Region的多点分割

功能简介

一般通过org.apache.hadoop.hbase.client.HBaseAdmin进行多点分割。注意：分割操作只对空Region起作用。

本例使用multiSplit进行多点分割将HBase表按照“A~D”、“D~F”、“F~H”、“H~Z”分为四个Region。

代码样例

public void testMultiSplit() {
    LOG.info("Entering testMultiSplit.");

    Table table = null;
    Admin admin = null;
    try {
      admin = conn.getAdmin();

      // initilize a HTable object
      table = conn.getTable(tableName);
      Set<HRegionInfo> regionSet = new HashSet<HRegionInfo>();
      List<HRegionLocation> regionList = conn.getRegionLocator(tableName).getAllRegionLocations();
      for(HRegionLocation hrl : regionList){
          regionSet.add(hrl.getRegionInfo());
      }
      byte[][] sk = new byte[4][];
      sk[0] = "A".getBytes();
      sk[1] = "D".getBytes();
      sk[2] = "F".getBytes();
      sk[3] = "H".getBytes();
      for (HRegionInfo regionInfo : regionSet) {
        ((HBaseAdmin)admin).multiSplit(regionInfo.getRegionName(), sk);
      }
      LOG.info("MultiSplit successfully.");
    } catch (Exception e) {
      LOG.error("MultiSplit failed.");
    } finally {
      if (table != null) {
        try {
          // Close table object
          table.close();
        } catch (IOException e) {
          LOG.error("Close table failed " ,e);
        }
      }
      if (admin != null) {
          try {
            // Close the Admin object.
            admin.close();
          } catch (IOException e) {
              LOG.error("Close admin failed " ,e);
          }
      }
    }
    LOG.info("Exiting testMultiSplit.");
  }

注意：分割操作只对空Region起作用。