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https://issues.apache.org/jira/browse/HDFS-3075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE reopened HDFS-3075:
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@Uma, you are right that HADOOP-4885 already has fixed this. So this one is a
backport. Will revise the title.
@Eli, this is not a dupe of HDFS-2781.
> Add mechanism to restore the removed storage directories
> --------------------------------------------------------
>
> Key: HDFS-3075
> URL: https://issues.apache.org/jira/browse/HDFS-3075
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.24.0, 1.1.0
> Reporter: Brandon Li
> Assignee: Brandon Li
>
> When a storage directory is inaccessible, namenode removes it from the valid
> storage dir list to a removedStorageDirs list. Those storage directories will
> not be restored when they become healthy again.
> The proposed solution is to restore the previous failed directories at the
> beginning of checkpointing, say, rollEdits, by copying necessary metadata
> files from healthy directory to unhealthy ones. In this way, whenever a
> failed storage directory is recovered by the administrator, he/she can
> immediately force a checkpointing to restored a failed directory.
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