[jira] [Created] (ZEPPELIN-1592) Threads not termiated when repeating the notebook execution

[Hyukjin Kwon (JIRA)]

Hyukjin Kwon created ZEPPELIN-1592:
--------------------------------------

             Summary: Threads not termiated when repeating the notebook 
execution
                 Key: ZEPPELIN-1592
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-1592
             Project: Zeppelin
          Issue Type: Bug
    Affects Versions: 0.6.0
         Environment: CentOS release 6.8 (Final)
            Reporter: Hyukjin Kwon


It seems threads are not cleaned and terminated after running multiple times 
the notebooks. For example, I just created a note book and then just ran the 
codes below:

{code}
case class Person(name: String, age: Long)
val df = Seq(Person("Andy", 32)).toDF()
df.show()
{code}

and I found the Zepplin process as below

{code}
iris     20745     1  3 17:45 pts/5    00:00:40 .../java -Dfile.encoding=UTF-8 
-Xms1024m -Xmx1024m -XX:MaxPermSize=512m 
-Dlog4j.configuration=file:///.../zeppelin/conf/log4j.properties 
-Dzeppelin.log.file=.../zeppelin/logs/zeppelin-iris-IRIS-A01.log -cp 
::.../zeppelin/lib/*:.../zeppelin/*::.../zeppelin/conf 
org.apache.zeppelin.server.ZeppelinServer
{code}

and then check the thread count via the command as below:

{code}
ps huH p 20745 | wc -l
{code}

I just realised that it actually never decreases. When I run a notebook, it 
seems it makes two threads but only one of them seems terminated.

{code}
$ ps huH p 20745 | wc -l
56
$ ps huH p 20745 | wc -l
59
$ ps huH p 20745 | wc -l
60
$ ps huH p 20745 | wc -l
60
$ ps huH p 20745 | wc -l
61
$ ps huH p 20745 | wc -l
61
$ ps huH p 20745 | wc -l
63
$ ps huH p 20745 | wc -l
62
$ ps huH p 20745 | wc -l
62
{code}




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