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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13873) ObserverNode should reject read requests when it is too far behind.
Date Tue, 11 Dec 2018 18:15:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16717689#comment-16717689
] 

Chao Sun commented on HDFS-13873:
---------------------------------

I'm thinking whether we can just try the simplest thing: a time threshold that when exceeded,
will throw a RetriableException and evict the request from the queue. We can perhaps add additional
thresholds such as based on txn ID later to make this smarter.

> 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: Chao Sun
>            Priority: Major
>
> Add a server-side threshold for ObserverNode to reject read requests when it is too far
behind.



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