I plan to do this:
if (keys == null || keys.getFirst() == null ||
keys.getFirst().length == 0) {
HRegionLocation regLoc =
table.getRegionLocation(HConstants.EMPTY_BYTE_ARRAY);
if (null == regLoc)
throw new IOException("Expecting at least one region.");
List<InputSplit> splits = new ArrayList<InputSplit>(1);
InputSplit split = new TableSplit(table.getTableName(),
HConstants.EMPTY_BYTE_ARRAY, HConstants.EMPTY_BYTE_ARRAY,
regLoc.getServerAddress().getHostname());
splits.add(split);
return splits;
}
On Tue, Nov 23, 2010 at 1:57 PM, Ted Yu <yuzhih...@gmail.com> wrote:
> See:
> https://issues.apache.org/jira/browse/HBASE-3271
>
>
> On Tue, Nov 23, 2010 at 1:47 PM, Stack <st...@duboce.net> wrote:
>
>> 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:2181sessionTimeout=60000
>> >
>> watcher=org.apache.hadoop.hbase.client.hconnectionmanager$clientzkwatc...@44050988
>> > 10/11/23 20:59:05 INFO zookeeper.ClientCnxn:
>> zookeeper.disableAutoWatchReset
>> > is false
>> > 10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Attempting connection to
>> server
>> > us01-ciqps1-name01.carrieriq.com/10.202.50.100:2181
>> > 10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Priming connection to
>> > java.nio.channels.SocketChannel[connected local=/10.202.50.100:31629remote=
>> > us01-ciqps1-name01.carrieriq.com/10.202.50.100:2181]
>> > 10/11/23 20:59:05 INFO zookeeper.ClientCnxn: Server connection
>> successful
>> > 10/11/23 20:59:05 DEBUG zookeeper.ZooKeeperWrapper: Read ZNode
>> > /hbase/root-region-server got 10.202.50.112:60020
>> > 10/11/23 20:59:05 DEBUG client.HConnectionManager$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
>> >
>>
>
>
