Hi,
We experienced three Zeppelin server hangs today. I have included one of
the stack traces below. It is similar to the stack trace in a websocket
deadlock bug in Jetty 8. From the bug report
<https://bugs.eclipse.org/bugs/show_bug.cgi?id=389645>:
However, Jetty 9 has already refactored the low level read/write on a
> socket heavily to compensate for websocket, spdy, and http/2
> Marking this as WONTFIX for Jetty 7/8
> Use Jetty 9
Is there a workaround? Has anyone tried using Jetty 9 in Zeppelin? What is
the effort involved?
Thanks,
Prasad
*Stack trace*
"pool-1-thread-10" #141 prio=5 os_prio=0 tid=0x0000000001513000 nid=0x6749
in Object.wait() [0x00007fdab6ff4000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at
org.eclipse.jetty.io.nio.SelectChannelEndPoint.blockWritable(SelectChannelEndPoint.java:494)
- locked <0x00000006c50d9b48> (a
org.eclipse.jetty.io.nio.SelectChannelEndPoint)
at
org.eclipse.jetty.io.nio.SslConnection$SslEndPoint.blockWritable(SslConnection.java:723)
at
org.eclipse.jetty.websocket.WebSocketGeneratorRFC6455.flush(WebSocketGeneratorRFC6455.java:248)
at
org.eclipse.jetty.websocket.WebSocketGeneratorRFC6455.addFrame(WebSocketGeneratorRFC6455.java:114)
at
org.eclipse.jetty.websocket.WebSocketConnectionRFC6455$WSFrameConnection.sendMessage(WebSocketConnectionRFC6455.java:439)
at
org.apache.zeppelin.socket.NotebookSocket.send(NotebookSocket.java:89)
at
org.apache.zeppelin.socket.NotebookServer.broadcast(NotebookServer.java:286)
- locked <0x00000006c3a1cd08> (a java.util.HashMap)
at
org.apache.zeppelin.socket.NotebookServer.broadcastNote(NotebookServer.java:370)
at
org.apache.zeppelin.socket.NotebookServer$ParagraphJobListener.afterStatusChange(NotebookServer.java:945)
at org.apache.zeppelin.scheduler.Job.setStatus(Job.java:143)
at
org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.afterStatusChange(RemoteScheduler.java:379)
at
org.apache.zeppelin.scheduler.RemoteScheduler$JobStatusPoller.getStatus(RemoteScheduler.java:261)
- locked <0x00000006c5885178> (a
org.apache.zeppelin.scheduler.RemoteScheduler$JobStatusPoller)
at
org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.run(RemoteScheduler.java:335)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
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)
--
Prasad Wagle
408.476.6261 | twitter.com/prasadwagle | prasadwa...@gmail.com |
www.linkedin.com/in/prasadwagle
