Detect changes to the run_id when connecting; if observed, reset the script cache

StackExchange.Redis/StackExchange/Redis/DebuggingAids.cs

@@ -101,6 +101,23 @@ Task<string> IRedisAsync.ClientGetNameAsync(CommandFlags flags)
 
     partial class ServerEndPoint
     {
+        private string runId;
+        internal string RunId
+        {
+            get { return runId; }
+            set
+            {
+                if(value != runId) // we only care about changes
+                {
+                    // if we had an old run-id, and it has changed, then the
+                    // server has been restarted; which means the script cache
+                    // is toast
+                    if(runId != null) FlushScriptCache();
+                    runId = value;
+                }
+            }
+        }
+
         internal void SimulateConnectionFailure()
         {
             var tmp = interactive;

StackExchange.Redis/StackExchange/Redis/ResultProcessor.cs

@@ -538,6 +538,10 @@ protected override bool SetResultCore(PhysicalConnection connection, Message mes
                                                 break;
                                         }
                                     }
+                                    else if((val = Extract(line, "run_id:")) != null)
+                                    {
+                                        server.RunId = val;
+                                    }
                                 }
                             }
                         }
@@ -1037,7 +1041,7 @@ public override bool SetResult(PhysicalConnection connection, Message message, R
             {
                 if (result.Type == ResultType.Error && result.AssertStarts(NOSCRIPT))
                 { // scripts are not flushed individually, so assume the entire script cache is toast ("SCRIPT FLUSH")
-                    connection.Bridge.ServerEndPoint.FlushScripts();
+                    connection.Bridge.ServerEndPoint.FlushScriptCache();
                     message.SetScriptUnavailable();
                 }
                 // and apply usual processing for the rest

StackExchange.Redis/StackExchange/Redis/ServerEndPoint.cs

@@ -319,7 +319,7 @@ internal Task Close()
             return result;
         }
 
-        internal void FlushScripts()
+        internal void FlushScriptCache()
         {
             lock (knownScripts)
             {