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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1553) Hftp file read should retry a different datanode if the chosen best datanode fails to connect to NameNode
Date Wed, 22 Dec 2010 22:51:01 GMT
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: name-node
            Reporter: Hairong Kuang
             Fix For: 0.23.0


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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