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https://issues.apache.org/jira/browse/HDFS-13578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16494018#comment-16494018
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Chao Sun commented on HDFS-13578:
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Hmm... seems there are some other operations that are UNCHECKED and thus
readonly, such as {{refreshNodes}}, {{finalizeUpgrade}}, etc. On a further
thought, I'm thinking whether we should restrict the {{ReadOnly}} annotation to
those methods that are exposed via the {{FileSystem}} class, and exclude others
such as those via {{DfsAdmin}}. It seems there's no big advantage to make the
latter {{ReadOnly}} and have them go through observer.
> Add ReadOnly annotation to methods in ClientProtocol
> ----------------------------------------------------
>
> Key: HDFS-13578
> URL: https://issues.apache.org/jira/browse/HDFS-13578
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-13578-HDFS-12943.000.patch,
> HDFS-13578-HDFS-12943.001.patch, HDFS-13578-HDFS-12943.002.patch,
> HDFS-13578-HDFS-12943.004.patch
>
>
> For those read-only methods in {{ClientProtocol}}, we may want to use a
> {{@ReadOnly}} annotation to mark them, and then check in the proxy provider
> for observer.
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