@RunWith(JUnit4.class)

public final class GraphMutationTest {
  private static final int NUM_TRIALS = 50;
  private static final int NUM_NODES = 100;
  private static final int NUM_EDGES = 1000;
  private static final int NODE_POOL_SIZE = 1000; // must be >> NUM_NODES

  @Test
  public void directedGraph() {
    testGraphMutation(GraphBuilder.directed());
  }

  @Test
  public void undirectedGraph() {

# NUM_NODES should not be specified by the user. Instead we use
# NUM_NODES=KUBEMARK_AUTOSCALER_MAX_NODES. This gives other cluster components
# (e.g. kubemark master, Heapster) enough resources to handle maximum cluster size.
if [[ "${ENABLE_KUBEMARK_CLUSTER_AUTOSCALER}" == "true" ]]; then
  NUM_REPLICAS=1
  if [[ -n "$NUM_NODES" ]]; then

MACHINE_TYPE=${MACHINE_TYPE:-n1-standard-4}
NUM_NODES=${NUM_NODES:-3}
# Store the previous value (which may have been unset) so we can restore it on cleanup
OLD_USE_CLIENT_CERT=$(gcloud config list 2>/dev/null | grep use_client_certificate | cut -d' ' -f3)

function usage() {
  echo "${0} -p PROJECT [-z ZONE] [-c CLUSTER_NAME] [-v CLUSTER_VERSION] [-m MACHINE_TYPE] [-n NUM_NODES]"
  echo ''
  # shellcheck disable=SC2016

# User defined
# number of real workers in spawnTester cluster
NUM_NODES="${NUM_NODES:-2}"
# spec of real workers in spawnTester cluster
NODE_SIZE=${NODE_SIZE:-u2c.2x4}
DESIRED_NODES="${DESIRED_NODES:-10}"
# number of hollow nodes
# TODO: once IKS supports `kubetest`, i.e. the base cluster provisioning implemented in `kubetest`
# we can use NUM_NODES=${KUBEMARK_NUM_NODES:-10} to avoid usage of KUBEMARK_NUM_NODES

# limitations under the License.

# Returns the total number of Linux and Windows nodes in the cluster.
#
# Vars assumed:
#   NUM_NODES
#   NUM_WINDOWS_NODES
function get-num-nodes {
  echo "$((NUM_NODES + NUM_WINDOWS_NODES))"
}

# Vars assumed:
#   NUM_NODES
#   NUM_WINDOWS_NODES
function get-master-size {
  local suggested_master_size=2
  if [[ "$(get-num-nodes)" -gt "10" ]]; then

  export MULTIZONE="${2}"
fi
if [[ -n "${3:-}" ]]; then
  export KUBE_REPLICATE_EXISTING_MASTER="${3}"
fi
if [[ -n "${4:-}" ]]; then
  export KUBE_USE_EXISTING_MASTER="${4}"
fi
if [[ -z "${NUM_NODES:-}" ]]; then
  export NUM_NODES=3
fi

MASTER_IP="${MASTER_IP:-}"

# The container registry and project given to the kubemark container:
#   $CONTAINER_REGISTRY/$PROJECT/kubemark
#
CONTAINER_REGISTRY="${CONTAINER_REGISTRY:-}"
PROJECT="${PROJECT:-}"

NUM_NODES="${NUM_NODES:-1}"

KUBELET_TEST_LOG_LEVEL="${KUBELET_TEST_LOG_LEVEL:-}"
KUBEPROXY_TEST_LOG_LEVEL="${KUBEPROXY_TEST_LOG_LEVEL:-}"

             nullptr);
}

Status ClientSession::Impl::MaybeExtendGraph() const {
  mutex_lock l(mu_);
  int num_nodes = graph_->num_node_ids();
  if (num_nodes > last_num_graph_nodes_) {
    GraphDef graph_def;
    graph_->ToGraphDefSubRange(&graph_def, last_num_graph_nodes_);
    last_num_graph_nodes_ = num_nodes;
    return session_->Extend(graph_def);
  }
  return absl::OkStatus();
}

Linux worker node is required and two are recommended because many default
cluster-addons (e.g., `kube-dns`) need to run on Linux nodes. The master control
plane only runs on Linux.

```bash
export NUM_NODES=2  # number of Linux nodes
export NUM_WINDOWS_NODES=2
export KUBE_GCE_ENABLE_IP_ALIASES=true
export KUBERNETES_NODE_PLATFORM=windows
export LOGGING_STACKDRIVER_RESOURCE_TYPES=new
```

```bash
gcloud container clusters \
  create ${CLUSTER_NAME} \
  --zone ${ZONE} \
  --project ${PROJECT_ID} \
  --cluster-version ${CLUSTER_VERSION} \
  --machine-type ${MACHINE_TYPE} \
  --num-nodes ${NUM_NODES} \
  --enable-kubernetes-alpha \
  --no-enable-legacy-authorization
 ```

* `CLUSTER_NAME`: Whatever suits your fancy, 'istio-e2e' is a good choice.
* `ZONE`: 'us-central1-f' is a good value to use.