I think this is the relevant section:
2010-09-21 15:42:11,986 INFO org.apache.hadoop.hbase.master.ServerManager:
Received start message from: HadoopNode41,60020,1285098132069
2010-09-21 15:42:11,989 INFO org.apache.hadoop.hbase.master.ServerManager:
Received start message from: HadoopNode38,60020,1285098131987
2010-09-21 15:42:11,989 DEBUG
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Updated ZNode
/hbase/rs/1285098132069 with data 10.214.7.223:60020
2010-09-21 15:42:11,996 DEBUG
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Updated ZNode
/hbase/rs/1285098131987 with data 10.209.206.15:60020
2010-09-21 15:42:13,001 DEBUG org.apache.hadoop.hbase.master.RegionManager:
Assigning for address: 10.209.206.15:60020, startcode: 1285098131987, load:
(requests=0, regions=0, usedHeap=32, maxHeap=5195): total nregions to
assign=1, regions to give other servers than this=0, isMetaAssign=true
2010-09-21 15:42:13,001 DEBUG org.apache.hadoop.hbase.master.RegionManager:
Assigning address: 10.209.206.15:60020, startcode: 1285098131987, load:
(requests=0, regions=0, usedHeap=32, maxHeap=5195) 1 regions
2010-09-21 15:42:13,001 INFO org.apache.hadoop.hbase.master.RegionManager:
Assigning region -ROOT-,,0 to HadoopNode38,60020,1285098131987
2010-09-21 15:42:13,085 INFO org.apache.hadoop.hbase.master.ServerManager:
Processing MSG_REPORT_OPEN: -ROOT-,,0 from HadoopNode38,60020,1285098131987;
1 of 1
2010-09-21 15:42:13,130 WARN
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Failed to create out of
safe mode in ZooKeeper:
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
NodeExists for /hbase/safe-mode
2010-09-21 15:42:13,130 INFO
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Node exists; just move
on
2010-09-21 15:42:13,130 INFO org.apache.hadoop.hbase.master.RegionManager:
exiting safe mode
2010-09-21 15:42:13,132 DEBUG
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: SetData of ZNode
/hbase/root-region-server with 10.209.206.15:60020
2010-09-21 15:42:13,133 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.rootScanner scanning meta region {server: 10.209.206.15:60020,
regionname: -ROOT-,,0, startKey: <>}
2010-09-21 15:42:13,223 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.rootScanner scan of 0 row(s) of meta region {server:
10.209.206.15:60020, regionname: -ROOT-,,0, startKey: <>} complete
2010-09-21 15:42:13,466 INFO org.apache.hadoop.hbase.master.ServerManager:
Received start message from: HadoopNode40,60020,1285098133450
2010-09-21 15:42:13,468 DEBUG
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Updated ZNode
/hbase/rs/1285098133450 with data 10.192.66.240:60020
2010-09-21 15:42:13,828 INFO org.apache.hadoop.hbase.master.ServerManager:
Received start message from: HadoopNode39,60020,1285098133654
2010-09-21 15:42:13,830 DEBUG
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Updated ZNode
/hbase/rs/1285098133654 with data 10.206.26.95:60020
2010-09-21 15:43:10,256 INFO org.apache.hadoop.hbase.master.ServerManager: 4
region servers, 0 dead, average load 0.25
2010-09-21 15:43:10,341 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.rootScanner scanning meta region {server: 10.209.206.15:60020,
regionname: -ROOT-,,0, startKey: <>}
2010-09-21 15:43:10,345 INFO org.apache.hadoop.hbase.master.BaseScanner:
RegionManager.rootScanner scan of 0 row(s) of meta region {server:
10.209.206.15:60020, regionname: -ROOT-,,0, startKey: <>} complete
2010-09-21 15:43:10,354 INFO org.apache.hadoop.hbase.master.BaseScanner: All
0 .META. region(s) scanned
2010-09-21 15:43:56,351 INFO org.apache.zookeeper.ZooKeeper: Initiating
client connection, connectString=10.249.107.223:2181 sessionTimeout=60000
watcher=org.apache.hadoop.hbase.client.hconnectionmanager$clientzkwatc...@72898540
2010-09-21 15:43:56,352 INFO org.apache.zookeeper.ClientCnxn: Attempting
connection to server /10.249.107.223:2181
2010-09-21 15:43:56,362 INFO org.apache.zookeeper.ClientCnxn: Priming
connection to java.nio.channels.SocketChannel[connected local=/
10.249.107.223:56828remote=/10.249.107.223:2181]
2010-09-21 15:43:56,380 INFO org.apache.zookeeper.ClientCnxn: Server
connection successful
On Tue, Sep 21, 2010 at 6:05 PM, Stack <[email protected]> wrote:
> Ok. So .META. is there. What is in your master log on startup? Its
> supposed to assign out -ROOT- and .META. (when .META. is assigned
> it'll add row to -ROOT-). I'd say hold off on any of the trickery
> described in the first mail till we see snippet from your master log.
