Java HTable.getRegionLocations方法代碼示例

import org.apache.hadoop.hbase.client.HTable; //導入方法依賴的package包/類
/**
 * Create a table with specified table name and region number.
 * @param tablename
 * @param regionNum
 * @return
 * @throws IOException
 */
private static void createTable(TableName tableName, int regionNum)
    throws IOException {
  int expectedRegions = regionNum;
  byte[][] splitKeys = new byte[expectedRegions - 1][];
  for (int i = 1; i < expectedRegions; i++) {
    byte splitKey = (byte) i;
    splitKeys[i - 1] = new byte[] { splitKey, splitKey, splitKey };
  }

  HTableDescriptor desc = new HTableDescriptor(tableName);
  desc.addFamily(new HColumnDescriptor(HConstants.CATALOG_FAMILY));
  admin.createTable(desc, splitKeys);

  HTable ht = (HTable) CONNECTION.getTable(tableName);
  @SuppressWarnings("deprecation")
  Map<HRegionInfo, ServerName> regions = ht.getRegionLocations();
  assertEquals("Tried to create " + expectedRegions + " regions "
      + "but only found " + regions.size(), expectedRegions, regions.size());
  ht.close();
}
 

import org.apache.hadoop.hbase.client.HTable; //導入方法依賴的package包/類
private void verifyBounds(List<byte[]> expectedBounds, TableName tableName)
        throws Exception {
    // Get region boundaries from the cluster and verify their endpoints
    final Configuration conf = UTIL.getConfiguration();
    final int numRegions = expectedBounds.size()-1;
    final HTable hTable = new HTable(conf, tableName);
    final Map<HRegionInfo, ServerName> regionInfoMap = hTable.getRegionLocations();
    assertEquals(numRegions, regionInfoMap.size());
    for (Map.Entry<HRegionInfo, ServerName> entry: regionInfoMap.entrySet()) {
        final HRegionInfo regionInfo = entry.getKey();
        byte[] regionStart = regionInfo.getStartKey();
        byte[] regionEnd = regionInfo.getEndKey();

        // This region's start key should be one of the region boundaries
        int startBoundaryIndex = indexOfBytes(expectedBounds, regionStart);
        assertNotSame(-1, startBoundaryIndex);

        // This region's end key should be the region boundary that comes
        // after the starting boundary.
        byte[] expectedRegionEnd = expectedBounds.get(
                startBoundaryIndex+1);
        assertEquals(0, Bytes.compareTo(regionEnd, expectedRegionEnd));
    }
    hTable.close();
}
 

import org.apache.hadoop.hbase.client.HTable; //導入方法依賴的package包/類
private void init() {
  logger.debug("Getting region locations");
  try {
    HTable table = new HTable(storagePluginConfig.getHBaseConf(), hbaseScanSpec.getTableName());
    this.hTableDesc = table.getTableDescriptor();
    NavigableMap<HRegionInfo, ServerName> regionsMap = table.getRegionLocations();
    statsCalculator = new TableStatsCalculator(table, hbaseScanSpec, storagePlugin.getContext().getConfig(), storagePluginConfig);

    boolean foundStartRegion = false;
    regionsToScan = new TreeMap<HRegionInfo, ServerName>();
    for (Entry<HRegionInfo, ServerName> mapEntry : regionsMap.entrySet()) {
      HRegionInfo regionInfo = mapEntry.getKey();
      if (!foundStartRegion && hbaseScanSpec.getStartRow() != null && hbaseScanSpec.getStartRow().length != 0 && !regionInfo.containsRow(hbaseScanSpec.getStartRow())) {
        continue;
      }
      foundStartRegion = true;
      regionsToScan.put(regionInfo, mapEntry.getValue());
      scanSizeInBytes += statsCalculator.getRegionSizeInBytes(regionInfo.getRegionName());
      if (hbaseScanSpec.getStopRow() != null && hbaseScanSpec.getStopRow().length != 0 && regionInfo.containsRow(hbaseScanSpec.getStopRow())) {
        break;
      }
    }

    table.close();
  } catch (IOException e) {
    throw new DrillRuntimeException("Error getting region info for table: " + hbaseScanSpec.getTableName(), e);
  }
  verifyColumns();
}
 

import org.apache.hadoop.hbase.client.HTable; //導入方法依賴的package包/類
private void assertAllOnLine(final HTable t) throws IOException {
  NavigableMap<HRegionInfo, ServerName> regions = t.getRegionLocations();
  for (Map.Entry<HRegionInfo, ServerName> e: regions.entrySet()) {
    byte [] startkey = e.getKey().getStartKey();
    Scan s = new Scan(startkey);
    ResultScanner scanner = t.getScanner(s);
    Result r = scanner.next();
    org.junit.Assert.assertTrue(r != null && r.size() > 0);
    scanner.close();
  }
}