[HBASE-2731] HBase won't start due to NodeExistsException in Zookeeper-based region assignment

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Invalid
• Affects Version/s: 0.90.0
• Fix Version/s: 0.90.0
• Component/s: master
• Assignee: Unassigned
• Reporter: Cosmin Lehene
• Created: 15/Jun/10 14:21
• Updated: 20/Nov/15 12:43
• Resolved: 15/Jun/10 19:25

Description

We're getting zillions of these in HMaster when it starts assigning regions at startup and it doesn't seem to progress.

2010-06-15 06:30:00,287 WARN org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: 
<org.apache.hadoop.hbase.master.HMaster>Failed to create ZNode /hbase/UNASSIGNED/1766164500 in ZooKeeper^D
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /hbase/UNASSIGNED/1766164500^D
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:110)^D
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)^D
        at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:637)^D
        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.createZNodeIfNotExists(ZooKeeperWrapper.java:974)^D
        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.createUnassignedRegion(ZooKeeperWrapper.java:1053)^D
        at org.apache.hadoop.hbase.master.RegionManager.doRegionAssignment(RegionManager.java:355)^D
        at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:312)^D
        at org.apache.hadoop.hbase.master.RegionManager.assignRegionsToMultipleServers(RegionManager.java:292)^D
        at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:221)^D
        at org.apache.hadoop.hbase.master.ServerManager.processMsgs(ServerManager.java:500)^D
        at org.apache.hadoop.hbase.master.ServerManager.processRegionServerAllsWell(ServerManager.java:425)^D
        at org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:335)^D
        at org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:700)^D
        at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)^D
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)^D
        at java.lang.reflect.Method.invoke(Method.java:597)^D
        at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:576)^D
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:919)

Issue Links

• depends upon: HBASE-2694 Move RS to Master region open/close messaging into ZooKeeper