[ 
https://issues.apache.org/jira/browse/SPARK-2350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Andrew Or updated SPARK-2350:
-----------------------------

    Description: 
... if we launch a driver and there are more waiting drivers to be launched. 
This is because we remove from a list while iterating through this.

{code}
      for (driver <- waitingDrivers) {
        if (worker.memoryFree >= driver.desc.mem && worker.coresFree >= 
driver.desc.cores) {
          launchDriver(worker, driver)
          waitingDrivers -= driver
        }
      }
{code}

  was:... if we launch a driver and there are more waiting drivers to be 
launched. This is because we remove from a list while iterating through this.


> Master throws NPE
> -----------------
>
>                 Key: SPARK-2350
>                 URL: https://issues.apache.org/jira/browse/SPARK-2350
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.1.0
>            Reporter: Andrew Or
>             Fix For: 1.1.0
>
>
> ... if we launch a driver and there are more waiting drivers to be launched. 
> This is because we remove from a list while iterating through this.
> {code}
>       for (driver <- waitingDrivers) {
>         if (worker.memoryFree >= driver.desc.mem && worker.coresFree >= 
> driver.desc.cores) {
>           launchDriver(worker, driver)
>           waitingDrivers -= driver
>         }
>       }
> {code}



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