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https://issues.apache.org/jira/browse/HDFS-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14075005#comment-14075005
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Lei (Eddy) Xu commented on HDFS-6729:
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[~aw] and [~cmccabe] Thanks for looking into this issue!
We have customers encountering significant lag time between each decommissioned
node (e.g., pulling data away from each other node), as described by
[~cmccabe]. This significant lag time "_blew users maintenance window_."
So, I am wondering whether it is possible to allow users to set a maintenance
mode for DN for a given time (e.g., the user specifies the maintenance time as
1 hour), after that if the DN does not come back, NN starts the normal
re-replicate process?
> Support maintenance mode for DN
> -------------------------------
>
> Key: HDFS-6729
> URL: https://issues.apache.org/jira/browse/HDFS-6729
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.4.0
> Reporter: Lei (Eddy) Xu
>
> Some maintenance works (e.g., upgrading RAM or add disks) on DataNode only
> takes a short amount of time (e.g., 10 minutes). In these cases, the users do
> not want to report missing blocks on this DN because the DN will be online
> shortly without data lose. Thus, we need a maintenance mode for a DN so that
> maintenance work can be carried out on the DN without having to decommission
> it or the DN being marked as dead.
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