zhengchenyu commented on PR #6068:
URL: https://github.com/apache/hadoop/pull/6068#issuecomment-1719245764
There are three ways to solve this problem:
1. Call forceKillApplication on all sub cluster.
2. Store secondary sub cluster when submit unmanaged application, then
forceKillApplication on these secondary sub cluster.
3. forceKillApplication to secondary sub cluster when application is removed
in nodemanager.
Solution 1 is the easiest way. But we may call
forceKillApplication to unused sub cluster. And If we kill application to
home subcluster but not router, the app in secondary cluster will not be
removed.
Solution 2: The problem is that NM will store the meta info of app. Router
does not know when NM store the info. So we must disable the cache.
Here I will choose solution 3. UAM is managed by NM, so this solution is
most reasonable.
This PR is about solution 3.
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