[HDFS-3884] QJM: Journal format() should reset cached values

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: QuorumJournalManager (HDFS-3077)
• Fix Version/s: QuorumJournalManager (HDFS-3077)
• Target Version/s: QuorumJournalManager (HDFS-3077)
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 01/Sep/12 07:34
• Updated: 05/Sep/12 04:29
• Resolved: 05/Sep/12 04:28

Description

Simple bug in the JournalNode: it caches certain values (eg accepted epoch) in memory, and the cached values aren't reset when the journal is formatted. So, after a format, further calls to the same Journal will see the old value for accepted epoch, writer epoch, etc, preventing the journal from being re-used until the JN is restarted.