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https://issues.apache.org/jira/browse/HDFS-9405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-9405:
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Attachment: HDFS-9405.13.patch
Patch 13 removes the 2 unneeded imports..
> Warmup NameNode EDEK caches in background 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
> Attachments: HDFS-9405.01.patch, HDFS-9405.02.patch,
> HDFS-9405.03.patch, HDFS-9405.04.patch, HDFS-9405.05.patch,
> HDFS-9405.06.patch, HDFS-9405.07.patch, HDFS-9405.08.patch,
> HDFS-9405.09.patch, HDFS-9405.10.patch, HDFS-9405.11.patch,
> HDFS-9405.12.patch, HDFS-9405.13.patch
>
>
> {{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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