Fall back to a random datanode when bestNode fails
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Key: HDFS-1577
URL: https://issues.apache.org/jira/browse/HDFS-1577
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.23.0
When NameNod decides to redirect a read request to a datanode, if it can not
find a live node that contains a block of the file, NameNode should choose a
random datanode instead of throwing an exception.
This is because a live node test is against its http port. A non-functional
jetty servlet (may due to bug like JETTY-1264) does not mean that the replica
on that DataNode is not readable. Redirecting the read request to a random
datanode could make hftp function better when DataNodes hit bugs like
JETTY-1264.
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