presto-main/src/main/java/io/prestosql/server/CoordinatorModule.java/CoordinatorModule/createTransactionFinishingExecutor
class CoordinatorModule:    @Provides
    @Singleton
    @ForTransactionManager
    public static ExecutorService createTransactionFinishingExecutor()
    {
        return newCachedThreadPool(daemonThreadsNamed("transaction-finishing-%s"));
    }