Examples of org.apache.hadoop.hbase.client.HConnection

org.apache.hadoop.hbase.client.HConnection
A cluster connection. Knows how to find the master, locate regions out on the cluster, keeps a cache of locations and then knows how to re-calibrate after they move. {@link HConnectionManager} manages instances of this class. This is NOT a connection to aparticular server but to all servers in the cluster. Individual connections are managed at a lower level.
HConnections are used by {@link HTable} mostly but also by{@link HBaseAdmin}, and {@link CatalogTracker}. HConnection instances can be shared. Sharing is usually what you want because rather than each HConnection instance having to do its own discovery of regions out on the cluster, instead, all clients get to share the one cache of locations. {@link HConnectionManager} does thesharing for you if you go by it getting connections. Sharing makes cleanup of HConnections awkward. See {@link HConnectionManager} for cleanup discussion. @see HConnectionManager

    ZooKeeperWatcher zkw = new ZooKeeperWatcher(UTIL.getConfiguration(),
      this.getClass().getSimpleName(), ABORTABLE, true);
    // This is a servername we use in a few places below.
    ServerName sn = new ServerName("example.com", 1234, System.currentTimeMillis());


    HConnection connection = null;
    CatalogTracker ct = null;
    try {
      // Mock an HRegionInterface. Our mock implementation will fail a few
      // times when we go to open a scanner.
      final HRegionInterface implementation = Mockito.mock(HRegionInterface.class);

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    throw new IOException("did timeout waiting for service to stop:" + serverName);
  }


  @Override
  public HMasterInterface getMasterAdmin() throws IOException {
    HConnection conn = HConnectionManager.getConnection(conf);
    return conn.getMaster();
  }

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    return false;
  }


  @Override
  public ServerName getServerHoldingRegion(byte[] regionName) throws IOException {
    HConnection connection = admin.getConnection();
    HRegionLocation regionLoc = connection.locateRegion(regionName);
    if (regionLoc == null) {
      return null;
    }


    org.apache.hadoop.hbase.HServerInfo sn
    = connection.getHRegionConnection(regionLoc.getHostname(), regionLoc.getPort()).getHServerInfo();


    return new ServerName(sn.getServerAddress().getHostname(), sn.getServerAddress().getPort(), sn.getStartCode());
  }

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    ht.close();
    HRegionServer server = TEST_UTIL.getHBaseCluster().getRegionServer(0);
    byte []firstRow = Bytes.toBytes("aaa");
    byte []splitRow = Bytes.toBytes("lll");
    byte []lastRow = Bytes.toBytes("zzz");
    HConnection con = HConnectionManager
        .getConnection(TEST_UTIL.getConfiguration());
    // this will also cache the region
    byte[] regionName = con.locateRegion(tableName, splitRow).getRegionInfo()
        .getRegionName();
    HRegion region = server.getRegion(regionName);
    SplitTransaction split = new SplitTransaction(region, splitRow);
    split.prepare();

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      LOG.info("createMultiRegions: deleting meta row -> " +
        Bytes.toStringBinary(row));
      meta.delete(new Delete(row));
    }
    // flush cache of regions
    HConnection conn = table.getConnection();
    conn.clearRegionCache();
    return count;
  }

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   * @throws TableNotFoundException if table does not yet exist
   */
  public void doBulkLoad(Path hfofDir, HTable table)
    throws TableNotFoundException, IOException
  {
    HConnection conn = table.getConnection();
    
    if (!conn.isTableAvailable(table.getTableName())) {
      throw new TableNotFoundException("Table " + 
          Bytes.toStringBinary(table.getTableName()) +
          "is not currently available.");
    }

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    new HTable(conf, HConstants.META_TABLE_NAME);


    ZooKeeperWrapper zkw = new ZooKeeperWrapper(conf, EmptyWatcher.instance);
    String quorumServers = zkw.getQuorumServers();
    int sessionTimeout = 5 * 1000; // 5 seconds
    HConnection connection = HConnectionManager.getConnection(conf);
    ZooKeeperWrapper connectionZK = connection.getZooKeeperWrapper();
    long sessionID = connectionZK.getSessionID();
    byte[] password = connectionZK.getSessionPassword();


    ZooKeeper zk = new ZooKeeper(quorumServers, sessionTimeout,
        EmptyWatcher.instance, sessionID, password);
    zk.close();


    Thread.sleep(sessionTimeout * 3L);


    System.err.println("ZooKeeper should have timed out");
    connection.relocateRegion(HConstants.ROOT_TABLE_NAME, HConstants.EMPTY_BYTE_ARRAY);
  }

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   * @throws IOException
   */
  public static void merge(HBaseConfiguration conf, FileSystem fs,
    final byte [] tableName)
  throws IOException {
    HConnection connection = HConnectionManager.getConnection(conf);
    boolean masterIsRunning = connection.isMasterRunning();
    HConnectionManager.deleteConnectionInfo(conf);
    if (Bytes.equals(tableName, META_TABLE_NAME)) {
      if (masterIsRunning) {
        throw new IllegalStateException(
            "Can not compact META table if instance is on-line");

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    throws IOException {
    ClusterStatus status = admin.getMaster().getClusterStatus();
    Collection<ServerName> regionServers = status.getServers();
    Map<ServerName, List<String>> mm =
        new HashMap<ServerName, List<String>>();
    HConnection connection = admin.getConnection();
    for (ServerName hsi : regionServers) {
      HRegionInterface server =
        connection.getHRegionConnection(hsi.getHostname(), hsi.getPort());


      // list all online regions from this region server
      List<HRegionInfo> regions = server.getOnlineRegions();
      List<String> regionNames = new ArrayList<String>();
      for (HRegionInfo hri : regions) {

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    ZooKeeperWatcher zkw = new ZooKeeperWatcher(UTIL.getConfiguration(),
      this.getClass().getSimpleName(), ABORTABLE, true);
    // This is a servername we use in a few places below.
    ServerName sn = new ServerName("example.com", 1234, System.currentTimeMillis());


    HConnection connection = null;
    CatalogTracker ct = null;
    try {
      // Mock an HRegionInterface. Our mock implementation will fail a few
      // times when we go to open a scanner.
      final HRegionInterface implementation = Mockito.mock(HRegionInterface.class);

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