[jira] [Created] (SPARK-7553) Add methods to maintain a singleton StreamingContext

["Tathagata Das (JIRA)" <ji...@apache.org>]

Tathagata Das created SPARK-7553:
------------------------------------

             Summary: Add methods to maintain a singleton StreamingContext 
                 Key: SPARK-7553
                 URL: https://issues.apache.org/jira/browse/SPARK-7553
             Project: Spark
          Issue Type: New Feature
          Components: Streaming
            Reporter: Tathagata Das
            Assignee: Tathagata Das
            Priority: Blocker


In a REPL/notebook environment, its very easy to lose a reference to a StreamingContext by overriding the variable name. So if you happen to execute the following commands
{{
val ssc = new StreamingContext(...)  // cmd 1
ssc.start()                     // cmd 2
...
val ssc = new StreamingContext(...)   // accidentally run cmd 1 again
}}

The value of ssc will be overwritten. Now you can neither start the new context (as only one context can be started), nor stop the previous context (as the reference is lost).

Hence its best to maintain a singleton reference to the active context, so that we never loose reference for the active context. 





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