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Date: Tue, 29 Jun 2010 03:26:53 -0400 (EDT)
From: "Jeff Zhang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-457) better handling of volume failure in
 Data Node storage
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     [ https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jeff Zhang updated HDFS-457:
----------------------------

    Attachment: HDFS_457.patch

Attach patch. Do checkDiskError in BlockReceiver before allocating volumes for the new block. So after checkDiskError, it is guaranteed that the volumes are all normal, the failed volumes has been removed.


> 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.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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