[undertow-dev] http/2 server starts dying after rapid refresh
Michael Hixson
michael.hixson at gmail.com
Tue Jun 2 19:13:24 EDT 2015
Was this Jira issue 461? I'm seeing promising results with this
commit, while if I revert the commit I run into the issue again.
https://github.com/undertow-io/undertow/commit/8f8e1658c5aface7f65a351e985d40c386a3f99b
If so, thanks!
-Michael
On Fri, May 29, 2015 at 10:26 PM, Michael Hixson
<michael.hixson at gmail.com> wrote:
> Also here is a jmap -histo from a little later:
> https://gist.github.com/michaelhixson/de6ede25fdb79a4f25b4
>
> (apologies in advance if gmail sends this email twice like my last one)
>
> -Michael
>
> On Fri, May 29, 2015 at 10:04 PM, Michael Hixson
> <michael.hixson at gmail.com> wrote:
>> Hi Jason,
>>
>> I believe the close() call is coming from me declaring the writer in a
>> try-with-resources statement.
>>
>> Here's a jstack from just now, where my CPU is sitting at 96%:
>> https://gist.github.com/michaelhixson/8a6f2ebf4b167fb1b67e
>>
>> -Michael
>>
>> On Fri, May 29, 2015 at 9:28 PM, Jason T. Greene
>> <jason.greene at redhat.com> wrote:
>>> Hi Michael,
>>>
>>> That stack trace seems to show a close() call to the writer in your handler, but I don't see that call in the code?
>>>
>>> Note that getting I/o exceptions during write and close calls is normal after a client abnormally terminates. You typically just drop the exception (perhaps trace logging).
>>>
>>> Could you get a jstack output under the scenario where you see high CPU load?
>>>
>>>
>>>> On May 28, 2015, at 6:19 PM, Michael Hixson <michael.hixson at gmail.com> wrote:
>>>>
>>>> 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 at 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
>>>> _______________________________________________
>>>> undertow-dev mailing list
>>>> undertow-dev at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/undertow-dev
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