@Test
public void testGet() throws Exception {

    int getNum = 3000;
    List<String[]> keys = Lists.newArrayList();
    for (int i = 0; i < getNum; i++) {
        String[] keyi = new String[] { "keyyyyy" + random.nextInt(sourceRowNum) };
        keys.add(keyi);
    }
    long start = System.currentTimeMillis();
    for (int i = 0; i < getNum; i++) {
        String[] row = lookupTable.getRow(new Array<>(keys.get(i)));
        if (row == null) {
            System.out.println("null value for key:" + Arrays.toString(keys.get(i)));
        }
    }
    long take = System.currentTimeMillis() - start;
    System.out.println("muliti get " + getNum + " rows, take " + take + " ms");
}