Antony Jay created HDFS-13603:
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             Summary: Warmup NameNode EDEK caches retries continuously if 
there's an invalid key 
                 Key: HDFS-13603
                 URL: https://issues.apache.org/jira/browse/HDFS-13603
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: encryption, namenode
    Affects Versions: 2.8.0
            Reporter: Antony Jay


https://issues.apache.org/jira/browse/HDFS-9405 adds a background thread to 
pre-warm EDEK cache. 

However this fails and retries continuously if key retrieval fails for one 
encryption zone. In our usecase, we have temporarily removed keys for certain 
encryption zones.  Currently namenode and kms log is filled up with errors 
related to background thread retrying for ever .

The pre-warm thread should
 * Continue to refresh other encryption zones even if it fails for one
 * Should retry only if it fails for all encryption zones, which will be the 
case when kms is down.

 



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