Java Code Examples for org.apache.helix.model.LiveInstance#setLiveInstance()

The following examples show how to use org.apache.helix.model.LiveInstance#setLiveInstance() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: DistributedLeaderElection.java    From helix with Apache License 2.0 5 votes vote down vote up 
/**
 * @return true if the current manager created a new controller node successfully.
 */
private boolean tryCreateController(HelixManager manager) {
  HelixDataAccessor accessor = manager.getHelixDataAccessor();
  Builder keyBuilder = accessor.keyBuilder();

  LiveInstance newLeader = new LiveInstance(manager.getInstanceName());
  newLeader.setLiveInstance(ManagementFactory.getRuntimeMXBean().getName());
  newLeader.setSessionId(manager.getSessionId());
  newLeader.setHelixVersion(manager.getVersion());
  try {
    if (accessor.createControllerLeader(newLeader)) {
      updateHistory(manager);
      return true;
    } else {
      LOG.info(
          "Unable to become leader probably because some other controller became the leader.");
    }
  } catch (Exception e) {
    LOG.error(
        "Exception when trying to updating leader record in cluster:" + manager.getClusterName()
            + ". Need to check again whether leader node has been created or not.", e);
  }

  LiveInstance currentLeader = accessor.getProperty(keyBuilder.controllerLeader());
  if (currentLeader != null) {
    String currentSession = currentLeader.getEphemeralOwner();
    LOG.info("Leader exists for cluster: " + manager.getClusterName() + ", currentLeader: "
        + currentLeader.getInstanceName() + ", leaderSessionId: " + currentSession);
    if (currentSession != null && currentSession.equals(newLeader.getEphemeralOwner())) {
      return true;
    } else {
      LOG.warn("The existing leader has a different session. Expected session Id: " + newLeader
          .getEphemeralOwner());
    }
  }
  return false;
}
Example 2
Source File: TestControllerLeadershipChange.java    From helix with Apache License 2.0 5 votes vote down vote up 
private void setLeader(HelixManager manager) throws Exception {
  HelixDataAccessor accessor = manager.getHelixDataAccessor();
  final LiveInstance leader = new LiveInstance(manager.getInstanceName());
  leader.setLiveInstance(ManagementFactory.getRuntimeMXBean().getName());
  leader.setSessionId(manager.getSessionId());
  leader.setHelixVersion(manager.getVersion());

  // Delete the current controller leader node so it will trigger leader election
  while (!manager.isLeader()) {
    accessor.getBaseDataAccessor()
        .remove(PropertyPathBuilder.controllerLeader(manager.getClusterName()),
            AccessOption.EPHEMERAL);
    Thread.sleep(50);
  }
}