Fix cache key generation performance for connection pooling (#417)

ElvinEfendi · mattbrictson · commit f3ac49ca372d · 2018-01-28T13:59:42.000-08:00
* change `args.to_s` to `args.hash` for better performance

* update CHANGELOG
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,7 @@ appear at the top.
 ## [Unreleased][]
 
   * Your contribution here!
+  * [#417](https://github.com/capistrano/sshkit/pull/417): Cache key generation for connections becomes slow when `known_hosts` is a valid `net/ssh` options and `known_hosts` file is big. This changes the cache key generation and fixes performance issue - [@ElvinEfendi](https://github.com/ElvinEfendi).
 
 ## [1.15.1][] (2017-11-18)
 
diff --git a/lib/sshkit/backends/connection_pool.rb b/lib/sshkit/backends/connection_pool.rb
@@ -88,7 +88,7 @@ def close_connections
   private
 
   def cache_key_for_connection_args(args)
-    args.to_s
+    args.hash
   end
 
   def cache_enabled?
