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https://issues.apache.org/jira/browse/HDFS-3504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292096#comment-13292096
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Sanjay Radia commented on HDFS-3504:
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* Not sure if exponential backoff is flexible enough. Typically one wants to
retry every 10 sec till about a minute and then retry every 60 sec.
* You forgot about the connection retry.
* Why is MiniDfsCluster changes needed?
> Configurable retry in DFSClient
> -------------------------------
>
> Key: HDFS-3504
> URL: https://issues.apache.org/jira/browse/HDFS-3504
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Siddharth Seth
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h3504_20120607.patch, h3504_20120608.patch
>
>
> When NN maintenance is performed on a large cluster, jobs end up failing.
> This is particularly bad for long running jobs. The client retry policy could
> be made configurable so that jobs don't need to be restarted.
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