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Date: Fri, 12 Aug 2011 06:12:27 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2186) DN volume failures on startup are
 not counted
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    [ https://issues.apache.org/jira/browse/HDFS-2186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13083962#comment-13083962 ] 

Hudson commented on HDFS-2186:
------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #831 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/831/])
    HDFS-2186. DN volume failures on startup are not counted. Contributed by Eli Collins

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1156974
Files : 
* /hadoop/common/trunk/hdfs/CHANGES.txt
* /hadoop/common/trunk/hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeFailureToleration.java
* /hadoop/common/trunk/hdfs/src/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java


> DN volume failures on startup are not counted
> ---------------------------------------------
>
>                 Key: HDFS-2186
>                 URL: https://issues.apache.org/jira/browse/HDFS-2186
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 0.23.0
>
>         Attachments: hdfs-2186-1.patch, hdfs-2186-2.patch
>
>
> Volume failures detected on startup are not currently counted/reported as such. Eg if you have configured 4 volumes, 2 tolerated failures, and you start a DN with two failed volumes it will come up and report (to the NN) no failed volumes. The DN will still be able to tolerate 2 additional volume failures (ie it's OK with no valid volumes remaining). The intent of the volume failure toleration config value is that if more than this # of volumes of the total set of configured volumes have failed the DN should shutdown, therefore volume failures detected on startup should count against this quota. 

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