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

org.apache.hadoop.hbase.client.Table
Used to communicate with a single HBase table. Obtain an instance from an {@link HConnection}. @since 0.99.0

    }


    @Override
    public void prePut(final ObserverContext<RegionCoprocessorEnvironment> e, final Put put,
        final WALEdit edit, final Durability durability) throws IOException {
      Table table = e.getEnvironment().getTable(otherTable, getPool());
      Put p = new Put(new byte[] { 'a' });
      p.add(family, null, new byte[] { 'a' });
      try {
        table.batch(Collections.singletonList(put));
      } catch (InterruptedException e1) {
        throw new IOException(e1);
      }
      completedWithPool[0] = true;
      table.close();
    }

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    HColumnDescriptor hcd = htd.getFamilies().iterator().next();
    // Create the test table
    TEST_UTIL.getHBaseAdmin().createTable(htd);
    TEST_UTIL.waitTableAvailable(htd.getName(), 5000);
    // Create a store file
    Table table = new HTable(conf, htd.getName());
    try {
      table.put(new Put(Bytes.toBytes("testrow"))
        .add(hcd.getName(), Bytes.toBytes("q"), Bytes.toBytes("value")));
    } finally {
      table.close();
    }
    TEST_UTIL.getHBaseAdmin().flush(htd.getTableName());
  }

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    // When the hbase:meta table can be opened, the region servers are running
    new HTable(TEST_UTIL.getConfiguration(), TableName.META_TABLE_NAME);
    this.server = cluster.getRegionServerThreads().get(0).getRegionServer();
    this.log = server.getWAL();


    Table table = createTestTable(this.tableName);


    server = TEST_UTIL.getRSForFirstRegionInTable(Bytes.toBytes(tableName));
    this.log = server.getWAL();
    for (int i = 1; i <= 256; i++) {    // 256 writes should cause 8 log rolls
      doPut(table, i);

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    String tableName = getName();
    HTableDescriptor desc = new HTableDescriptor(TableName.valueOf(tableName));
    desc.addFamily(new HColumnDescriptor(HConstants.CATALOG_FAMILY));


    admin.createTable(desc);
    Table table = new HTable(TEST_UTIL.getConfiguration(), tableName);
    assertTrue(table.isAutoFlush());


    server = TEST_UTIL.getRSForFirstRegionInTable(Bytes.toBytes(tableName));
    this.log = server.getWAL();


    assertTrue("Need HDFS-826 for this test", ((FSHLog) log).canGetCurReplicas());

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  @Test
  public void testCheckAndDeleteHooks() throws IOException {
    TableName tableName =
        TableName.valueOf(TEST_TABLE.getNameAsString() + ".testCheckAndDeleteHooks");
    Table table = util.createTable(tableName, new byte[][] {A, B, C});
    try {
      Put p = new Put(Bytes.toBytes(0));
      p.add(A, A, A);
      table.put(p);
      table.flushCommits();
      Delete d = new Delete(Bytes.toBytes(0));
      table.delete(d);
      verifyMethodResult(SimpleRegionObserver.class,
          new String[] {"hadPreCheckAndDelete",
              "hadPreCheckAndDeleteAfterRowLock", "hadPostCheckAndDelete"},
          tableName,
          new Boolean[] {false, false, false}
          );
      table.checkAndDelete(Bytes.toBytes(0), A, A, A, d);
      verifyMethodResult(SimpleRegionObserver.class,
          new String[] {"hadPreCheckAndDelete",
              "hadPreCheckAndDeleteAfterRowLock", "hadPostCheckAndDelete"},
          tableName,
          new Boolean[] {true, true, true}
          );
    } finally {
      util.deleteTable(tableName);
      table.close();
    }
  }

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  }


  @Test
  public void testAppendHook() throws IOException {
    TableName tableName = TableName.valueOf(TEST_TABLE.getNameAsString() + ".testAppendHook");
    Table table = util.createTable(tableName, new byte[][] {A, B, C});
    try {
      Append app = new Append(Bytes.toBytes(0));
      app.add(A, A, A);


      verifyMethodResult(SimpleRegionObserver.class,
          new String[] {"hadPreAppend", "hadPostAppend", "hadPreAppendAfterRowLock"},
          tableName,
          new Boolean[] {false, false, false}
          );


      table.append(app);


      verifyMethodResult(SimpleRegionObserver.class,
          new String[] {"hadPreAppend", "hadPostAppend", "hadPreAppendAfterRowLock"},
          tableName,
          new Boolean[] {true, true, true}
          );
    } finally {
      util.deleteTable(tableName);
      table.close();
    }
  }

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            "wasScannerCloseCalled"},
        tableName,
        new Boolean[] {false, false, false, false}
    );


    Table table = new HTable(util.getConfiguration(), tableName);
    Put put = new Put(ROW);
    put.add(A, A, A);
    table.put(put);


