Browsing a block on the wrong datanode through web UI has unintuitive results
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Key: HDFS-1579
URL: https://issues.apache.org/jira/browse/HDFS-1579
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0
Reporter: Todd Lipcon
If you navigate through the web UI to view a file, and then the replica you're
looking at is removed, the "Got error in response to OP_READ_BLOCK" message is
printed in the content of the textarea that usually displays the text. This is
confusing to users.
Instead we should display the error message in a different format and direct
the user to choose a different replica from the list of links at the bottom of
the page. Or, alternatively, do an HTTP redirect to a different replica. We
should also take care of the case where the generation stamp has a mismatch.
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