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https://issues.apache.org/jira/browse/HDFS-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei (Eddy) Xu updated HDFS-6729:
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Description:
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.
was: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.
> 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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