@bbreak thanks, I will try. In my case, I wan't call close to close a statement. execute and close will call in different thread. So Why synchronized both close and execute? Now close will not work before execute complete
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I use Impala JDBC to query, I find close() and execute() with synchronized. So if I invoke close() in other thread will wait execute() ，because if execute() is running，close() will blocked waiting for lock. So I should invoke cancal() before close() to avoid block?
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