/** @throws Exception If failed. */
  public void testAffinityPut() throws Exception {
    Thread.sleep(2 * TOP_REFRESH_FREQ);

    assertEquals(NODES_CNT, client.compute().refreshTopology(false, false).size());

    Map<UUID, Grid> gridsByLocNode = new HashMap<>(NODES_CNT);

    GridClientData partitioned = client.data(PARTITIONED_CACHE_NAME);

    GridClientCompute compute = client.compute();

    for (int i = 0; i < NODES_CNT; i++) gridsByLocNode.put(grid(i).localNode().id(), grid(i));

    for (int i = 0; i < 100; i++) {
      String key = "key" + i;

      UUID primaryNodeId = grid(0).mapKeyToNode(PARTITIONED_CACHE_NAME, key).id();

      assertEquals("Affinity mismatch for key: " + key, primaryNodeId, partitioned.affinity(key));

      assertEquals(primaryNodeId, partitioned.affinity(key));

      // Must go to primary node only. Since backup count is 0, value must present on
      // primary node only.
      partitioned.put(key, "val" + key);

      for (Map.Entry<UUID, Grid> entry : gridsByLocNode.entrySet()) {
        Object val = entry.getValue().cache(PARTITIONED_CACHE_NAME).peek(key);

        if (primaryNodeId.equals(entry.getKey())) assertEquals("val" + key, val);
        else assertNull(val);
      }
    }

    // Now check that we will see value in near cache in pinned mode.
    for (int i = 100; i < 200; i++) {
      String pinnedKey = "key" + i;

      UUID primaryNodeId = grid(0).mapKeyToNode(PARTITIONED_CACHE_NAME, pinnedKey).id();

      UUID pinnedNodeId = F.first(F.view(gridsByLocNode.keySet(), F.notEqualTo(primaryNodeId)));

      GridClientNode node = compute.node(pinnedNodeId);

      partitioned.pinNodes(node).put(pinnedKey, "val" + pinnedKey);

      for (Map.Entry<UUID, Grid> entry : gridsByLocNode.entrySet()) {
        Object val = entry.getValue().cache(PARTITIONED_CACHE_NAME).peek(pinnedKey);

        if (primaryNodeId.equals(entry.getKey()) || pinnedNodeId.equals(entry.getKey()))
          assertEquals("val" + pinnedKey, val);
        else assertNull(val);
      }
    }
  }
  /** {@inheritDoc} */
  @SuppressWarnings("BusyWait")
  @Override
  public Boolean reduce(List<GridComputeJobResult> results) throws GridException {
    assert taskSes != null;
    assert results != null;
    assert params != null;
    assert !params.isEmpty();
    assert results.size() == params.size();

    Map<String, Integer> receivedParams = new HashMap<>();

    boolean allAttrReceived = false;

    int cnt = 0;

    while (!allAttrReceived && cnt++ < 3) {
      allAttrReceived = true;

      for (Map.Entry<String, Integer> entry : params.entrySet()) {
        assert taskSes.getAttribute(entry.getKey()) != null;

        Integer newVal = (Integer) taskSes.getAttribute(entry.getKey());

        assert newVal != null;

        receivedParams.put(entry.getKey(), newVal);

        if (newVal != entry.getValue() + 1) allAttrReceived = false;
      }

      if (!allAttrReceived) {
        try {
          Thread.sleep(100);
        } catch (InterruptedException e) {
          throw new GridException("Thread interrupted.", e);
        }
      }
    }

    if (log.isDebugEnabled()) {
      for (Map.Entry<String, Integer> entry : receivedParams.entrySet()) {
        log.debug(
            "Received session attr value [name="
                + entry.getKey()
                + ", val="
                + entry.getValue()
                + ", expected="
                + (params.get(entry.getKey()) + 1)
                + ']');
      }
    }

    return allAttrReceived;
  }