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Posted to hdfs-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2010/12/22 23:51:01 UTC

[jira] Created: (HDFS-1553) Hftp file read should retry a different datanode if the chosen best datanode fails to connect to NameNode

Hftp file read should retry a different datanode if the chosen best datanode fails to connect to NameNode
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                 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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