> Lets figure why not assigning .META. before we do any messing.
>
> Thanks,
> St.Ack
>
> On Tue, Sep 21, 2010 at 2:52 PM, Matt Corgan <[email protected]> wrote:
> > Thanks for responding Stack. In a 4 slave cluster (rf=3) cluster we
> > disabled an hdfs/hbase node which also seemed to make a second
> regionserver
> > crash. I'm not sure exactly what went wrong.
> >
> > There is data in the .META. directory
> >
> > [r...@hadoop Master(hadoopmaster):/mnt/hadoop-0.20.2] bin/hadoop fs -lsr
> > /hbase/.META.
> > drwxr-xr-x - root supergroup 0 2010-09-20 16:44
> > /hbase/.META./1028785192
> > -rw-r--r-- 3 root supergroup 932 2010-09-20 14:25
> > /hbase/.META./1028785192/.regioninfo
> > drwxr-xr-x - root supergroup 0 2010-09-21 15:41
> > /hbase/.META./1028785192/info
> > -rw-r--r-- 3 root supergroup 5018 2010-09-21 15:41
> > /hbase/.META./1028785192/info/4694688683869779325
> > -rw-r--r-- 3 root supergroup 0 2010-09-21 14:48
> > /hbase/.META./1028785192/info/6832908118284006198
> > -rw-r--r-- 3 root supergroup 228130 2010-09-21 14:44
> > /hbase/.META./1028785192/info/7773537252698623585
> > drwxr-xr-x - root supergroup 0 2010-09-21 14:44
> > /hbase/.META./compaction.dir
> >
> >
> > but it appears the -ROOT- region is empty. If i scan '-ROOT-' in the
> hbase
> > shell i get:
> >
> > hbase(main):001:0> scan '-ROOT-'
> > ROW COLUMN+CELL
> > 0 row(s) in 0.0840 seconds
> >
> >
> > even though it appears -ROOT- exists in hdfs. Any idea why ROOT would
> not
> > get loaded from hdfs after a master restart?
> >
> > [r...@hadoop Master(hadoopmaster):/mnt/hadoop-0.20.2] bin/hadoop fs -lsr
> > /hbase/-ROOT-
> > drwxr-xr-x - root supergroup 0 2010-09-21 14:50
> > /hbase/-ROOT-/70236052
> > -rw-r--r-- 3 root supergroup 618 2010-09-21 14:50
> > /hbase/-ROOT-/70236052/.regioninfo
> > drwxr-xr-x - root supergroup 0 2010-09-21 15:41
> > /hbase/-ROOT-/70236052/info
> > -rw-r--r-- 3 root supergroup 489 2010-09-21 15:41
> > /hbase/-ROOT-/70236052/info/308400263036654323
> > -rw-r--r-- 3 root supergroup 462 2010-09-21 13:43
> > /hbase/-ROOT-/70236052/info/8250773031047005400
> >
> >
> > I'll just follow your suggestion of generating a new .META. and copying
> > over. Thanks,
> >
> > Matt
> >
> >
> > On Tue, Sep 21, 2010 at 5:20 PM, Stack <[email protected]> wrote:
> >
> >> On Tue, Sep 21, 2010 at 1:07 PM, Matt Corgan <[email protected]>
> wrote:
> >> > Is there a way to create a new .META. table if I lost it? For
> example,
> >> I'm
> >> > getting this exception everywhere:
> >> >
> >> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> (NativeException)
> >> >
> >>
> >> How'd you do that? Thats pretty impressive.
> >>
> >> >
> >> > The add_table script doesn't appear to handle .META., giving this
> error:
> >> >
> >> > java.lang.IllegalArgumentException: Illegal first character <46> at 0.
> >> > User-space table names can only start with 'word characters': i.e.
> >> > [a-zA-Z_0-9]: .META.
> >> >
> >> >
> >> > And the hbase shell will only create user-space table names.
> Restarting
> >> the
> >> > hbase master also does not appear to re-create it.
> >> >
> >> > I'm using 0.20.6.
> >> >
> >> Whats the master log look like when you start up hbase? Whats it say
> >> about missing .META.?
> >>
> >> If you do a
> >>
> >> $ bin/hadoop fs -lsr /hbase/.META.
> >>
> >> ... is there anything in your filesystem?
> >>
> >> If nothing there, one thing you could do is run an hbase elsewhere.
> >> Let it create a new "/hbase" dir and then copy the .META. table from
> >> here up to the filesystem with data (Run add_table.rb after .META. is
> >> in place to repopulate its rows).
> >>
> >> St.Ack
> >>
> >
>
