Examples of org.apache.accumulo.core.client.Connector.createScanner()

Class org.apache.accumulo.core.client.Connector

Examples of org.apache.accumulo.core.client.Connector.createScanner()

org.apache.accumulo.core.client.Connector.createScanner()
Factory method to create a Scanner connected to Accumulo. @param tableName the name of the table to query data from @param authorizations A set of authorization labels that will be checked against the column visibility of each key in order to filter data. The authorizations passed in must be a subset of the accumulo user's set of authorizations. If the accumulo user has authorizations (A1, A2) and authorizations (A2, A3) are passed, then an exception will be thrown. @return Scanner object for configuring and querying data with @throws TableNotFoundException when the specified table doesn't exist

      throw new ThriftTableOperationException(tableId, null, TableOperation.COMPACT, TableOperationExceptionType.OTHER, "Compaction canceled");
    }


    MapCounter<TServerInstance> serversToFlush = new MapCounter<TServerInstance>();
    Connector conn = master.getConnector();
    Scanner scanner = new IsolatedScanner(conn.createScanner(Constants.METADATA_TABLE_NAME, Constants.NO_AUTHS));
    
    Range range = new KeyExtent(new Text(tableId), null, startRow == null ? null : new Text(startRow)).toMetadataRange();
    
    if (tableId.equals(Constants.METADATA_TABLE_ID))
      range = range.clip(new Range(Constants.ROOT_TABLET_EXTENT.getMetadataEntry(), false, null, true));

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        serversToFlush.clear();
        
        try {
          Connector conn = getConnector();
          Scanner scanner = new IsolatedScanner(conn.createScanner(Constants.METADATA_TABLE_NAME, Constants.NO_AUTHS));
          Constants.METADATA_FLUSH_COLUMN.fetch(scanner);
          Constants.METADATA_DIRECTORY_COLUMN.fetch(scanner);
          scanner.fetchColumnFamily(Constants.METADATA_CURRENT_LOCATION_COLUMN_FAMILY);
          scanner.fetchColumnFamily(Constants.METADATA_LOG_COLUMN_FAMILY);
          scanner.setRange(new KeyExtent(new Text(tableId), null, ByteBufferUtil.toText(startRow)).toMetadataRange());

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      reader.initialize(split, context);
      mapper.run(context);
      writer.close(context);
    }


    Scanner scanner = c.createScanner("testtable2", new Authorizations());
    Iterator<Entry<Key,Value>> iter = scanner.iterator();
    assertTrue(iter.hasNext());
    Entry<Key,Value> entry = iter.next();
    assertEquals(Integer.parseInt(new String(entry.getValue().get())), 100);
    assertFalse(iter.hasNext());

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    // master a message, the migration will refer to a non-existing tablet,
    // so it can never complete. Periodically scan the metadata table and
    // remove any migrating tablets that no longer exist.
    private void cleanupMutations() throws AccumuloException, AccumuloSecurityException, TableNotFoundException {
      Connector connector = getConnector();
      Scanner scanner = connector.createScanner(Constants.METADATA_TABLE_NAME, Constants.NO_AUTHS);
      ColumnFQ.fetch(scanner, Constants.METADATA_PREV_ROW_COLUMN);
      Set<KeyExtent> found = new HashSet<KeyExtent>();
      for (Entry<Key,Value> entry : scanner) {
        KeyExtent extent = new KeyExtent(entry.getKey().getRow(), entry.getValue());
        if (migrations.containsKey(extent)) {

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      m.put(new Text(elt[1]), new Text(elt[2]), new Value("1".getBytes()));
      bw.addMutation(m);
    }
    bw.close();
    
    Scanner s = c.createScanner("perDayCounts", Constants.NO_AUTHS);
    Iterator<Entry<Key,Value>> iterator = s.iterator();
    assertTrue(iterator.hasNext());
    checkEntry(iterator.next(), "bar", "day", "20080101", "2");
    assertTrue(iterator.hasNext());
    checkEntry(iterator.next(), "foo", "day", "20080101", "2");

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    m2.putDelete("cf1", "cq1", 2);
    
    bw.addMutation(m2);
    bw.flush();
    
    Scanner scanner = c.createScanner("test", Constants.NO_AUTHS);
    
    int count = 0;
    for (@SuppressWarnings("unused")
    Entry<Key,Value> entry : scanner) {
      count++;

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    bw.flush();
    
    int count = 10;
    
    Scanner scanner = c.createScanner("test", Constants.NO_AUTHS);
    for (Entry<Key,Value> entry : scanner) {
      Key key = entry.getKey();
      Mutation m = new Mutation(key.getRow());
      m.put(key.getColumnFamily().toString(), key.getColumnQualifier().toString(), key.getTimestamp() + 1, "v" + (count));
      count++;

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    b.flush();
    b = bw.getBatchWriter("b");
    b.addMutation(m1);
    b.flush();
    
    Scanner scanner = c.createScanner("a", Constants.NO_AUTHS);
    int count = 0;
    for (@SuppressWarnings("unused")
    Entry<Key,Value> entry : scanner) {
      count++;
    }

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    Entry<Key,Value> entry : scanner) {
      count++;
    }
    assertEquals(1, count);
    count = 0;
    scanner = c.createScanner("b", Constants.NO_AUTHS);
    for (@SuppressWarnings("unused")
    Entry<Key,Value> entry : scanner) {
      count++;
    }
    assertEquals(1, count);

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      bw.addMutation(m);
    }
    
    bw.close();
    
    Scanner scanner = c.createScanner("test", Constants.NO_AUTHS);
    
    Entry<Key,Value> entry = scanner.iterator().next();
    
    assertEquals("9", entry.getValue().toString());

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