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https://issues.apache.org/jira/browse/HDFS-7877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14739108#comment-14739108
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Ming Ma commented on HDFS-7877:
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For the open issues around timeout and persistence, [~ctrezzo] [~eddyxu] and I
had some offline discussion. We also discussed with our admins. Appreciate
input from others.
* Timeout support. We should support it.
* Persistence vs soft state. Persistence is desirable for some cases. But soft
state is acceptable. From application's point of view, if it asks HDFS to
timeout the maintenance state and ideally would like HDFS to honor the request
(applications don't care failover and restart as long as HDFS is up). Soft
state means HDFS wouldn't honor the timeout value if there are NN
failover/restart. For some scenarios admins would prefer if HDFS can honor the
request if there are any NN failover/restart; but they can also accept soft
state approach.
> Support maintenance state for datanodes
> ---------------------------------------
>
> Key: HDFS-7877
> URL: https://issues.apache.org/jira/browse/HDFS-7877
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Ming Ma
> Attachments: HDFS-7877-2.patch, HDFS-7877.patch,
> Supportmaintenancestatefordatanodes-2.pdf,
> Supportmaintenancestatefordatanodes.pdf
>
>
> This requirement came up during the design for HDFS-7541. Given this feature
> is mostly independent of upgrade domain feature, it is better to track it
> under a separate jira. The design and draft patch will be available soon.
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