DataNode makeInstance should report the directory list when failing to start up
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Key: HDFS-884
URL: https://issues.apache.org/jira/browse/HDFS-884
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Affects Versions: 0.22.0
Reporter: Steve Loughran
Assignee: Steve Loughran
Priority: Minor
When {{Datanode.makeInstance()}} cannot work with one of the directories in
dfs.data.dir, it logs this at warn level (while losing the stack trace).
It should include the nested exception for better troubleshooting. Then, when
all dirs in the list fail, an exception is thrown, but this exception does not
include the list of directories. It should list the absolute path of every
missing/failing directory, so that whoever sees the exception can see where to
start looking for problems: either the filesystem or the configuration.
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