/**
   * JUnit.
   *
   * @throws Exception If failed.
   */
  @SuppressWarnings({"TooBroadScope"})
  public void testRestarts() throws Exception {
    int duration = 60 * 1000;
    int qryThreadNum = 10;
    final long nodeLifeTime = 2 * 1000;
    final int logFreq = 20;

    final IgniteCache<Integer, Integer> cache = grid(0).cache(null);

    assert cache != null;

    for (int i = 0; i < KEY_CNT; i++) cache.put(i, i);

    assertEquals(KEY_CNT, cache.localSize());

    final AtomicInteger qryCnt = new AtomicInteger();

    final AtomicBoolean done = new AtomicBoolean();

    IgniteInternalFuture<?> fut1 =
        multithreadedAsync(
            new CAX() {
              @Override
              public void applyx() throws IgniteCheckedException {
                while (!done.get()) {
                  Collection<Cache.Entry<Integer, Integer>> res =
                      cache.query(new SqlQuery(Integer.class, "_val >= 0")).getAll();

                  assertFalse(res.isEmpty());

                  int c = qryCnt.incrementAndGet();

                  if (c % logFreq == 0) info("Executed queries: " + c);
                }
              }
            },
            qryThreadNum);

    final AtomicInteger restartCnt = new AtomicInteger();

    CollectingEventListener lsnr = new CollectingEventListener();

    for (int i = 0; i < GRID_CNT; i++)
      grid(i).events().localListen(lsnr, EventType.EVT_CACHE_REBALANCE_STOPPED);

    IgniteInternalFuture<?> fut2 =
        multithreadedAsync(
            new Callable<Object>() {
              @SuppressWarnings({"BusyWait"})
              @Override
              public Object call() throws Exception {
                while (!done.get()) {
                  int idx = GRID_CNT;

                  startGrid(idx);

                  Thread.sleep(nodeLifeTime);

                  stopGrid(idx);

                  int c = restartCnt.incrementAndGet();

                  if (c % logFreq == 0) info("Node restarts: " + c);
                }

                return true;
              }
            },
            1);

    Thread.sleep(duration);

    done.set(true);

    fut1.get();
    fut2.get();

    info("Awaiting rebalance events [restartCnt=" + restartCnt.get() + ']');

    boolean success = lsnr.awaitEvents(GRID_CNT * 2 * restartCnt.get(), 15000);

    for (int i = 0; i < GRID_CNT; i++)
      grid(i).events().stopLocalListen(lsnr, EventType.EVT_CACHE_REBALANCE_STOPPED);

    assert success;
  }
  /**
   * @param cacheMode Cache mode.
   * @param sameAff If {@code false} uses different number of partitions for caches.
   * @param concurrency Transaction concurrency.
   * @param isolation Transaction isolation.
   * @throws Exception If failed.
   */
  private void crossCacheTxFailover(
      CacheMode cacheMode,
      boolean sameAff,
      final TransactionConcurrency concurrency,
      final TransactionIsolation isolation)
      throws Exception {
    IgniteKernal ignite0 = (IgniteKernal) ignite(0);

    final AtomicBoolean stop = new AtomicBoolean();

    try {
      ignite0.createCache(cacheConfiguration(CACHE1, cacheMode, 256));
      ignite0.createCache(cacheConfiguration(CACHE2, cacheMode, sameAff ? 256 : 128));

      final AtomicInteger threadIdx = new AtomicInteger();

      IgniteInternalFuture<?> fut =
          GridTestUtils.runMultiThreadedAsync(
              new Callable<Void>() {
                @Override
                public Void call() throws Exception {
                  int idx = threadIdx.getAndIncrement();

                  Ignite ignite = ignite(idx % GRID_CNT);

                  log.info(
                      "Started update thread [node="
                          + ignite.name()
                          + ", client="
                          + ignite.configuration().isClientMode()
                          + ']');

                  IgniteCache<TestKey, TestValue> cache1 = ignite.cache(CACHE1);
                  IgniteCache<TestKey, TestValue> cache2 = ignite.cache(CACHE2);

                  assertNotSame(cache1, cache2);

                  IgniteTransactions txs = ignite.transactions();

                  ThreadLocalRandom rnd = ThreadLocalRandom.current();

                  long iter = 0;

                  while (!stop.get()) {
                    boolean sameKey = rnd.nextBoolean();

                    try {
                      try (Transaction tx = txs.txStart(concurrency, isolation)) {
                        if (sameKey) {
                          TestKey key = new TestKey(rnd.nextLong(KEY_RANGE));

                          cacheOperation(rnd, cache1, key);
                          cacheOperation(rnd, cache2, key);
                        } else {
                          TestKey key1 = new TestKey(rnd.nextLong(KEY_RANGE));
                          TestKey key2 = new TestKey(key1.key() + 1);

                          cacheOperation(rnd, cache1, key1);
                          cacheOperation(rnd, cache2, key2);
                        }

                        tx.commit();
                      }
                    } catch (CacheException | IgniteException e) {
                      log.info("Update error: " + e);
                    }

                    if (iter++ % 500 == 0) log.info("Iteration: " + iter);
                  }

                  return null;
                }

                /**
                 * @param rnd Random.
                 * @param cache Cache.
                 * @param key Key.
                 */
                private void cacheOperation(
                    ThreadLocalRandom rnd, IgniteCache<TestKey, TestValue> cache, TestKey key) {
                  switch (rnd.nextInt(4)) {
                    case 0:
                      cache.put(key, new TestValue(rnd.nextLong()));

                      break;

                    case 1:
                      cache.remove(key);

                      break;

                    case 2:
                      cache.invoke(key, new TestEntryProcessor(rnd.nextBoolean() ? 1L : null));

                      break;

                    case 3:
                      cache.get(key);

                      break;

                    default:
                      assert false;
                  }
                }
              },
              10,
              "tx-thread");

      long stopTime = System.currentTimeMillis() + 3 * 60_000;

      long topVer = ignite0.cluster().topologyVersion();

      boolean failed = false;

      while (System.currentTimeMillis() < stopTime) {
        log.info("Start node.");

        IgniteKernal ignite = (IgniteKernal) startGrid(GRID_CNT);

        assertFalse(ignite.configuration().isClientMode());

        topVer++;

        IgniteInternalFuture<?> affFut =
            ignite
                .context()
                .cache()
                .context()
                .exchange()
                .affinityReadyFuture(new AffinityTopologyVersion(topVer));

        try {
          if (affFut != null) affFut.get(30_000);
        } catch (IgniteFutureTimeoutCheckedException e) {
          log.error("Failed to wait for affinity future after start: " + topVer);

          failed = true;

          break;
        }

        Thread.sleep(500);

        log.info("Stop node.");

        stopGrid(GRID_CNT);

        topVer++;

        affFut =
            ignite0
                .context()
                .cache()
                .context()
                .exchange()
                .affinityReadyFuture(new AffinityTopologyVersion(topVer));

        try {
          if (affFut != null) affFut.get(30_000);
        } catch (IgniteFutureTimeoutCheckedException e) {
          log.error("Failed to wait for affinity future after stop: " + topVer);

          failed = true;

          break;
        }
      }

      stop.set(true);

      fut.get();

      assertFalse("Test failed, see log for details.", failed);
    } finally {
      stop.set(true);

      ignite0.destroyCache(CACHE1);
      ignite0.destroyCache(CACHE2);

      awaitPartitionMapExchange();
    }
  }