[HBASE-14861] HBASE_ZNODE_FILE on master server is overwritten by regionserver process in case of master-rs collocation

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: Operability
• Hadoop Flags: Reviewed
• Assignee: Samir Ahmic
• Reporter: Samir Ahmic
• Created: 20/Nov/15 13:04
• Updated: 27/Nov/15 13:48
• Resolved: 24/Nov/15 23:02

Description

In case of master-rs collocation HBASE_ZNODE_FILE is overwritten by regionserver process in HRegionServer#handleReportForDutyResponse() here is how it looks on master server:

[hbase@hnode2 hbase]$ cat hbase-hbase-master.znode 
/hbase/rs/hnode2,16000,1448022074888

it contains regionserver znode path instead of String value of master's ServerName. This affects ZNodeClearer#clear() in way that will not clear master znode in case we detect master crash. At end this will extend failover time until master znode expires configured in zookeeper by maxSessionTimeout parameter (40s in my case).
I have notice this on mater branch but it can be case in other branches where we are collocating master and rs.

Issue Links

• is related to: HBASE-14664 Master failover issue: Backup master is unable to start if active master is killed and started in short time interval