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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