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...another thread cleared the same cache. Assuming active record 3.1.1 is supposed to be threadsafe, then the culprit for the issue would be ActiveRecord::ConnectionAdapters::QueryCache, which doesn''t synchronize access to its @query_cache. See https://github.com/awd-switzerland/rails/commit/22aeda0f0553fdcabca156012b67f2aa2add293c for a possible way to resolve that. However, I''m not sure in which layer the rails team wants to handle synchronization. Also notice that the patch is naive in that it simply assumes thread support in ruby to be enabled. Best regards Stefan Rusterholz -- Posted via ht...