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  1. HBase
  2. HBASE-3271

Allow .META. table to be exported

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.20.6
    • Fix Version/s: 0.94.2
    • Component/s: util
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      mapreduce.Export is able to export .META. table

      Description

      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.

        Attachments

        1. 3271.94
          3 kB
          Ted Yu
        2. HBASE-3271.patch
          4 kB
          Liang Xie
        3. HBASE-3271-v2.patch
          4 kB
          Liang Xie

          Activity

            People

            • Assignee:
              xieliang007 Liang Xie
              Reporter:
              yuzhihong@gmail.com Ted Yu
            • Votes:
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              Watchers:
              6 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: