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https://issues.apache.org/jira/browse/HDFS-9405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185946#comment-15185946
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Andrew Wang commented on HDFS-9405:
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SGTM, thanks for picking this up Xiao!
> When starting a file, NameNode should generate EDEK in a separate thread
> ------------------------------------------------------------------------
>
> Key: HDFS-9405
> URL: https://issues.apache.org/jira/browse/HDFS-9405
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: encryption, namenode
> Affects Versions: 2.7.1
> Reporter: Zhe Zhang
> Assignee: Xiao Chen
>
> {{generateEncryptedDataEncryptionKey}} involves a non-trivial I/O operation
> to the key provider, which could be slow or cause timeout. It should be done
> as a separate thread so as to return a proper error message to the RPC caller.
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