause);
}
} catch (Throwable t) {
// We can only swallow the Exception at this point. :(
LOG.warn(
"An Exception was thrown during error notification of a " + "remote input channel.", t);
} finally {
inputChannels.clear();
if (ctx != null) {
ctx.close();
}
}
}
}
