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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-1553) Hftp file read should retry a different datanode if the chosen best datanode fails to connect to NameNode
Date Tue, 10 Mar 2015 01:49:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer resolved HDFS-1553.
------------------------------------
    Resolution: Won't Fix

hftp is dead

> Hftp file read should retry a different datanode if the chosen best datanode fails to
connect to NameNode
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1553
>                 URL: https://issues.apache.org/jira/browse/HDFS-1553
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Hairong Kuang
>
> Currently when reading a file through HftpFileSystem interface, namenode deterministically
selects the "best" datanode from which the file is read. But this can cause the read to fail
if the best datanode fails to connect to namenode because it never tries another datanode.
> The proposed solution is to send a list of datanode candidates when namenode redirects
the read request to the chosen best datanode. The the datanode could redirect the request
to the next good datanode when it fails to connect to namenode.



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