Set client prefetch threads to 1 to prevent deadlock at exit

wiggzz · wiggzz · commit 4e1cd199d1f7 · 2025-10-03T13:52:01.000-05:00
diff --git a/dbt-snowflake/src/dbt/adapters/snowflake/connections.py b/dbt-snowflake/src/dbt/adapters/snowflake/connections.py
@@ -394,6 +394,7 @@ def connect():
                     application="dbt",
                     insecure_mode=creds.insecure_mode,
                     session_parameters=session_parameters,
+                    client_prefetch_threads=1, # disable client prefetch because it can cause deadlock at exit, see https://github.com/snowflakedb/snowflake-connector-python/issues/2213
                     **creds.auth_args(),
                 )
 

Original file line number	Diff line number	Diff line change
`@@ -394,6 +394,7 @@ def connect():`
`394`	`394`	`application="dbt",`
`395`	`395`	`insecure_mode=creds.insecure_mode,`
`396`	`396`	`session_parameters=session_parameters,`
	`397`	`+ client_prefetch_threads=1, # disable client prefetch because it can cause deadlock at exit, see https://github.com/snowflakedb/snowflake-connector-python/issues/2213`
`397`	`398`	`**creds.auth_args(),`
`398`	`399`	`)`
`399`	`400`