Impact of occasional big pauses in stream processing

[Aggarwal, Ajay]

I was wondering what is the impact if one of the stream operator function 
occasionally takes too long to process the event.  Given the following simple 
flink job

       inputStream
          .KeyBy (“tenantId”)
          .process ( new MyKeyedProcessFunction())

, if occasionally MyKeyedProcessFunction takes too long (say ~5-10 minutes) to 
process an incoming element, what is the impact on overall pipeline? Is the 
impact limited to

  1.  Specific key for which MyKeyedProcessFunction is currently taking too 
long to process an element, or
  2.  Specific Taskslot, where MyKeyedProcessFunction is currently taking too 
long to process an element, i.e. impacting multiple keys, or
  3.  Entire inputstream ?

Also what is the built in resiliency in these cases? Is there a concept of 
timeout for each operator function?

Ajay