[jira] [Resolved] (HDFS-3075) Backport HADOOP-4885 to branch-1

["Tsz Wo (Nicholas), SZE (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-3075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE resolved HDFS-3075.
------------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.1.0
     Hadoop Flags: Reviewed

I have committed this (the patch was posted on HADOOP-4885.)  Thanks, Brandon!
                
> 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
>    Affects Versions: 0.24.0, 1.1.0
>            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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