[HBASE-678] hbase needs a 'safe-mode'

• Type: Improvement
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 0.19.0
• Assignee: Jim Kellerman
• Reporter: Michael Stack
• Created: 10/Jun/08 22:18
• Updated: 13/Sep/09 22:26
• Resolved: 11/Nov/08 23:05

Description

Internally we have a cluster of thousands of regions. We just did a hbase restart w/ master on new node. Just so happened that one of the regionservers was running extra slow (was downloaded by other processes). Meant that its portion of the assigments was taking a long time to come up... While these regions were stuck in deploy mode, the cluster is not useable.

We need a sort of 'safe-mode' in hbase where clients fail if they try to attach to a cluster not yet fully up. UI should show when all assignments have been successfully made so admin can at least see when they have a problematic regionserver in their midst.

Sub-Tasks

• Master and Region Server need to provide root region location if they are using HTable: Closed
• Region balancing during startup makes cluster unstable: Closed
• region close and open processed out of order; makes for disagreement between master and regionserver on region state: Closed
• Enhance web ui to include "safe-mode": Closed