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From "bijaya (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8955) Support 'hedged' write in DFSClient
Date Wed, 26 Aug 2015 03:55:45 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

bijaya updated HDFS-8955:
    Affects Version/s:     (was: 3.0.0)

> Support 'hedged' write in DFSClient
> -----------------------------------
>                 Key: HDFS-8955
>                 URL: https://issues.apache.org/jira/browse/HDFS-8955
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 2.6.0
>            Reporter: bijaya
>            Assignee: bijaya
> We do have hedged read which serves redundancy on read failures due to bad sector/patch
in disk. We need to have similar feature for hdfs write. This feature may come with cost but
its something to must have for use case which needs to guarantee write success regardless
of degraded disk health. Defination of degraded disk is highly debatable but this is what
I would define. "Degraded disk is the disk which fails to read and write intermittently"

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