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Date: Wed, 24 Oct 2012 17:20:13 +0000 (UTC)
From: "Daryn Sharp (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3704) In the DFSClient, Add the node to
 the dead list when the ipc.Client calls fails
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    [ https://issues.apache.org/jira/browse/HDFS-3704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483409#comment-13483409 ] 

Daryn Sharp commented on HDFS-3704:
-----------------------------------

Your explanation sounds reasonable but I don't feel that I know the intricacies well enough to approve this jira.  The smallest bug fixes inevitably break something depending on the bug, so I'll defer to a hdfs expert.
                
> In the DFSClient, Add the node to the dead list when the ipc.Client calls fails
> -------------------------------------------------------------------------------
>
>                 Key: HDFS-3704
>                 URL: https://issues.apache.org/jira/browse/HDFS-3704
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 1.0.3, 2.0.0-alpha
>            Reporter: nkeywal
>            Priority: Minor
>         Attachments: HADOOP-3704.patch
>
>
> The DFSCLient maintains a list of dead node per input steam. When creating this DFSInputStream, it may connect to one of the nodes to check final block size. If this call fail, this datanode should be put in the dead nodes list to save time. If not it will be retried for the block transfer during the read, and we're likely to get a timeout.

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