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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-457) better handling of volume failure in Data Node storage
Date Fri, 14 Aug 2009 21:29:16 GMT

     [ https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE updated HDFS-457:
----------------------------------------

    Attachment: TestFsck.zip

TestFsck.zip: downloaded the log file from the build and extracted TestFsck log.

The log is unexpectedly long, which has 34MB.  Could you take a look, Boris?

> 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: Bug
>          Components: data-node
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>         Attachments: HDFS-457-1.patch, HDFS-457-2.patch, HDFS-457-2.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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