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https://issues.apache.org/jira/browse/HDFS-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HDFS-13873:
---------------------------------------
    Status: Patch Available  (was: Open)

Thanks for the review Erik.

??Javadoc description, for the new parameter on {{#receiveRequestState()}} do 
not match??
 The idea is to make this parameter as generic as possible in 
{{AlignmentContext}} and clarify its usage in the implementation 
{{GlobalStateIdContext}}. We will probably put more subtle logic for the 
no-wait condition, so I want to keep {{AlignmentContext}} description generic.

??adding a new package-private method setLastSeenStateIdForTest()??
 Using mocks and reflections in tests is fine. Adding a setter in an API, when 
the field is not supposed to be modified from the outside is a bad practice. 
Even if its name says "ForTesting".

Fixed all other comments. Mostly cosmetic changes, but let Jenkins run.

> ObserverNode should reject read requests when it is too far behind.
> -------------------------------------------------------------------
>
>                 Key: HDFS-13873
>                 URL: https://issues.apache.org/jira/browse/HDFS-13873
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client, namenode
>    Affects Versions: HDFS-12943
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>            Priority: Major
>         Attachments: HDFS-13873-HDFS-12943.001.patch, 
> HDFS-13873-HDFS-12943.002.patch, HDFS-13873-HDFS-12943.003.patch, 
> HDFS-13873-HDFS-12943.004.patch
>
>
> Add a server-side threshold for ObserverNode to reject read requests when it 
> is too far behind.



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