@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
Channel ch = e.getChannel();
Throwable cause = e.getCause();
if (cause instanceof TooLongFrameException) {
sendError(ctx, BAD_REQUEST);
return;
}
LOG.error("Shuffle error: ", cause);
shuffleMetrics.failedOutput();
if (ch.isConnected()) {
LOG.error("Shuffle error " + e);
sendError(ctx, INTERNAL_SERVER_ERROR);
}
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent evt) throws Exception {
HttpRequest request = (HttpRequest) evt.getMessage();
if (request.getMethod() != GET) {
sendError(ctx, METHOD_NOT_ALLOWED);
return;
}
final Map<String, List<String>> q = new QueryStringDecoder(request.getUri()).getParameters();
final List<String> mapIds = splitMaps(q.get("map"));
final List<String> reduceQ = q.get("reduce");
final List<String> jobQ = q.get("job");
if (LOG.isInfoEnabled()) {
LOG.info(
"RECV: "
+ request.getUri()
+ "\n mapIds: "
+ mapIds
+ "\n reduceId: "
+ reduceQ
+ "\n jobId: "
+ jobQ);
}
if (mapIds == null || reduceQ == null || jobQ == null) {
sendError(ctx, "Required param job, map and reduce", BAD_REQUEST);
return;
}
if (reduceQ.size() != 1 || jobQ.size() != 1) {
sendError(ctx, "Too many job/reduce parameters", BAD_REQUEST);
return;
}
int reduceId;
String jobId;
try {
reduceId = Integer.parseInt(reduceQ.get(0));
jobId = jobQ.get(0);
} catch (NumberFormatException e) {
sendError(ctx, "Bad reduce parameter", BAD_REQUEST);
return;
} catch (IllegalArgumentException e) {
sendError(ctx, "Bad job parameter", BAD_REQUEST);
return;
}
final String reqUri = request.getUri();
if (null == reqUri) {
// TODO? add upstream?
sendError(ctx, FORBIDDEN);
return;
}
// Generate simple response without security
HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
Channel ch = evt.getChannel();
ch.write(response);
// TODO refactor the following into the pipeline
ChannelFuture lastMap = null;
for (String mapId : mapIds) {
try {
lastMap = sendMapOutput(ctx, ch, jobId, mapId, reduceId);
if (null == lastMap) {
sendError(ctx, NOT_FOUND);
shuffleMetrics.failedOutput();
return;
}
} catch (IOException e) {
LOG.error("Shuffle error ", e);
shuffleMetrics.failedOutput();
sendError(ctx, e.getMessage(), INTERNAL_SERVER_ERROR);
return;
}
}
lastMap.addListener(ChannelFutureListener.CLOSE);
}