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https://issues.apache.org/jira/browse/HDFS-1161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096475#comment-13096475
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Koji Noguchi commented on HDFS-1161:
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bq. IIRC Koji's perspective was that an admin doesn't want to specify the count
or percent of valid volumes
What I wanted was to keep the default behavior of shutting down the datanode
when hitting faulty volume for 0.21 since we were seeing missing blocks after
HDFS-457. I don't have preference between %disks and #disks.
> Make DN minimum valid volumes configurable
> ------------------------------------------
>
> Key: HDFS-1161
> URL: https://issues.apache.org/jira/browse/HDFS-1161
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Eli Collins
> Assignee: Eli Collins
> Priority: Blocker
> Fix For: 0.21.0
>
> Attachments: HDFS-1161-y20.patch, hdfs-1161-1.patch,
> hdfs-1161-2.patch, hdfs-1161-3.patch, hdfs-1161-4.patch, hdfs-1161-5.patch,
> hdfs-1161-6.patch
>
>
> The minimum number of non-faulty volumes to keep the DN active is hard-coded
> to 1. It would be useful to allow users to configure this value so the DN
> can be taken offline when eg half of its disks fail, otherwise it doesn't get
> reported until it's down to it's final disk and suffering degraded
> performance.
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