[jira] [Created] (ZEPPELIN-4746) Sometimes Zeppelin server stops responding to WS requests

["Artem Plotnikov (Jira)" <ji...@apache.org>]

Artem Plotnikov created ZEPPELIN-4746:
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             Summary: Sometimes Zeppelin server stops responding to WS requests
                 Key: ZEPPELIN-4746
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-4746
             Project: Zeppelin
          Issue Type: Bug
    Affects Versions: 0.8.2
         Environment: [^zeppelin-thread-dump.txt]
            Reporter: Artem Plotnikov
         Attachments: zeppelin-thread-dump.txt

Once in a couple of week we are experiencing the an issue - Zeppelin server stops responding to WebSocket requests from any interpreters (spark, jdbc and so on). 

jcmd <pid> Thread.print` command produces thread dump (in attachement), which is the same for multiple runs with RemoteInterpreterServer.java:275 waiting at remoteInterpreterServer.join(). 

Interpreter restarts didn't take any effect, but server responds to API requests and successfully loads notebooks. In WebSocket console in browser I can see outgoing WebSocket requests, but no response from server.

Also, there is no specific code or routine, which reproduces this issue.



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