Progress indicator should not be negative.

[Smita Deshpande]

Hi,
                I am running the distributed shell example of YARN on apache 
Hadoop 2.4.0.
I have implemented getProgress method in my ApplicationMaster as follows

public float getProgress() {
      // set progress to deliver to RM on next heartbeat
       float progress = 0;
       try{
              progress = (float) numCompletedContainers.get() / 
numTotalContainers.get();
       } catch(Exception _ex) {
              _ex.printStackTrace();
       }
       return progress;
}

While shutting down the application I get following excpetion

- Interrupted while waiting for queue
java.lang.InterruptedException
        at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2017)
        at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2052)
        at 
java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
        at 
org.apache.hadoop.yarn.client.api.async.impl.AMRMClientAsyncImpl$CallbackHandlerThread.run(AMRMClientAsyncImpl.java:275)

When I restart my application I get following error

java.lang.IllegalArgumentException: Progress indicator should not be negative

Because of this, my ApplicationMaster is launched in another container. This 
exception is coming all the time in above scenario.

Can you suggest me what is going wrong?

Thanks,
Smita