[SPARK-6667] [PySpark] remove setReuseAddress

The reused address on server side had caused the server can not acknowledge the connected connections, remove it.

This PR will retry once after timeout, it also add a timeout at client side.

Author: Davies Liu <davies@databricks.com>

Closes #5324 from davies/collect_hang and squashes the following commits:

e5a51a2 [Davies Liu] remove setReuseAddress
7977c2f [Davies Liu] do retry on client side
b838f35 [Davies Liu] retry after timeout

(cherry picked from commit 0cce545)
Signed-off-by: Josh Rosen <joshrosen@databricks.com>

core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala

@@ -623,7 +623,6 @@ private[spark] object PythonRDD extends Logging {
    */
   private def serveIterator[T](items: Iterator[T], threadName: String): Int = {
     val serverSocket = new ServerSocket(0, 1)
-    serverSocket.setReuseAddress(true)
     // Close the socket if no connection in 3 seconds
     serverSocket.setSoTimeout(3000)
 

python/pyspark/rdd.py

@@ -114,6 +114,7 @@ def _parse_memory(s):
 
 def _load_from_socket(port, serializer):
     sock = socket.socket()
+    sock.settimeout(3)
     try:
         sock.connect(("localhost", port))
         rf = sock.makefile("rb", 65536)