From 686b2c54323407dd3743d3d7b56c6e3b12f52867 Mon Sep 17 00:00:00 2001
From: Alexander Kukushkin <cyberdemn@gmail.com>
Date: Mon, 7 Oct 2019 10:55:26 +0200
Subject: [PATCH] Fix memory leak on python 3.7 (#1200)

Close https://github.com/zalando/patroni/issues/1167
---
 patroni/api.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/patroni/api.py b/patroni/api.py
index 8caec153..60dcb457 100644
--- a/patroni/api.py
+++ b/patroni/api.py
@@ -492,6 +492,8 @@ class RestApiHandler(BaseHTTPRequestHandler):
 
 
 class RestApiServer(ThreadingMixIn, HTTPServer, Thread):
+    # On 3.7+ the `ThreadingMixIn` gathers all non-daemon worker threads in order to join on them at server close.
+    daemon_threads = True  # Make worker threads "fire and forget" to prevent a memory leak.
 
     def __init__(self, patroni, config):
         self.patroni = patroni