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

org.apache.hadoop.hbase.client.ResultScanner
Interface for client-side scanning. Go to {@link HTable} to obtain instances.

            .getAssignmentManager().getRegionStates()
            .getRegionsOfTable(userTableName);
      }
      Assert.assertEquals(2, regionsOfTable.size());
      Scan s = new Scan();
      ResultScanner scanner = table.getScanner(s);
      int mainTableCount = 0;
      for (Result rr = scanner.next(); rr != null; rr = scanner.next()) {
        mainTableCount++;
      }
      Assert.assertEquals(3, mainTableCount);
    } finally {
      table.close();

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   */
  private int getKeyValueCount(HTable table) throws IOException {
    Scan scan = new Scan();
    scan.setMaxVersions(Integer.MAX_VALUE - 1);


    ResultScanner results = table.getScanner(scan);
    int count = 0;
    for (Result res : results) {
      count += res.listCells().size();
      System.out.println(count + ") " + res);
    }
    results.close();


    return count;
  }

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    // point to a different region server
    HTable meta = new HTable(conf, HTableDescriptor.META_TABLEDESC.getTableName(),
        executorService);
    Scan scan = new Scan();
    scan.setStartRow(Bytes.toBytes(table+",,"));
    ResultScanner scanner = meta.getScanner(scan);
    HRegionInfo hri = null;


    Result res = scanner.next();
    ServerName currServer =
      ServerName.parseFrom(res.getValue(HConstants.CATALOG_FAMILY,
          HConstants.SERVER_QUALIFIER));
    long startCode = Bytes.toLong(res.getValue(HConstants.CATALOG_FAMILY,
        HConstants.STARTCODE_QUALIFIER));


    for (JVMClusterUtil.RegionServerThread rs :
        TEST_UTIL.getHBaseCluster().getRegionServerThreads()) {


      ServerName sn = rs.getRegionServer().getServerName();


      // When we find a diff RS, change the assignment and break
      if (!currServer.getHostAndPort().equals(sn.getHostAndPort()) ||
          startCode != sn.getStartcode()) {
        Put put = new Put(res.getRow());
        put.setDurability(Durability.SKIP_WAL);
        put.add(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER,
          Bytes.toBytes(sn.getHostAndPort()));
        put.add(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER,
          Bytes.toBytes(sn.getStartcode()));
        meta.put(put);
        hri = HRegionInfo.getHRegionInfo(res);
        break;
      }
    }


    // Try to fix the data
    assertErrors(doFsck(conf, true), new ERROR_CODE[]{
        ERROR_CODE.SERVER_DOES_NOT_MATCH_META});


    TEST_UTIL.getHBaseCluster().getMaster()
      .getAssignmentManager().waitForAssignment(hri);


    // Should be fixed now
    assertNoErrors(doFsck(conf, false));


    // comment needed - what is the purpose of this line
    HTable t = new HTable(conf, Bytes.toBytes(table), executorService);
    ResultScanner s = t.getScanner(new Scan());
    s.close();
    t.close();


    scanner.close();
    meta.close();
  }

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  /**
   * Counts the number of row to verify data loss or non-dataloss.
   */
  int countRows() throws IOException {
     Scan s = new Scan();
     ResultScanner rs = tbl.getScanner(s);
     int i = 0;
     while(rs.next() !=null) {
       i++;
     }
     return i;
  }

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    }
    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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        Scan s = new Scan();
        s.addFamily(TEST_FAMILY);


        HTable table = new HTable(conf, TEST_TABLE.getTableName());
        try {
          ResultScanner scanner = table.getScanner(s);
          try {
            for (Result r = scanner.next(); r != null; r = scanner.next()) {
              // do nothing
            }
          } catch (IOException e) {
          } finally {
            scanner.close();
          }
        } finally {
          table.close();
        }
        return null;

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        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"},

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        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"},

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    Configuration c = new Configuration(this.conf);
    this.hbaseCluster =
        new MiniHBaseCluster(c, numMasters, numSlaves, masterClass, regionserverClass);
    // Don't leave here till we've done a successful scan of the hbase:meta
    HTable t = new HTable(c, TableName.META_TABLE_NAME);
    ResultScanner s = t.getScanner(new Scan());
    while (s.next() != null) {
      continue;
    }
    s.close();
    t.close();


    getHBaseAdmin(); // create immediately the hbaseAdmin
    LOG.info("Minicluster is up");
    return (MiniHBaseCluster)this.hbaseCluster;

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   */
  public void restartHBaseCluster(int servers) throws IOException, InterruptedException {
    this.hbaseCluster = new MiniHBaseCluster(this.conf, servers);
    // Don't leave here till we've done a successful scan of the hbase:meta
    HTable t = new HTable(new Configuration(this.conf), TableName.META_TABLE_NAME);
    ResultScanner s = t.getScanner(new Scan());
    while (s.next() != null) {
      // do nothing
    }
    LOG.info("HBase has been restarted");
    s.close();
    t.close();
  }

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