[HBASE-4478] Improve AssignmentManager.handleRegion so that it can process certain ZK state in the case of RS offline

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.92.0, 0.94.0
• Hadoop Flags: Reviewed
• Assignee: ramkrishna.s.vasudevan
• Reporter: Ming Ma
• Created: 24/Sep/11 04:47
• Updated: 20/Nov/15 11:56
• Resolved: 13/Nov/11 01:35

Description

Currently AssignmentManager.handleRegion skips processing of ZK event change if the RS is offline. It relies on TimeoutMonitor and ServerShutdownHandler to process RIT.

// Verify this is a known server
if (!serverManager.isServerOnline(sn) &&
!this.master.getServerName().equals(sn))

{ LOG.warn("Attempted to handle region transition for server but " + "server is not online: " + Bytes.toString(data.getRegionName())); return; }

For certain states like OPENED, OPENING, FAILED_OPEN, CLOSED, it can continue the progressing even if the RS is offline.