Thanks for you answering.   I have a one more question.   I configured 3 Nifi Cluster Clustering with 3 node And I tried to use ListSFTP Component in NiFi Cluster, error occurs.   The error was   ERROR [Timer-Driven Process Thread-6] o.a.nifi.processors.standard.ListSFTP ListSFTP[id=c486c6ce-016e-1000-0000-000037351532] Failed to properly initialize Processor. If still scheduled to run, NiFi will attempt to initialize and run the Processor again after the 'Administrative Yield Duration' has elapsed. Failure is due to java.lang.IllegalArgumentException: A HostProvider may not be empty!: java.lang.IllegalArgumentException: A HostProvider may not be empty! java.lang.IllegalArgumentException: A HostProvider may not be empty! at org.apache.zookeeper.client.StaticHostProvider.init(StaticHostProvider.java:136) at org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:87) at org.apache.zookeeper.ZooKeeper.createDefaultHostProvider(ZooKeeper.java:1312) at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:951) at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:688) at org.apache.nifi.controller.state.providers.zookeeper.ZooKeeperStateProvider.getZooKeeper(ZooKeeperStateProvider.java:170) at org.apache.nifi.controller.state.providers.zookeeper.ZooKeeperStateProvider.getState(ZooKeeperStateProvider.java:403) at org.apache.nifi.controller.state.manager.StandardStateManagerProvider$1.getState(StandardStateManagerProvider.java:305) at org.apache.nifi.controller.state.StandardStateManager.getState(StandardStateManager.java:63) at org.apache.nifi.processor.util.list.AbstractListProcessor.updateState(AbstractListProcessor.java:298) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:142   I do not know how to fix it. In addition to your acticle, you said ListSFTP & ListHDFS were non-cluster friendly.   So, When I want to use ListSFTP in NiFi Cluster, I have to configure one more NiFi Cluster(Standalone)? My NiFi Cluster is 4(3 clustering, 1 standalone)?   plz help me..     ... View more