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https://issues.apache.org/jira/browse/HDFS-13603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16902248#comment-16902248
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Wei-Chiu Chuang commented on HDFS-13603:
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We see this in our internal tests as well. I might spend some time to dig into
this when I get a chance.
> Warmup NameNode EDEK thread 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
> Priority: Major
>
> 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 warmup 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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