Examples with RowResultIterator org.apache.kudu.client.RowResultIterator used on opensource projects

Example 1 with RowResultIterator

use of org.apache.kudu.client.RowResultIterator in project drill by apache.

the class TestKuduConnect method createKuduTable.

public static void createKuduTable(String tableName, int tablets, int replicas, int rows) throws Exception {
    try (KuduClient client = new KuduClient.KuduClientBuilder(KUDU_MASTER).build()) {
        ListTablesResponse tables = client.getTablesList(tableName);
        if (!tables.getTablesList().isEmpty()) {
            client.deleteTable(tableName);
        }
        List<ColumnSchema> columns = new ArrayList<>(5);
        columns.add(new ColumnSchema.ColumnSchemaBuilder("key", Type.INT32).key(true).build());
        columns.add(new ColumnSchema.ColumnSchemaBuilder("binary", Type.BINARY).nullable(false).build());
        columns.add(new ColumnSchema.ColumnSchemaBuilder("boolean", Type.BOOL).nullable(true).build());
        columns.add(new ColumnSchema.ColumnSchemaBuilder("float", Type.FLOAT).nullable(false).build());
        columns.add(new ColumnSchema.ColumnSchemaBuilder("string", Type.STRING).nullable(true).build());
        Schema schema = new Schema(columns);
        CreateTableOptions builder = new CreateTableOptions();
        builder.setNumReplicas(replicas);
        builder.setRangePartitionColumns(Arrays.asList("key"));
        for (int i = 1; i < tablets; i++) {
            PartialRow splitRow = schema.newPartialRow();
            splitRow.addInt("key", i * 1000);
            builder.addSplitRow(splitRow);
        }
        client.createTable(tableName, schema, builder);
        KuduTable table = client.openTable(tableName);
        KuduSession session = client.newSession();
        session.setFlushMode(SessionConfiguration.FlushMode.AUTO_FLUSH_SYNC);
        for (int i = 0; i < rows; i++) {
            Insert insert = table.newInsert();
            PartialRow row = insert.getRow();
            row.addInt(0, i);
            row.addBinary(1, ("Row " + i).getBytes());
            row.addBoolean(2, i % 2 == 0);
            row.addFloat(3, i + 0.01f);
            row.addString(4, ("Row " + i));
            session.apply(insert);
        }
        List<String> projectColumns = new ArrayList<>(1);
        projectColumns.add("float");
        KuduScanner scanner = client.newScannerBuilder(table).setProjectedColumnNames(projectColumns).build();
        while (scanner.hasMoreRows()) {
            RowResultIterator results = scanner.nextRows();
            while (results.hasNext()) {
                RowResult result = results.next();
                System.out.println(result.toStringLongFormat());
            }
        }
    }
}