Tathagata Das created SPARK-7553:
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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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