maxiaoxian commented on issue #3121: can't use HintManager.getInstance().setMasterRouteOnly() URL: https://github.com/apache/incubator-shardingsphere/issues/3121#issuecomment-535468000 for HintManager.getInstance() , in 4.0.0-RC2 version . add Preconditions.checkState for check . so，it need manual close or use try...catch... ？
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