presto-main/src/main/java/io/prestosql/server/ServerMainModule.java/ServerMainModule/createExchangeExecutor
class ServerMainModule:    @Provides
    @Singleton
    @ForExchange
    public static ScheduledExecutorService createExchangeExecutor(ExchangeClientConfig config)
    {
        return newScheduledThreadPool(config.getClientThreads(), daemonThreadsNamed("exchange-client-%s"));
    }