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Date: Fri, 9 Oct 2009 15:00:32 -0700 (PDT)
From: "Robert Chansler (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 ]

Robert Chansler updated HDFS-457:
---------------------------------

    Release Note: Datanode can continue if a volume for replica storage fails. Previously a datanode resigned if any volume failed.  (was: Do not shutdown datanode if some, but not all, volumes fail.)

Editorial pass over all release notes prior to publication of 0.21.

> 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, 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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