Jean-Daniel Cryans created HBASE-8259:
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Summary: Snapshot backport in 0.94.6 breaks rolling restarts
Key: HBASE-8259
URL: https://issues.apache.org/jira/browse/HBASE-8259
Project: HBase
Issue Type: Bug
Affects Versions: 0.94.6
Reporter: Jean-Daniel Cryans
Assignee: Matteo Bertozzi
Priority: Blocker
Fix For: 0.94.7
[~aleksshulman] found with his nifty QA tools that 0.94.6 has an incompatible
change due to HBASE-7360 (Snapshot 0.94 Backport) that breaks rolling restarts.
RegionTransitionData.write() uses eventType.ordinal() that is the index in the
enum and not the value specified in the enum definition. It means we can't add
new states in the middle of the list. This can be fixed by moving
C_M_SNAPSHOT_TABLE and C_M_RESTORE_SNAPSHOT at the end of the list. Trunk does
the right thing already.
Right now, RIT znodes created with 0.94.6 (or top of the branch) will use the
wrong value for the event type. You will see things like:
{noformat}
2013-04-03 14:57:25,197 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
regionserver:60020-0x13dd1e10dbd0004 Attempting to transition node
70236052/-ROOT- from M_ZK_REGION_OFFLINE to RS_ZK_REGION_OPENING
2013-04-03 14:57:25,201 WARN org.apache.hadoop.hbase.zookeeper.ZKAssign:
regionserver:60020-0x13dd1e10dbd0004 Attempt to transition the unassigned node
for 70236052 from M_ZK_REGION_OFFLINE to RS_ZK_REGION_OPENING failed, the node
existed but was in the state M_SERVER_SHUTDOWN set by the server
192.168.1.112,60020,1365026237977
2013-04-03 14:57:25,201 WARN
org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler: Failed
transition from OFFLINE to OPENING for region=70236052
2013-04-03 14:57:25,201 WARN
org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler: Region was
hijacked? It no longer exists, encodedName=70236052
{noformat}
We should roll a 0.94.6.1 or 0.94.7 as soon this is fixed IMO.
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