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: 0.21.0
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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
