startup.sh -I error "initialize gms failed ..." not written to logfile

运行 startup.sh -I 初始化GMS时，如果出现错误，没有生成日志文件tddl.log

polardbx-server/src/main/java/com/alibaba/polardbx/server/TddlLauncher.java
67 try {
68 initUserAccount(config);
69 initGms(config);
70 initPolarxRootUser(config);
71 System.err.println("Initialize polardbx success");
72 System.exit(0);
73 } catch (SQLException e) {
74 logger.error("initialize gms failed due to: " + e);
75 System.exit(1);
76 }
根据conf/logbak.xml中的配置，此logger会走到asyncROOT appender，由于程序立即退出，日志会来不及写入日志文件（tddl.log）
有两种改法都可以：1）简单的在exit之前增加 e.printStackTrace(); 2）在exit之前Thread.sleep(3000) (我自己的环境sleep 1秒就可以)

Start in polardbx-server/src/main/java/com/alibaba/polardbx/server/TddlLauncher.java at the initGms error handler and review the asyncROOT appender configuration in conf/logbak.xml. Verify the failure path around System.exit(1), then confirm that an initialization error is written to tddl.log or otherwise printed before the process exits.