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

          + System.getProperty("file.separator") + htd.getNameAsString()
          + System.getProperty("file.separator") + regionToDeleteInFS);
      getDFSCluster().getFileSystem().delete(tableDir);
    }
    // flush cache of regions
    HConnection conn = table.getConnection();
    conn.clearRegionCache();
    // assign all the new regions IF table is enabled.
    HBaseAdmin admin = getHBaseAdmin();
    if (admin.isTableEnabled(table.getTableName())) {
      for(HRegionInfo hri : newRegions) {
        admin.assign(hri.getRegionName());

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    // Return a good result first and then return null to indicate end of scan
    Mockito.when(implementation.next(Mockito.anyLong(), Mockito.anyInt())).
      thenReturn(new Result [] {r}, (Result [])null);


    // Get a connection w/ mocked up common methods.
    HConnection connection =
      HConnectionTestingUtility.getMockedConnectionAndDecorate(HTU.getConfiguration(),
        implementation, SERVERNAME_B, REGIONINFO);


    // Make it so we can get a catalogtracker from servermanager.. .needed
    // down in guts of server shutdown handler.

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      Mockito.when(ri.next(Mockito.anyLong(), Mockito.anyInt())).thenReturn(new Result[] { r });
      // If a get, return the above result too for REGIONINFO
      Mockito.when(ri.get((byte[]) Mockito.any(), (Get) Mockito.any())).thenReturn(r);
    }
    // Get a connection w/ mocked up common methods.
    HConnection connection = HConnectionTestingUtility.
      getMockedConnectionAndDecorate(HTU.getConfiguration(), ri, SERVERNAME_B,
        REGIONINFO);
    // Make it so we can get the connection from our mocked catalogtracker
    Mockito.when(ct.getConnection()).thenReturn(connection);
    // Create and startup an executor. Used by AM handling zk callbacks.

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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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   * @throws InterruptedException 
   * @throws KeeperException 
   */
  @Test public void testThatIfMETAMovesWeAreNotified()
  throws IOException, InterruptedException, KeeperException {
    HConnection connection = Mockito.mock(HConnection.class);
    constructAndStartCatalogTracker(connection);
    try {
      RootLocationEditor.setRootLocation(this.watcher,
        new ServerName("example.com", 1234, System.currentTimeMillis()));
    } finally {

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   * @throws InterruptedException
   */
  @Test public void testInterruptWaitOnMetaAndRoot()
  throws IOException, InterruptedException {
    HRegionInterface implementation = Mockito.mock(HRegionInterface.class);
    HConnection connection = mockConnection(implementation);
    try {
      final CatalogTracker ct = constructAndStartCatalogTracker(connection);
      ServerName hsa = ct.getRootLocation();
      Assert.assertNull(hsa);
      ServerName meta = ct.getMetaLocation();

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  @Test
  public void testServerNotRunningIOException()
  throws IOException, InterruptedException, KeeperException {
    // Mock an HRegionInterface.
    final HRegionInterface implementation = Mockito.mock(HRegionInterface.class);
    HConnection connection = mockConnection(implementation);
    try {
      // If a 'getRegionInfo' is called on mocked HRegionInterface, throw IOE
      // the first time.  'Succeed' the second time we are called.
      Mockito.when(implementation.getRegionInfo((byte[]) Mockito.any())).
        thenThrow(new IOException("Server not running, aborting")).
        thenReturn(new HRegionInfo());


      // After we encounter the above 'Server not running', we should catch the
      // IOE and go into retrying for the meta mode.  We'll do gets on -ROOT- to
      // get new meta location.  Return something so this 'get' succeeds
      // (here we mock up getRegionServerWithRetries, the wrapper around
      // the actual get).


      // TODO: Refactor.  This method has been moved out of HConnection.
      // It works for now but has been deprecated.
      Mockito.when(connection.getRegionServerWithRetries((ServerCallable<Result>)Mockito.any())).
        thenReturn(getMetaTableRowResult());


      // Now start up the catalogtracker with our doctored Connection.
      final CatalogTracker ct = constructAndStartCatalogTracker(connection);
      try {

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  private void testVerifyMetaRegionLocationWithException(Exception ex)
  throws IOException, InterruptedException, KeeperException {
    // Mock an HRegionInterface.
    final HRegionInterface implementation = Mockito.mock(HRegionInterface.class);
    HConnection connection = mockConnection(implementation);
    try {
      // If a 'get' is called on mocked interface, throw connection refused.
      Mockito.when(implementation.get((byte[]) Mockito.any(), (Get) Mockito.any())).
        thenThrow(ex);
      // Now start up the catalogtracker with our doctored Connection.

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   * @throws KeeperException
   */
  @Test
  public void testVerifyRootRegionLocationFails()
  throws IOException, InterruptedException, KeeperException {
    HConnection connection = Mockito.mock(HConnection.class);
    ConnectException connectException =
      new ConnectException("Connection refused");
    final HRegionInterface implementation =
      Mockito.mock(HRegionInterface.class);
    Mockito.when(implementation.getRegionInfo((byte [])Mockito.any())).
      thenThrow(connectException);
    Mockito.when(connection.getHRegionConnection(Mockito.anyString(),
      Mockito.anyInt(), Mockito.anyBoolean())).
      thenReturn(implementation);
    final CatalogTracker ct = constructAndStartCatalogTracker(connection);
    try {
      RootLocationEditor.setRootLocation(this.watcher,

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  }


  @Test (expected = NotAllMetaRegionsOnlineException.class)
  public void testTimeoutWaitForRoot()
  throws IOException, InterruptedException {
    HConnection connection = Mockito.mock(HConnection.class);
    final CatalogTracker ct = constructAndStartCatalogTracker(connection);
    ct.waitForRoot(100);
  }

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