File use-threadpool-from-multiprocessing.pool-to-avoid-le.patch of Package salt.16897

From 1f50b796dd551c25a8fc87fe825d1508f340858e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pablo=20Su=C3=A1rez=20Hern=C3=A1ndez?=
 <psuarezhernandez@suse.com>
Date: Tue, 30 Apr 2019 10:51:42 +0100
Subject: [PATCH] Use ThreadPool from multiprocessing.pool to avoid
 leakings

---
 salt/grains/core.py | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/salt/grains/core.py b/salt/grains/core.py
index 4600f055dd..f1e3ebe9d2 100644
--- a/salt/grains/core.py
+++ b/salt/grains/core.py
@@ -27,7 +27,7 @@ import datetime
 import warnings
 import time
 
-from multiprocessing.dummy import Pool as ThreadPool
+from multiprocessing.pool import ThreadPool
 
 # pylint: disable=import-error
 try:
@@ -2300,10 +2300,14 @@ def fqdns():
     # Create a ThreadPool to process the underlying calls to 'socket.gethostbyaddr' in parallel.
     # This avoid blocking the execution when the "fqdn" is not defined for certains IP addresses, which was causing
     # that "socket.timeout" was reached multiple times secuencially, blocking execution for several seconds.
-    pool = ThreadPool(8)
-    results = pool.map(_lookup_fqdn, addresses)
-    pool.close()
-    pool.join()
+
+    try:
+       pool = ThreadPool(8)
+       results = pool.map(_lookup_fqdn, addresses)
+       pool.close()
+       pool.join()
+    except Exception as exc:
+       log.error("Exception while creating a ThreadPool for resolving FQDNs: %s", exc)
 
     for item in results:
         if item:
-- 
2.16.4