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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7877) Support maintenance state for datanodes
Date Fri, 02 Oct 2015 01:22:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14940676#comment-14940676
] 

Ming Ma commented on HDFS-7877:
-------------------------------

Maybe we should try to support persistence for timeout. We can persist the maintenance expiration
UTC time via some new mechanism discussed in HDFS-9005. The clock can be out of sync among
NNs, but we can accept that given the maintenance timeout precision is in the order of minutes.
[~ctrezzo] [~eddyxu], thought?

> 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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