项目需要,需要考虑到主机出现问题时候的一些状况,因此需要将主机从机在某些时候进行切换.
但是网上这类的解决方案不多,更多的是通过一些集群进行切换,这里一般都是两台主机,所以还是需要自己办法弄一下.
不多说,直接上代码:
/** 有些时候,为了能够是主从热切换, 启动的redis需要默认为自己的从机, 然后更改为主机或者更改为恢复数据主机的从机之后再更改为主机. */ private static void testTransGusest() { // 连接本地的 Redis 服务 Jedis jedis = new Jedis(rip, rport); Jedis jedis2 = new Jedis(rip2, rport2); startTrans(jedis, jedis2); } private static void startTrans(Jedis jedis, Jedis jedis2) { System.out.println("Start to tran"); long t = 0; boolean atag = true; boolean atag2 = true; boolean ptag = true; boolean ptag2 = true; MyCmdUtil mc= new MyCmdUtil(); String dir="D:\Redis-x64-3.0.504"; for (int i = 0; i < 1;) { try { if ( atag == true&&rpassword != null && rpassword != ""&&"OK".equals(jedis.auth(rpassword)) ) { System.out.println("主机密码验证成功!");// break; atag = false; } if (ptag == true&&"PONG".equals(jedis.ping())) { System.out .println("主机Ping连接测试成功!");// break; System.out.println("切换主机为从机中:"+jedis.slaveof(rip2, rport2)); // System.out.println("切换主机为从机中:"+jedis.slaveofNoOne()); ptag = false; } } catch (Exception e) { // TODO: handle exception System.out.println("Prime Dumped!"); System.out.println(mc.runExecInBack(" "+dir+"\serverstart.bat", null, new File(dir))); } try { if ( atag2 == true&&rpassword2 != null && rpassword2 != ""&&"OK".equals(jedis.auth(rpassword2)) ) { System.out.println("从密码验证成功!");// break; atag2 = false; } if (ptag2 == true&&"PONG".equals(jedis2.ping())) { System.out .println("从机Ping连接测试成功!");// break; System.out.println("切换从机为主机中:"+jedis2.slaveofNoOne()); // System.out.println("切换从机为主机中:"+jedis2.slaveof(rip, rport)); ptag2 = false; } } catch (Exception e) { // TODO: handle exception System.out.println("Vice Dumped!"); } try { if(ptag==false&&ptag2==false) if (jedis.dbSize().equals(jedis.dbSize())) { System.out.println("主从切换并数据同步完成!"); System.out.println(rip+":"+jedis.info("replication")); System.out.println(rip2+":"+jedis2.info("replication")); break; } } catch (Exception e) { // TODO: handle exception System.out.println("Trans failed! Restart to try again!"); } } System.out.println("Trans success!"); } }
这里并没有考虑其他一些出现异常的状况,只是简单的进行切换操作,后面会针对一些特殊的状况,在不影响公司的情况下,进行代码的更新.