我在搭建集群后,所有服务均可正常启动,但是在测试mapreduce任务的时候,总是提示错误,我在修改了各项配置,可是还是提示错误 以下是报错信息 Number of Maps = 1
Samples per Map = 1
Wrote input for Map #0
Starting Job
2021-1...
解决MySQL删除外键时报错Error Code: 1091. Can't DROP 'XXX'; check that column/key exists ??长期不写基础的 MySQL 代码,笔者也开始犯一些低级错误。最近,笔者在尝试将表中某列的外键约束删除时,MySQL 却一直报该列本就不存在的错误。...
Cause: org.apache.shiro.UnavailableSecurityManagerException: No SecurityManager accessible to the calling code, either bound to the org.apache.shiro.util.ThreadContext or as a vm static singleton. This is an invalid application configuration. 上方报错的几...
启动myvue时,新手常犯错 E:\Web学习\idea\vue>npm run dev
npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path E:\Web学习\idea\vue\package.json
npm ERR! errno -4058
npm ERR! enoent ENOENT: no such file or directory, open 'E:\Web学习\idea\v...