[HDFS-2943] Expose last checkpoint time and transaction stats as JMX metrics

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.1
• Fix Version/s: 0.23.2
• Component/s: namenode
• Target Version/s: 0.23.2
• Hadoop Flags: Reviewed
• Assignee: Aaron T. Myers
• Reporter: Aaron T. Myers
• Created: 12/Feb/12 20:37
• Updated: 15/Feb/12 23:04
• Resolved: 14/Feb/12 08:33

Description

I think we should expose at least the following:

• Last checkpoint time
• Transactions since last checkpoint
• Last written transaction

Issue Links

• relates to: HDFS-2955 HA: IllegalStateException during standby startup in getCurSegmentTxId