[HDFS-884] DataNode makeInstance should report the directory list when failing to start up

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.22.0
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Steve Loughran
• Reporter: Steve Loughran
• Created: 08/Jan/10 18:04
• Updated: 21/Apr/11 23:32
• Resolved: 13/Jan/11 04:16

Description

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.

Issue Links

• is part of: HDFS-890 Have a way of creating datanodes that throws an meaningful exception on failure