How to use

forDataNodes

method

in

org.apache.ignite.cluster.ClusterGroup

/** {@inheritDoc} */
@Override public ClusterGroup forIgfsMetadataDataNodes(String igfsName, String metaCacheName) {
  assert metaCacheName != null;
  return forPredicate(new IgfsNodePredicate(igfsName)).forDataNodes(metaCacheName);
}

/**
 * @param cacheName Cache name.
 */
private int mapped(String cacheName) {
  int mapped = 0;
  ClusterGroup srvs = ignite.cluster().forServers();
  Collection<ClusterNode> nodes = srvs.forDataNodes(cacheName).nodes();
  for (ClusterNode node : nodes)
    mapped += ignite.affinity(cacheName).primaryPartitions(node).length;
  return mapped;
}

/**
 * @throws Exception If failed.
 */
@Test
public void testEmptyGroup() throws Exception {
  ClusterGroup emptyGrp = ignite.cluster().forAttribute("nonExistent", "val");
  assertEquals(0, emptyGrp.forOldest().nodes().size());
  assertEquals(0, emptyGrp.forYoungest().nodes().size());
  assertEquals(0, emptyGrp.forAttribute("nonExistent2", "val").nodes().size());
  assertEquals(0, emptyGrp.forCacheNodes("cacheName").nodes().size());
  assertEquals(0, emptyGrp.forClientNodes("cacheName").nodes().size());
  assertEquals(0, emptyGrp.forClients().nodes().size());
  assertEquals(0, emptyGrp.forDaemons().nodes().size());
  assertEquals(0, emptyGrp.forDataNodes("cacheName").nodes().size());
  assertEquals(0, emptyGrp.forRandom().nodes().size());
  assertEquals(0, emptyGrp.forRemotes().nodes().size());
  assertEquals(0, emptyGrp.forServers().nodes().size());
  assertEquals(0, emptyGrp.forHost(ignite.cluster().localNode()).nodes().size());
  assertEquals(0, emptyGrp.forHost("127.0.0.1").nodes().size());
}

/** {@inheritDoc} */
@Override public ClusterGroup forIgfsMetadataDataNodes(String igfsName, String metaCacheName) {
  assert metaCacheName != null;
  return forPredicate(new IgfsNodePredicate(igfsName)).forDataNodes(metaCacheName);
}

/**
 * @param cacheName Cache name.
 */
private int mapped(String cacheName) {
  int mapped = 0;
  ClusterGroup srvs = ignite.cluster().forServers();
  Collection<ClusterNode> nodes = srvs.forDataNodes(cacheName).nodes();
  for (ClusterNode node : nodes)
    mapped += ignite.affinity(cacheName).primaryPartitions(node).length;
  return mapped;
}