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From Ted Yu <yuzhih...@gmail.com>
Subject problem exporting .META. table
Date Tue, 23 Nov 2010 21:04:28 GMT
Hi:
I tried to export .META. table in 0.20.6 and got:

[hadoop@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$ClientZKWatcher@44050988
10/11/23 20:59:05 INFO zookeeper.ClientCnxn: zookeeper.disableAutoWatchReset
is false
10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Attempting connection to server
us01-ciqps1-name01.carrieriq.com/10.202.50.100:2181
10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Priming connection to
java.nio.channels.SocketChannel[connected local=/10.202.50.100:31629 remote=
us01-ciqps1-name01.carrieriq.com/10.202.50.100:2181]
10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Server connection successful
10/11/23 20:59:05 DEBUG zookeeper.ZooKeeperWrapper: Read ZNode
/hbase/root-region-server got 10.202.50.112:60020
10/11/23 20:59:05 DEBUG client.HConnectionManager$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

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