From 5cbe5412a7caf566a1bee0fcddad7d1d9e3ab8ca Mon Sep 17 00:00:00 2001
From: Pantelis Kouris <ppkouris@gmail.com>
Date: Tue, 3 May 2022 11:40:56 +0200
Subject: [PATCH] Issue 266 (#267)
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* Set pool_pre_ping to True

* added comment for issue #266

Co-authored-by: Dion Häfner <dion.haefner@nbi.ku.dk>

Co-authored-by: Dion Häfner <dion.haefner@nbi.ku.dk>
---
 terracotta/drivers/relational_meta_store.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/terracotta/drivers/relational_meta_store.py b/terracotta/drivers/relational_meta_store.py
index 30c60bf7..794809d3 100644
--- a/terracotta/drivers/relational_meta_store.py
+++ b/terracotta/drivers/relational_meta_store.py
@@ -88,7 +88,9 @@ def __init__(self, path: str) -> None:
             self.url,
             echo=False,
             future=True,
-            connect_args={self.SQL_TIMEOUT_KEY: db_connection_timeout}
+            connect_args={self.SQL_TIMEOUT_KEY: db_connection_timeout},
+            # automatically re-spawn stale connections, see terracotta#266
+            pool_pre_ping=True
         )
         self.sqla_metadata = sqla.MetaData()