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From Stack <st...@duboce.net>
Subject Re: lost .META. table
Date Tue, 21 Sep 2010 23:17:26 GMT
Please put the first 1k lines after startup up in pastebin.  The below
is hard to read.  Its scanning the -ROOT- but there is no mention of
.META. being assigned out.

St.Ack

On Tue, Sep 21, 2010 at 3:09 PM, Matt Corgan <mcorgan@hotpads.com> wrote:
> 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$ClientZKWatcher@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 <stack@duboce.net> 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 <mcorgan@hotpads.com> 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
>> >
>> > [root@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?
>> >
>> > [root@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 <stack@duboce.net> wrote:
>> >
>> >> On Tue, Sep 21, 2010 at 1:07 PM, Matt Corgan <mcorgan@hotpads.com>
>> 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
>> >>
>> >
>>
>

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