Chao Sun commented on HDFS-13578:

[~xkrogen]: good point. I think we should recommend people to disable the 
access time if they opt for observer reads (which is what we do internally), or 
still direct {{getBlockLocations}} to active if access time is turned on. I've 
seen RPC time suffered when access time is on and {{getBlockLocations}} goes to 
observer. This may need more discussion.

[~elgoiri]: we can use this annotation to check whether the current RPC method 
is readonly or not, by following:
  private boolean isRead(Method method) {
    return method.isAnnotationPresent(ReadOnly.class);

> 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
> 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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