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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:
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Status: Patch Available (was: Open)
Here is the patch for the estimate-based approach in Chen's terminology.
I prefer this since the call doesn't even get placed into the queue, just
returns {{RetriableException}} as Chao suggested. I wrote a simple test case
for testing this.
> 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
> Attachments: HDFS-13873-HDFS-12943.001.patch
>
>
> Add a server-side threshold for ObserverNode to reject read requests when it
> is too far behind.
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