http/2 server starts dying after rapid refresh
by Michael Hixson
Hello,
I'm trying out HTTP/2 with undertow-core in my application, and I see
that I'm able to get the server into a bad state pretty reliably by
refreshing quickly in my browser. It stops responding to requests and
the CPU usage of the Java process starts to climb towards 100%.
I was able to replicate this in the HTTP/2 example in the latest from
the master branch, by changing the main HttpHandler. This is what I
put in Http2Server#main(String[]):
Undertow server = Undertow.builder()
.setServerOption(UndertowOptions.ENABLE_HTTP2, true)
.setServerOption(UndertowOptions.ENABLE_SPDY, true)
.addHttpListener(8080, bindAddress)
.addHttpsListener(8443, bindAddress, sslContext)
.setHandler(new HttpHandler() {
@Override
public void handleRequest(HttpServerExchange exchange) {
if (exchange.isInIoThread()) {
exchange.dispatch(this);
return;
}
exchange.startBlocking();
exchange.getResponseHeaders().put(
new HttpString("Content-Type"), "text/html");
try (BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(
exchange.getOutputStream(),
StandardCharsets.UTF_8))) {
writer.append("<!DOCTYPE html><html>\n");
for (int i = 0; i < 100; i++) {
writer.append(
"<link rel=\"stylesheet\" href=\"/" + i + ".css\">\n");
}
writer.append("hello");
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}).build();
Then I go to https://localhost:8443/ in a browser and hold down F5 for
a bit. I start seeing errors like this:
java.nio.channels.ClosedChannelException
at io.undertow.server.protocol.framed.AbstractFramedStreamSinkChannel.write(AbstractFramedStreamSinkChannel.java:396)
at org.xnio.channels.Channels.writeFinalBasic(Channels.java:961)
at io.undertow.server.protocol.framed.AbstractFramedStreamSinkChannel.writeFinal(AbstractFramedStreamSinkChannel.java:420)
at org.xnio.conduits.StreamSinkChannelWrappingConduit.writeFinal(StreamSinkChannelWrappingConduit.java:66)
at org.xnio.conduits.ConduitStreamSinkChannel.writeFinal(ConduitStreamSinkChannel.java:104)
at io.undertow.channels.DetachableStreamSinkChannel.writeFinal(DetachableStreamSinkChannel.java:195)
at io.undertow.server.HttpServerExchange$WriteDispatchChannel.writeFinal(HttpServerExchange.java:1882)
at io.undertow.io.UndertowOutputStream.writeBufferBlocking(UndertowOutputStream.java:288)
at io.undertow.io.UndertowOutputStream.close(UndertowOutputStream.java:331)
at sun.nio.cs.StreamEncoder.implClose(StreamEncoder.java:320)
at sun.nio.cs.StreamEncoder.close(StreamEncoder.java:149)
at java.io.OutputStreamWriter.close(OutputStreamWriter.java:233)
at java.io.BufferedWriter.close(BufferedWriter.java:266)
at io.undertow.examples.http2.Http2Server$1.handleRequest(Http2Server.java:94)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:199)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:774)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
In case it helps, I saw a different error in my real (not undertow
example) application when I started seeing the same effects visibly
(site down and CPU climbing to 100%). Maybe it is the same root cause
but just being caught/logged differently:
ERROR [2015-05-28 14:23:59,804] org.xnio.nio: XNIO000011: Task
io.undertow.server.protocol.framed.AbstractFramedChannel$2@308b5f1f
failed with an exception
java.lang.IllegalStateException: null
at io.undertow.server.protocol.framed.AbstractFramedStreamSinkChannel.getBuffer(AbstractFramedStreamSinkChannel.java:523)
~[undertow-core-1.3.0.Beta1-SNAPSHOT.jar:1.3.0.Beta1-SNAPSHOT]
at io.undertow.server.protocol.framed.AbstractFramedChannel.flushSenders(AbstractFramedChannel.java:496)
~[undertow-core-1.3.0.Beta1-SNAPSHOT.jar:1.3.0.Beta1-SNAPSHOT]
at io.undertow.server.protocol.framed.AbstractFramedChannel$2.run(AbstractFramedChannel.java:581)
~[undertow-core-1.3.0.Beta1-SNAPSHOT.jar:1.3.0.Beta1-SNAPSHOT]
at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:560)
~[xnio-nio-3.3.1.Final.jar:3.3.1.Final]
at org.xnio.nio.WorkerThread.run(WorkerThread.java:462)
~[xnio-nio-3.3.1.Final.jar:3.3.1.Final]
I see the same behavior in my real application with both undertow-core
1.2.6.Final and 1.3.0.Beta1-SNAPSHOT (the latter installed locally
from source). I only tried the Http2Server example in the latest
version though.
-Michael
8 years, 10 months
Stand alone undertow or undertow docker image?
by Marc Boorshtein
Are there any plans for a stand alone undertow distro? Or even better
has anyone put together an undertow docker image?
Thanks
Marc Boorshtein
CTO Tremolo Security
marc.boorshtein(a)tremolosecurity.com
(703) 828-4902
8 years, 11 months
A question about response body size limit in undertow
by adi amir
Hello
I'm working with undertow.
I would appreciate help regarding the following issue:
I have a response that have a large body size (about 1.8MB).
It seems that the undertow truncates the response after 100,000~ bytes.
I could not find any configuration parameter to increases this limit nor
a method to overcome this issue.
I would appreciate some tips on this issue.
Thank you
Adi Amir
8 years, 11 months
Server-Sent Event and HttpServerExchange
by Cédric Tran-Xuan
Hello,
We are looking at the recent support of Server-Sent Events in Undertow,
which looks great!
We are using the HttpServerExchange to pass data through different handlers
(we do it by passing these data via setting Attachments to the
HttpServerExchange). Ultimately, we need these data, to determine what to
push to the client via SSE. And as we don't have access to the
HttpServerExchange from the ServerSentEventConnection, we are a bit stuck.
We imagine we can code some « hack » to do so, but first, we were wondering
if ever the dev team had some insights that could help us to implement the
best solution that fits the « Undertow spirit » and our need.
Thanks in advance for your answer.
Best regards,
Cédric.
PS: may be passing data via Attachments of HttpServerExchange is not the
best practice?
8 years, 11 months
