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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3271) Allow .META. table to be exported
Date Tue, 23 Nov 2010 21:58:13 GMT
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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