[jira] Commented: (HDFS-457) better handling of volume failure in Data Node storage

["Eli Collins (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934785#action_12934785 ] 

Eli Collins commented on HDFS-457:
----------------------------------

Hey Uma,

Think you're looking at an old patch, all the accesses of removedVols in checkDirs are first checked against null in trunk.

Thanks,
Eli 

> better handling of volume failure in Data Node storage
> ------------------------------------------------------
>
>                 Key: HDFS-457
>                 URL: https://issues.apache.org/jira/browse/HDFS-457
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>             Fix For: 0.21.0
>
>         Attachments: HDFS-457-1.patch, HDFS-457-2.patch, HDFS-457-2.patch, HDFS-457-2.patch, HDFS-457-3.patch, HDFS-457-y20.patch, HDFS-457.patch, HDFS-457_20-append.patch, HDFS_457.patch, jira.HDFS-457.branch-0.20-internal.patch, TestFsck.zip
>
>
> Current implementation shuts DataNode down completely when one of the configured volumes of the storage fails.
> This is rather wasteful behavior because it  decreases utilization (good storage becomes unavailable) and imposes extra load on the system (replication of the blocks from the good volumes). These problems will become even more prominent when we move to mixed (heterogeneous) clusters with many more volumes per Data Node.

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