问题解决：Not able to initialize app directories in any of the configured local directories

问题场景

集群之前启用了Kerberos，但是后来为了使用方便，将相关的配置都去除了。在hive上面执行SQL，比如select a from b where a.t ='1';这句简单的SQL都会报错，报错提示如下：

Application application_1581349098902_0008 failed 2 times due to AM Container for appattempt_1581349098902_0008_000002 exited with exitCode: -1000
For more detailed output, check application tracking page:http://namenode01:8088/proxy/application_1581349098902_0008/Then, click on links to logs of each attempt.
Diagnostics: Not able to initialize app directories in any of the configured local directories for app application_1581349098902_0008
Failing this attempt. Failing the application.

问题环境

CDH 5.15.1

问题原因

这个其实是一个权限问题，在yarn初始化作业的时候就报错了。是CDH去除kerberos的时候，未重新更新目录权限，如果之前在kerberos环境下已经用过yarn，已经存在对应的目录。去除kerberos之后，未更新权限，导致新作业失败。未启用kerberos前，/yarn/nm/usercache/test目录权限为yarn:yarn，启用后变成test:yarn，权限不兼容，导致yarn生成日志失败，故作业失败。

解决方案

1. 查找 NodeManager节点
   

2. 获取 yarn.nodemanager.local-dirs
   

3. 到NodeManager的yarn.nodemanager.local-dirs，删除usercache目录

   rm -rf /data01/yarn/nm/usercache/*
   

4. 重启 yarn组件