[HDFS-3795] QJM: validate journal dir at startup

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: QuorumJournalManager (HDFS-3077)
• Fix Version/s: QuorumJournalManager (HDFS-3077)
• Component/s: ha
• Target Version/s: QuorumJournalManager (HDFS-3077)
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 13/Aug/12 21:52
• Updated: 15/Aug/12 00:52
• Resolved: 15/Aug/12 00:52

Description

Currently, the JN does not validate the configured journal directory until it tries to write into it. This is counter-intuitive for users, since they would expect to find out about a misconfiguration at startup time, rather than on first access. Additionally, two testers accidentally configured the journal dir to be a URI, which the code accidentally understood as a relative path (CWD/file:/foo/bar.

We should validate the config at startup to be an accessible absolute path.