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https://issues.apache.org/jira/browse/HDFS-11035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16170926#comment-16170926
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Chris Trezzo commented on HDFS-11035:
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+1 HDFS-11035-2.patch looks good to me.
I looked into the above failure and it seems unrelated. Apache Hadoop Client
Packaging Invariants seems to be complaining about all of the duplicate shaded
classes.
> Better documentation for maintenace mode and upgrade domain
> -----------------------------------------------------------
>
> Key: HDFS-11035
> URL: https://issues.apache.org/jira/browse/HDFS-11035
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, documentation
> Affects Versions: 2.9.0
> Reporter: Wei-Chiu Chuang
> Assignee: Ming Ma
> Attachments: HDFS-11035-2.patch, HDFS-11035.patch
>
>
> HDFS-7541 added upgrade domain and HDFS-7877 added maintenance mode. Existing
> documentation about these two features are scarce and the implementation have
> evolved from the original design doc. Looking at code and Javadoc and I still
> don't quite get how I can get datanodes into maintenance mode/ set up a
> upgrade domain.
> File this jira to propose that we write an up-to-date description of these
> two features.
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