Xiaoyu Yao created HADOOP-17208:
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             Summary: LoadBalanceKMSClientProvider#deleteKey should 
invalidateCache for all the KMSClientProvider instances
                 Key: HADOOP-17208
                 URL: https://issues.apache.org/jira/browse/HADOOP-17208
             Project: Hadoop Common
          Issue Type: Improvement
    Affects Versions: 2.8.4
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


Without invalidateCache, the deleted key may still exists in the servers' key 
cache (CachingKeyProvider in KMSWebApp.java)  where the delete key was not hit. 
Client may still be able to access encrypted files by specifying to connect to 
KMS instances with a cached version of the deleted key before the cache entry 
(10 min by default) expired. 





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