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https://issues.apache.org/jira/browse/HDFS-3075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229767#comment-13229767
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Eli Collins commented on HDFS-3075:
-----------------------------------
Sorry, posted to the wrong jira!
> Backport HADOOP-4885 to branch-1
> --------------------------------
>
> Key: HDFS-3075
> URL: https://issues.apache.org/jira/browse/HDFS-3075
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Brandon Li
> Assignee: Brandon Li
> Fix For: 1.1.0
>
>
> 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.
> See also HADOOP-4885.
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