From 6a6ec36d635ec49d156f37e9c91d39620c6dc02f Mon Sep 17 00:00:00 2001
From: Vitaly Baranov <vitbar@yandex-team.ru>
Date: Thu, 23 Jan 2020 16:35:12 +0300
Subject: [PATCH] Fix race when executing SYSTEM RELOAD ALL DICTIONARIES.

---
 dbms/src/Interpreters/ExternalLoader.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dbms/src/Interpreters/ExternalLoader.cpp b/dbms/src/Interpreters/ExternalLoader.cpp
index e9cfe602437..a96f64c110f 100644
--- a/dbms/src/Interpreters/ExternalLoader.cpp
+++ b/dbms/src/Interpreters/ExternalLoader.cpp
@@ -540,6 +540,7 @@ public:
 
     Strings getAllTriedToLoadNames() const
     {
+        std::lock_guard lock{mutex};
         Strings names;
         for (auto & [name, info] : infos)
             if (info.triedToLoad())