Arun Achuthan created SPARK-21303:
-------------------------------------

             Summary: Web-UI shows some Jobs get stuck randomly and stays like 
that. Neither able to Kill
                 Key: SPARK-21303
                 URL: https://issues.apache.org/jira/browse/SPARK-21303
             Project: Spark
          Issue Type: Bug
          Components: DStreams
    Affects Versions: 2.1.1, 2.1.0
         Environment: Kubernetes 1.4.12 on AWS 
OS Ubuntu
Spark 2.1.1
Cassandra 3.9
            Reporter: Arun Achuthan
             Fix For: 2.1.1


We are running a streaming application which was running without any issues for 
long. Last few days we are seeing some jobs randomly getting stuck on the web 
ui.  This doesn't stop the application as the  following jobs are successful. 
The stuck jobs remain in the web-ui as stuck with no progress. These are the 
observations we made.  At the time the first job is shown stuck on UI  the 
driver logs  mention this

2017-07-04 05:33:20,189 ERROR [dag-scheduler-event-loop] 
org.apache.spark.scheduler.LiveListenerBus: Dropping SparkListenerEvent because 
no remaining room in event queue. This likely means one of the SparkListeners 
is too slow and cannot keep up with the rate at which tasks are being started 
by the scheduler.

For every other random stuck job  the driver logs mention  the below at the 
same time

2017-07-04 05:33:20,194 WARN [dispatcher-event-loop-0] 
org.apache.spark.scheduler.LiveListenerBus: Dropped 1 SparkListenerEvents since 
Thu Jan 01 00:00:00 UTC 1970
 
2017-07-04 05:49:31,571 WARN [dag-scheduler-event-loop] 
org.apache.spark.scheduler.LiveListenerBus: Dropped 1 SparkListenerEvents since 
Tue Jul 04 05:34:20 UTC 2017

After  the jobs starts getting stuck  we are experiencing performance  drops as 
well as scheduling delays within the application. We couldn't find any other 
significant errors in the driver logs.






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