[jira] Created: (HDFS-979) FSImage should specify which dirs are missing when refusing to come up

["Steve Loughran (JIRA)" <ji...@apache.org>]

FSImage should specify which dirs are missing when refusing to come up
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                 Key: HDFS-979
                 URL: https://issues.apache.org/jira/browse/HDFS-979
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.22.0
            Reporter: Steve Loughran
            Priority: Minor


When {{FSImage}} can't come up as either it has no data or edit dirs, it tells me this
{code}
java.io.IOException: All specified directories are not accessible or do not exist.
{code}
What it doesn't do is say which of the two attributes are missing. This would be beneficial to anyone trying to track down the problem. Also, I don't think the message is correct. It's bailing out because dataDirs.size() == 0 || editsDirs.size() == 0 , because a list is empty -not because the dirs aren't there, as there hasn't been any validation yet.

More useful would be
# Explicit mention of which attributes are null
# Declare that this is because they are not in the config

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