[SPARK-8528] Expose SparkContext.applicationId in PySpark

Use case - we want to log applicationId (YARN in hour case) to request help with troubleshooting from the DevOps

Author: Vladimir Vladimirov <vladimir.vladimirov@magnetic.com>

Closes #6936 from smartkiwi/master and squashes the following commits:

870338b [Vladimir Vladimirov] this would make doctest to run in python3
0eae619 [Vladimir Vladimirov] Scala doesn't use u'...' for unicode literals
14d77a8 [Vladimir Vladimirov] stop using ELLIPSIS
b4ebfc5 [Vladimir Vladimirov] addressed PR feedback - updated docstring
223a32f [Vladimir Vladimirov] fixed test - applicationId is property that returns the string
3221f5a [Vladimir Vladimirov] [SPARK-8528] added documentation for Scala
2cff090 [Vladimir Vladimirov] [SPARK-8528] add applicationId property for SparkContext object in pyspark

1 files changed, 15 insertions, 0 deletions

diff --git a/python/pyspark/context.py b/python/pyspark/context.py
index 90b2fffbb9..d7466729b8 100644
--- a/python/pyspark/context.py
+++ b/python/pyspark/context.py
@@ -292,6 +292,21 @@ class SparkContext(object):
         return self._jsc.version()
 
     @property
+    @ignore_unicode_prefix
+    def applicationId(self):
+        """
+        A unique identifier for the Spark application.
+        Its format depends on the scheduler implementation.
+        (i.e.
+            in case of local spark app something like 'local-1433865536131'
+            in case of YARN something like 'application_1433865536131_34483'
+        )
+        >>> sc.applicationId  # doctest: +ELLIPSIS
+        u'local-...'
+        """
+        return self._jsc.sc().applicationId()
+
+    @property
     def startTime(self):
         """Return the epoch time when the Spark Context was started."""
         return self._jsc.startTime()