[jira] [Created] (ZEPPELIN-1832) Zombie Interpreter processes

["Ruslan Dautkhanov (JIRA)" <ji...@apache.org>]

Ruslan Dautkhanov created ZEPPELIN-1832:
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             Summary: Zombie Interpreter processes
                 Key: ZEPPELIN-1832
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-1832
             Project: Zeppelin
          Issue Type: Bug
          Components: Core, Interpreters, zeppelin-server
    Affects Versions: 0.7.0
            Reporter: Ruslan Dautkhanov


When we restart Zeppelin server (main process), in many cases, Interpreter 
process keeps running, essential becoming a zombie processes.

In case of Spark interpreter, it also holds SparkContext - consuming server-side resources too.

As discussed in users@ and dev@ mailing lists, other users have confirmed this problem too.

[~luciano resende]
{quote}
I have also seen similar issues even using zeppelin-ddeamon but didn't have much time to investigate the issue when it was happening to me.
{quote}

[~zjffdu]
{quote}
I believe I see this before too.
{quote}

[~bzz@apache.org]
{quote}
Have similar experience, although hard to say what's the reason as all process supposed to killed, as Moon pointed out.
Also noticed that with `mvn tests`, after almost every run, there are 1-2 zombie RemoteInterpreter processes hanging around.
{quote}

@ blaubaer <re...@nzz.ch>
{quote}
We are seeing this problem as well, regularly actually. Especially in
situations when we have many concurrent interpreters running.
{quote}



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