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

   * @throws TableNotFoundException if table does not yet exist
   */
  public void doBulkLoad(Path hfofDir, final HTable table)
    throws TableNotFoundException, IOException
  {
    final 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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   * @throws InterruptedException 
   * @throws KeeperException 
   */
  @Test public void testThatIfMETAMovesWeAreNotified()
  throws IOException, InterruptedException, KeeperException {
    HConnection connection = Mockito.mock(HConnection.class);
    constructAndStartCatalogTracker(connection);


    RootLocationEditor.setRootLocation(this.watcher,
      new ServerName("example.com", 1234, System.currentTimeMillis()));
  }

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   * @throws InterruptedException
   */
  @Test public void testInterruptWaitOnMetaAndRoot()
  throws IOException, InterruptedException {
    HRegionInterface implementation = Mockito.mock(HRegionInterface.class);
    HConnection connection = mockConnection(implementation);


    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);


    // 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);


    // 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);
    RootLocationEditor.setRootLocation(this.watcher,
      new ServerName("example.com", 1234, System.currentTimeMillis()));

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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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  }


  @Test (expected = RetriesExhaustedException.class)
  public void testTimeoutWaitForMeta()
  throws IOException, InterruptedException {
    HConnection connection =
      HConnectionTestingUtility.getMockedConnection(UTIL.getConfiguration());
    final CatalogTracker ct = constructAndStartCatalogTracker(connection);
    ct.waitForMeta(100);
  }

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   * @throws InterruptedException
   * @throws KeeperException
   */
  @Test public void testNoTimeoutWaitForRoot()
  throws IOException, InterruptedException, KeeperException {
    HConnection connection = Mockito.mock(HConnection.class);
    final CatalogTracker ct = constructAndStartCatalogTracker(connection);
    ServerName hsa = ct.getRootLocation();
    Assert.assertNull(hsa);


    // Now test waiting on root location getting set.

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    // Mock an HConnection and a HRegionInterface implementation.  Have the
    // HConnection return the HRI.  Have the HRI return a few mocked up responses
    // to make our test work.
    // Mock an HRegionInterface.
    final HRegionInterface implementation = Mockito.mock(HRegionInterface.class);
    HConnection connection = mockConnection(implementation);


    // Now the ct is up... set into the mocks some answers that make it look
    // like things have been getting assigned. Make it so we'll return a
    // location (no matter what the Get is). Same for getHRegionInfo -- always
    // just return the meta region.
    final Result result = getMetaTableRowResult();


    // 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(result);
    Mockito.when(implementation.getRegionInfo((byte[]) Mockito.any())).
      thenReturn(HRegionInfo.FIRST_META_REGIONINFO);
    final CatalogTracker ct = constructAndStartCatalogTracker(connection);
    ServerName hsa = ct.getMetaLocation();

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