[HBASE-546] Use Zookeeper in HBase

• Type: Improvement
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.20.0
• Assignee: Jean-Daniel Cryans
• Reporter: Bryan Duxbury
• Created: 26/Mar/08 18:28
• Updated: 13/Sep/09 22:24
• Resolved: 30/Mar/09 02:35

Description

Zookeeper =~ Chubby. This means that we could take advantage of a distributed lock manager to coordinate things like failover masters, regionservers staying online when master is dead, atomic region->regionserver assignments, etc. There are a lot of opportunities for improvements here. Please add discussions of particular features in comments or sub-tasks.

Issue Links

• blocks: HBASE-698 HLog recovery is not performed after master failure
• blocks: HBASE-773 Service Historian
• blocks: HBASE-451 Remove HTableDescriptor from HRegionInfo
• blocks: HBASE-1158 Include start code as part of HServerAddress
• is blocked by: HBASE-543 A region's state is kept in several places in the master opening the possibility for race conditions

Sub-Tasks

• Provide a HBase implementation of the Zookeeper interface: Closed
• Add the Zookeeper jar: Closed
• Store the ROOT region location in Zookeeper: Closed
• Make the Region Servers resistent to Master failures: Closed
• Ensure that there is only 1 Master with Zookeeper (part of HA Master): Closed
• Create a wrapper around the Zookeeper startup class for HBase configs: Closed
• Replace the HRS leases with Zookeeper: Closed
• Modify the scripts to use Zookeeper: Closed
• HMsg carries safemode flag; remove: Closed