Hello, This is Shaofeng Shi from Apache Kylin community; We're trying to use Helix as the cluster mangement framework for Kylin; But now I encounter an error when starting the controller;
In our case, we have a job engine node, which need be unique in the cluster, so we choose to use the LeaderStandby model (only the Leader will run it); Besides, we only allow some nodes can run the job engine, so we select to use SEMI_AUTO as the rebalance model. The code is much simple: register the state model, add resource, add instance, and register state model factory and connect; After that, when try to run HelixControllerMain.startHelixController(), it throws an error (here "kylin_metadata" is the cluster name): org.I0Itec.zkclient.exception.ZkNoNodeException: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /kylin_metadata/CONFIGS/CONSTRAINT at org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:47) at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:893) at org.apache.helix.manager.zk.ZkClient.getChildren(ZkClient.java:212) at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:601) at org.apache.helix.manager.zk.ZkCallbackHandler.subscribeForChanges(ZkCallbackHandler.java:304) at org.apache.helix.manager.zk.ZkCallbackHandler.invoke(ZkCallbackHandler.java:174) at org.apache.helix.manager.zk.ZkCallbackHandler.init(ZkCallbackHandler.java:336) at org.apache.helix.manager.zk.ZkCallbackHandler.<init>(ZkCallbackHandler.java:130) at org.apache.helix.manager.zk.ZkHelixConnection.addListener(ZkHelixConnection.java:533) at org.apache.helix.manager.zk.ZkHelixConnection.addConfigChangeListener(ZkHelixConnection.java:342) at org.apache.helix.manager.zk.ZkHelixController.addListenersToController(ZkHelixController.java:231) at org.apache.helix.manager.zk.ZkHelixLeaderElection.onControllerChange(ZkHelixLeaderElection.java:91) at org.apache.helix.manager.zk.ZkCallbackHandler.invoke(ZkCallbackHandler.java:220) at org.apache.helix.manager.zk.ZkCallbackHandler.init(ZkCallbackHandler.java:336) at org.apache.helix.manager.zk.ZkCallbackHandler.<init>(ZkCallbackHandler.java:130) at org.apache.helix.manager.zk.ZkHelixConnection.addListener(ZkHelixConnection.java:533) at org.apache.helix.manager.zk.ZkHelixConnection.addControllerListener(ZkHelixConnection.java:257) at org.apache.helix.manager.zk.ZkHelixController.init(ZkHelixController.java:137) at org.apache.helix.manager.zk.ZkHelixController.onConnected(ZkHelixController.java:149) at org.apache.helix.manager.zk.ZkHelixController.start(ZkHelixController.java:100) at org.apache.helix.manager.zk.ZKHelixManager.connect(ZKHelixManager.java:133) at org.apache.helix.controller.HelixControllerMain.startHelixController(HelixControllerMain.java:162) Seems it didn't find some node there; but I don't know how to solve or bypass that. If needed, I can provide the complete code. If someone can help or advise how to use in this scenario, that would be appreciated! -- Best regards, Shaofeng Shi
