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Date: Mon, 2 May 2011 21:17:03 +0000 (UTC)
From: "Eli Collins (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-1850) DN should transmit absolute failed
 volume count rather than increments to the NN
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     [ https://issues.apache.org/jira/browse/HDFS-1850?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HDFS-1850:
------------------------------

    Attachment: hdfs-1850-6.patch

Arg. Right patch this time.

> DN should transmit absolute failed volume count rather than increments to the NN
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-1850
>                 URL: https://issues.apache.org/jira/browse/HDFS-1850
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, name-node
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: 0.22.0
>
>         Attachments: hdfs-1850-1.patch, hdfs-1850-2.patch, hdfs-1850-3.patch, hdfs-1850-4.patch, hdfs-1850-5.patch, hdfs-1850-6.patch
>
>
> The API added in HDFS-811 for the DN to report volume failures to the NN is "inc(DN)". However the given sequence of events will result in the NN forgetting about reported failed volumes:
> # DN loses a volume and reports it
> # NN restarts
> # DN re-registers to the new NN
> A more robust interface would be to have the DN report the total number of volume failures to the NN each heart beat (the same way other volume state is transmitted).
> This will likely be an incompatible change since it requires changing the Datanode protocol.

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