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Posted to issues@hbase.apache.org by "Jean-Daniel Cryans (JIRA)" <ji...@apache.org> on 2010/07/14 02:11:50 UTC
[jira] Resolved: (HBASE-2781) ZKW.createUnassignedRegion doesn't
make sure existing znode is in the right state
[ https://issues.apache.org/jira/browse/HBASE-2781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jean-Daniel Cryans resolved HBASE-2781.
---------------------------------------
Hadoop Flags: [Reviewed]
Resolution: Fixed
Committed to trunk, thanks for the patch Karthik!
> ZKW.createUnassignedRegion doesn't make sure existing znode is in the right state
> ---------------------------------------------------------------------------------
>
> Key: HBASE-2781
> URL: https://issues.apache.org/jira/browse/HBASE-2781
> Project: HBase
> Issue Type: Bug
> Reporter: Jean-Daniel Cryans
> Assignee: Karthik Ranganathan
> Priority: Critical
> Fix For: 0.90.0
>
> Attachments: HBASE-2781-0.21.patch
>
>
> In ZKW.createUnassignedRegion I see this comment:
> {code}
> // check if this node already exists -
> // - it should not exist
> // - if it does, it should be in the CLOSED state
> {code}
> And what I got is:
> {noformat}
> 2010-06-23 15:42:05,823 INFO [IPC Server handler 3 on 60362] master.ServerManager(457): Processing MSG_REPORT_PROCESS_OPEN: test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464. from h136.sfo.stumble.net,60365,1277332849712; 1 of 4
> 2010-06-23 15:42:05,867 INFO [RegionServer:1.worker] regionserver.HRegionServer$Worker(1338): Worker: MSG_REGION_OPEN: test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:05,870 DEBUG [RegionServer:1.worker] regionserver.RSZookeeperUpdater(157): Updating ZNode /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464 with [RS2ZK_REGION_OPENING] expected version = 0
> 2010-06-23 15:42:05,871 DEBUG [main-EventThread] master.HMaster(1158): Event NodeDataChanged with state SyncConnected with path /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:05,871 DEBUG [main-EventThread] master.ZKMasterAddressWatcher(64): Got event NodeDataChanged with path /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:05,871 DEBUG [main-EventThread] master.ZKUnassignedWatcher(95): ZK-EVENT-PROCESS: Got zkEvent NodeDataChanged state:SyncConnected path:/1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:05,872 INFO [main-EventThread] regionserver.HRegionServer(379): Got ZooKeeper event, state: SyncConnected, type: NodeDataChanged, path: /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:05,872 DEBUG [MASTER_OPENREGION-10.10.1.136:60362-1] handler.MasterOpenRegionHandler(77): Event = RS2ZK_REGION_OPENING, region = 13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:05,874 DEBUG [RegionServer:1.worker] regionserver.HRegion(297): Creating region test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:06,154 INFO [RegionServer:1.worker] regionserver.HRegion(366): Onlined test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.; next sequenceid=1
> 2010-06-23 15:42:06,154 DEBUG [RegionServer:1.worker] regionserver.RSZookeeperUpdater(157): Updating ZNode /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464 with [RS2ZK_REGION_OPENED] expected version = 1\
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:06,249 ERROR [RegionServer:1.worker] regionserver.HRegionServer(1488): Failed to mark region test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464. as opened
> java.io.IOException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:06,993 DEBUG [RegionServer:1] regionserver.HRegionServer(1569): closing region test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:06,993 DEBUG [RegionServer:1] regionserver.HRegion(487): Closing test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.: disabling compactions & flushes
> 2010-06-23 15:42:06,993 DEBUG [RegionServer:1] regionserver.HRegion(512): Updates disabled for region, no outstanding scanners on test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:06,993 DEBUG [RegionServer:1] regionserver.HRegion(519): No more row locks outstanding on region test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:06,994 INFO [RegionServer:1] regionserver.HRegion(531): Closed test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:09,105 INFO [master] master.ProcessServerShutdown(126): Region test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464. was in transition
> name=test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464., state=PENDING_OPEN on dead server h136.sfo.stumble.net,60365,1277332849712 - marking unassigned
> 2010-06-23 15:42:10,065 INFO [IPC Server handler 2 on 60362] master.RegionManager(340): Assigning region test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464. to h136.sfo.stumble.net,60363,1277332849671
> 2010-06-23 15:42:10,067 DEBUG [IPC Server handler 2 on 60362] zookeeper.ZooKeeperWrapper(1079): While creating UNASSIGNED region 13bef4950ac6827ac32d87682b8b2464 exists, state = RS2ZK_REGION_OPENING
> 2010-06-23 15:42:10,126 WARN [IPC Server handler 2 on 60362] zookeeper.ZooKeeperWrapper(1024): <localhost:/1,org.apache.hadoop.hbase.master.HMaster>Failed to create ZNode /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464 in ZooKeeper
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:10,127 DEBUG [IPC Server handler 2 on 60362] master.RegionManager(350): Created UNASSIGNED zNode test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464. in state M2ZK_REGION_OFFLINE
> 2010-06-23 15:42:10,245 INFO [RegionServer:0] regionserver.HRegionServer(511): MSG_REGION_OPEN: test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:11,248 INFO [IPC Server handler 1 on 60362] master.ServerManager(457): Processing MSG_REPORT_PROCESS_OPEN: test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464. from h136.sfo.stumble.net,60363,1277332849671; 7 of 13
> 2010-06-23 15:42:13,795 INFO [RegionServer:0.worker] regionserver.HRegionServer$Worker(1338): Worker: MSG_REGION_OPEN: test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> 2010-06-23 15:42:13,797 ERROR [RegionServer:0.worker] regionserver.RSZookeeperUpdater(107): ZNode /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464 is not in CLOSED/OFFLINE state (state = RS2ZK_REGION_OPENING), will NOT open region.
> 2010-06-23 15:42:13,798 ERROR [RegionServer:0.worker] regionserver.HRegionServer(814): Error opening test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> java.io.IOException: ZNode /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464 is not in CLOSED/OFFLINE state (state = RS2ZK_REGION_OPENING), will NOT open region.
> 2010-06-23 15:42:13,800 ERROR [RegionServer:0.worker] regionserver.RSZookeeperUpdater(141): Aborting open of region 13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:13,800 DEBUG [RegionServer:0.worker] regionserver.RSZookeeperUpdater(157): Updating ZNode /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464 with [RS2ZK_REGION_CLOSED] expected version = 0
> org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion for /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> 2010-06-23 15:42:13,802 ERROR [RegionServer:0.worker] regionserver.HRegionServer(1473): Failed to abort open region test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464.
> java.io.IOException: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion for /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> Caused by: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion for /1/UNASSIGNED/13bef4950ac6827ac32d87682b8b2464
> {noformat}
> Basically:
> # A region server was opening the region
> # It was expired just before reporting that the region is opened, leaving the znode in the state RS2ZK_REGION_OPENING
> # The region gets reassigned, it sees that state, doesn't change it, but still outputs in the end "Created UNASSIGNED zNode test,lll,1277332918248.13bef4950ac6827ac32d87682b8b2464. in state M2ZK_REGION_OFFLINE"
> # When the region server opens the region, it sees that the state is wrong and aborts opening the region
> I think that the way to fix it is to change the state to what it should be.
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