[jira] [Created] (TOREE-421) KernelSecurityManager doesn't allow users to create their own thread groups

[Piyush Narang (JIRA)]

Piyush Narang created TOREE-421:
-----------------------------------

             Summary: KernelSecurityManager doesn't allow users to create their 
own thread groups
                 Key: TOREE-421
                 URL: https://issues.apache.org/jira/browse/TOREE-421
             Project: TOREE
          Issue Type: Bug
            Reporter: Piyush Narang


I'm trying to run a Spark Scala job using Toree and I'm running into some 
issues as the code in our job calls into one of our libraries which tries to 
create threads in its own ThreadGroup: 
https://github.com/twitter/util/blob/develop/util-core/src/main/scala/com/twitter/concurrent/NamedPoolThreadFactory.scala#L28

This seems to cause this check in Toree's KernelSecurityManager to trip: 
https://github.com/apache/incubator-toree/blob/master/kernel-api/src/main/scala/org/apache/toree/security/KernelSecurityManager.scala#L121
Stack looks like:
{code}
Name: java.lang.SecurityException
Message: Not allowed to modify ThreadGroups!
StackTrace:   at 
org.apache.toree.security.KernelSecurityManager.checkAccess(KernelSecurityManager.scala:114)
  at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:315)
  at java.lang.Thread.init(Thread.java:394)
  at java.lang.Thread.init(Thread.java:349)
  at java.lang.Thread.<init>(Thread.java:599)
  at 
com.twitter.concurrent.NamedPoolThreadFactory.newThread(NamedPoolThreadFactory.scala:32)
...
{code}

Here's a simple repro:
{code}
println(Thread.currentThread().getThreadGroup) // default thread group
val group: ThreadGroup = new 
ThreadGroup(Thread.currentThread().getThreadGroup(), "name")
val hello = new Thread(group, new Runnable {
    def run() {
    println("hello world")
  }
})
println(hello.getThreadGroup)
hello.start
{code}

Any suggestions for working around this? 



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