https://issues.apache.org/bugzilla/show_bug.cgi?id=55170
Bug ID: 55170
Summary: [websocket][jsr 356]Thread falls in endless cycle when
connection is reset
Product: Tomcat 8
Version: trunk
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: s.bos...@gmail.com
Created attachment 30511
--> https://issues.apache.org/bugzilla/attachment.cgi?id=30511&action=edit
profiling result screenshot
I have a client which opens websocket connection to the echo server example.
My client sends unlimited number of binary messages. At some point, the
connection is closed by a network component in the middle (load balancer). I
can see exception thrown at the client side and the session is closed (see
below <Exception 1>). So far this behaviour seems normal. However, after
closing the session, I noticed there is something that uses CPU time, which
after some profiling turned out to be a thread that executes CPU extensive code
in an endless cycle (see below <Stack trace 1>)
<Exception 1>
Here is the exception that is thrown when the connection falls apart:
Exception is :java.io.IOException: java.util.concurrent.ExecutionException:
java.util.concurrent.ExecutionException: java.io.IOException: The specified
network name is no longer available.
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:203)
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendBytes(WsRemoteEndpointImplBase.java:112)
at
org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendBinary(WsRemoteEndpointBasic.java:43)
at
com.sap.cloud.sample.helloworld.WebsocketsTestManager$TestThread.run(WebsocketsTestManager.java:257)
Caused by: java.util.concurrent.ExecutionException:
java.util.concurrent.ExecutionException: java.io.IOException: The specified
network name is no longer available.
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase$FutureToSendHandler.get(WsRemoteEndpointImplBase.java:719)
at
org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:201)
... 3 more
Caused by: java.util.concurrent.ExecutionException: java.io.IOException: The
specified network name is no longer available.
at sun.nio.ch.PendingFuture.get(PendingFuture.java:185)
at
org.apache.tomcat.websocket.AsyncChannelWrapperSecure$WriteTask.run(AsyncChannelWrapperSecure.java:209)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.io.IOException: The specified network name is no longer
available.
at sun.nio.ch.Iocp.translateErrorToIOException(Iocp.java:309)
at sun.nio.ch.Iocp.access$700(Iocp.java:46)
at sun.nio.ch.Iocp$EventHandlerTask.run(Iocp.java:399)
... 1 more
<Stack trace 1>
Here is the stacktrace of the thread consuming 100% CPU in an endless cycle:
sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:757)
javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:624)
org.apache.tomcat.websocket.AsyncChannelWrapperSecure$ReadTask.run(AsyncChannelWrapperSecure.java:264)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:722)
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