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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2010/11/24 04:39:13 UTC
[jira] Commented: (HBASE-3271) Allow .META. table to be exported
[ https://issues.apache.org/jira/browse/HBASE-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935184#action_12935184 ]
Ted Yu commented on HBASE-3271:
-------------------------------
I used this code:
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;
}
The following command only exports rows in .META. which have 'packageindex' (refer to HBASE-3255):
bin/hbase org.apache.hadoop.hbase.mapreduce.Export .META. h-meta 1 0 0 packageindex
-rwxrwxrwx 1 hadoop users 90700 Nov 24 03:31 h-meta/part-m-00000
> Allow .META. table to be exported
> ---------------------------------
>
> Key: HBASE-3271
> URL: https://issues.apache.org/jira/browse/HBASE-3271
> Project: HBase
> Issue Type: Improvement
> Components: util
> Affects Versions: 0.20.6
> Reporter: Ted Yu
>
> 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.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.");
> }
> My intention was to save the dangling rows in .META. (for future investigation) which prevented a table from being created.
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