Tathagata Das 91fbd93f26 [SPARK-7553] [STREAMING] Added methods to maintain a singleton StreamingContext ... 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. Since this problem occurs useful in REPL environments, its best to add this as an Experimental support in the Scala API only so that it can be used in Scala REPLs and notebooks. Author: Tathagata Das <tathagata.das1565@gmail.com> Closes #6070 from tdas/SPARK-7553 and squashes the following commits: 731c9a1 [Tathagata Das] Fixed style a797171 [Tathagata Das] Added more unit tests 19fc70b [Tathagata Das] Added :: Experimental :: in docs 64706c9 [Tathagata Das] Fixed test 634db5d [Tathagata Das] Merge remote-tracking branch 'apache-github/master' into SPARK-7553 3884a25 [Tathagata Das] Fixing test bug d37a846 [Tathagata Das] Added getActive and getActiveOrCreate (cherry picked from commit 00e7b09a0b) Signed-off-by: Tathagata Das <tathagata.das1565@gmail.com>		2015-05-12 16:44:27 -07:00
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src	[SPARK-7553] [STREAMING] Added methods to maintain a singleton StreamingContext	2015-05-12 16:44:27 -07:00
pom.xml	[SPARK-7485] [BUILD] Remove pyspark files from assembly.	2015-05-12 01:39:28 -07:00