Rename top-level 'pyspark' directory to 'python'

1 files changed, 38 insertions, 0 deletions

diff --git a/python/pyspark/java_gateway.py b/python/pyspark/java_gateway.py
new file mode 100644
index 0000000000..2329e536cc
--- /dev/null
+++ b/python/pyspark/java_gateway.py
@@ -0,0 +1,38 @@
+import os
+import sys
+from subprocess import Popen, PIPE
+from threading import Thread
+from py4j.java_gateway import java_import, JavaGateway, GatewayClient
+
+
+SPARK_HOME = os.environ["SPARK_HOME"]
+
+
+def launch_gateway():
+    # Launch the Py4j gateway using Spark's run command so that we pick up the
+    # proper classpath and SPARK_MEM settings from spark-env.sh
+    command = [os.path.join(SPARK_HOME, "run"), "py4j.GatewayServer",
+               "--die-on-broken-pipe", "0"]
+    proc = Popen(command, stdout=PIPE, stdin=PIPE)
+    # Determine which ephemeral port the server started on:
+    port = int(proc.stdout.readline())
+    # Create a thread to echo output from the GatewayServer, which is required
+    # for Java log output to show up:
+    class EchoOutputThread(Thread):
+        def __init__(self, stream):
+            Thread.__init__(self)
+            self.daemon = True
+            self.stream = stream
+
+        def run(self):
+            while True:
+                line = self.stream.readline()
+                sys.stderr.write(line)
+    EchoOutputThread(proc.stdout).start()
+    # Connect to the gateway
+    gateway = JavaGateway(GatewayClient(port=port), auto_convert=False)
+    # Import the classes used by PySpark
+    java_import(gateway.jvm, "spark.api.java.*")
+    java_import(gateway.jvm, "spark.api.python.*")
+    java_import(gateway.jvm, "scala.Tuple2")
+    return gateway