I'm pretty sure the export tool presumes user-space tables, not
system-space tables. I'd doubt an export of .META. will work, at
least not without code changes.
That said, this is could be a useful facility. Want to make an issue Ted?
St.Ack
On Tue, Nov 23, 2010 at 1:04 PM, Ted Yu <yuzhih...@gmail.com> wrote:
> Hi:
> I tried to export .META. table in 0.20.6 and got:
>
> [had...@us01-ciqps1-name01 hbase]$ bin/hbase
> org.apache.hadoop.hbase.mapreduce.Export .META. h-meta 1 0 0
> 10/11/23 20:59:05 INFO jvm.JvmMetrics: Initializing JVM Metrics with
> processName=JobTracker, sessionId=
> 2010-11-23 20:59:05.255::INFO: Logging to STDERR via
> org.mortbay.log.StdErrLog
> 2010-11-23 20:59:05.255::INFO: verisons=1, starttime=0,
> endtime=9223372036854775807
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:zookeeper.version=3.2.2-888565, built on 12/08/2009 21:51 GMT
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client environment:host.name=
> us01-ciqps1-name01.carrieriq.com
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:java.version=1.6.0_21
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:java.vendor=Sun Microsystems Inc.
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:java.home=/usr/java/jdk1.6.0_21/jre
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:java.class.path=/opt/msip/clients/...
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:java.library.path=/opt/msip/clients/CIQ-Performance/m2mDeployment/hbase/lib/native/Linux-amd64-64
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:java.io.tmpdir=/tmp
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:java.compiler=<NA>
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client environment:os.name=Linux
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client environment:os.arch=amd64
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:os.version=2.6.18-194.8.1.el5
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client environment:user.name
> =hadoop
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:user.home=/home/hadoop
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Client
> environment:user.dir=/opt/msip/clients/CIQ-Performance/m2mDeployment/3.1.0.8-282685/hbase-0.20.6
> 10/11/23 20:59:05 INFO zookeeper.ZooKeeper: Initiating client connection,
> connectString=us01-ciqps1-name01.carrieriq.com:2181 sessionTimeout=60000
> watcher=org.apache.hadoop.hbase.client.hconnectionmanager$clientzkwatc...@44050988
> 10/11/23 20:59:05 INFO zookeeper.ClientCnxn: zookeeper.disableAutoWatchReset
> is false
> 10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Attempting connection to server
> us01-ciqps1-name01.carrieriq.com/10.202.50.100:2181
> 10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Priming connection to
> java.nio.channels.SocketChannel[connected local=/10.202.50.100:31629 remote=
> us01-ciqps1-name01.carrieriq.com/10.202.50.100:2181]
> 10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Server connection successful
> 10/11/23 20:59:05 DEBUG zookeeper.ZooKeeperWrapper: Read ZNode
> /hbase/root-region-server got 10.202.50.112:60020
> 10/11/23 20:59:05 DEBUG client.HConnectionManager$TableServers: Found ROOT
> at 10.202.50.112:60020
> 10/11/23 20:59:05 DEBUG client.HConnectionManager$TableServers: Cached
> location for .META.,,1 is us01-ciqps1-grid02.carrieriq.com:60020
> Exception in thread "main" java.io.IOException: Expecting at least one
> region.
> at
> org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.getSplits(TableInputFormatBase.java:281)
> at
> org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:885)
> at
> org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:779)
> at org.apache.hadoop.mapreduce.Job.submit(Job.java:432)
> at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:447)
> at org.apache.hadoop.hbase.mapreduce.Export.main(Export.java:146)
>
> Related code is:
> if (keys == null || keys.getFirst() == null ||
> keys.getFirst().length == 0) {
> throw new IOException("Expecting at least one region.");
> }
>
> Has anyone done similar thing ?
>
> Thanks
>