    Get get = new Get(ROW);
    get.addColumn(A, A);
    table.get(get);


    // verify that scannerNext and scannerClose upcalls won't be invoked
    // when we perform get().
    verifyMethodResult(SimpleRegionObserver.class,
        new String[] {"hadPreGet", "hadPostGet", "wasScannerNextCalled",
            "wasScannerCloseCalled"},
        tableName,
        new Boolean[] {true, true, false, false}
    );


    Scan s = new Scan();
    ResultScanner scanner = table.getScanner(s);
    try {
      for (Result rr = scanner.next(); rr != null; rr = scanner.next()) {
      }
    } finally {
      scanner.close();
    }


    // now scanner hooks should be invoked.
    verifyMethodResult(SimpleRegionObserver.class,
        new String[] {"wasScannerNextCalled", "wasScannerCloseCalled"},
        tableName,
        new Boolean[] {true, true}
    );
    util.deleteTable(tableName);
    table.close();
  }

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        new String[] {"hadDeleted", "wasScannerOpenCalled"},
        tableName,
        new Boolean[] {false, false}
    );


    Table table = new HTable(util.getConfiguration(), tableName);
    Put put = new Put(ROW);
    put.add(A, A, A);
    table.put(put);


    Delete delete = new Delete(ROW);
    table.delete(delete);


    verifyMethodResult(SimpleRegionObserver.class,
        new String[] {"hadDeleted", "wasScannerOpenCalled"},
        tableName,
        new Boolean[] {true, false}
    );


    Scan s = new Scan();
    ResultScanner scanner = table.getScanner(s);
    try {
      for (Result rr = scanner.next(); rr != null; rr = scanner.next()) {
      }
    } finally {
      scanner.close();
    }


    // now scanner hooks should be invoked.
    verifyMethodResult(SimpleRegionObserver.class,
        new String[] {"wasScannerOpenCalled"},
        tableName,
        new Boolean[] {true}
    );
    util.deleteTable(tableName);
    table.close();
  }

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    HTableDescriptor htd = new HTableDescriptor(compactTable);
    htd.addFamily(new HColumnDescriptor(A));
    htd.addCoprocessor(EvenOnlyCompactor.class.getName());
    admin.createTable(htd);


    Table table = new HTable(util.getConfiguration(), compactTable);
    for (long i=1; i<=10; i++) {
      byte[] iBytes = Bytes.toBytes(i);
      Put put = new Put(iBytes);
      put.setDurability(Durability.SKIP_WAL);
      put.add(A, A, iBytes);
      table.put(put);
    }


    HRegion firstRegion = cluster.getRegions(compactTable).get(0);
    Coprocessor cp = firstRegion.getCoprocessorHost().findCoprocessor(
        EvenOnlyCompactor.class.getName());
    assertNotNull("EvenOnlyCompactor coprocessor should be loaded", cp);
    EvenOnlyCompactor compactor = (EvenOnlyCompactor)cp;


    // force a compaction
    long ts = System.currentTimeMillis();
    admin.flush(compactTable);
    // wait for flush
    for (int i=0; i<10; i++) {
      if (compactor.lastFlush >= ts) {
        break;
      }
      Thread.sleep(1000);
    }
    assertTrue("Flush didn't complete", compactor.lastFlush >= ts);
    LOG.debug("Flush complete");


    ts = compactor.lastFlush;
    admin.majorCompact(compactTable);
    // wait for compaction
    for (int i=0; i<30; i++) {
      if (compactor.lastCompaction >= ts) {
        break;
      }
      Thread.sleep(1000);
    }
    LOG.debug("Last compaction was at "+compactor.lastCompaction);
    assertTrue("Compaction didn't complete", compactor.lastCompaction >= ts);


    // only even rows should remain
    ResultScanner scanner = table.getScanner(new Scan());
    try {
      for (long i=2; i<=10; i+=2) {
        Result r = scanner.next();
        assertNotNull(r);
        assertFalse(r.isEmpty());
        byte[] iBytes = Bytes.toBytes(i);
        assertArrayEquals("Row should be "+i, r.getRow(), iBytes);
        assertArrayEquals("Value should be "+i, r.getValue(A, A), iBytes);
      }
    } finally {
      scanner.close();
    }
    table.close();
  }

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      listener.awaitModifications(1);
      assertEquals(1, listener.getLoadCount());
      assertEquals(0, listener.getCloseCount());


      // Add some data
      Table table = new HTable(TEST_UTIL.getConfiguration(), TABLE_NAME);
      try {
        for (int i = 0; i < 10; ++i) {
          byte[] key = Bytes.toBytes("row-" + i);
          Put put = new Put(key);
          put.add(FAMILY, null, key);
          table.put(put);
        }
      } finally {
        table.close();
      }


      // Split the table in two
      LOG.info("Split Table");
      listener.reset();

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