Creating HDF Flow Management clusters
When creating a Flow Management cluster from the default blueprint, make sure to follow these guidelines.
- Open 9091 TCP port on the NiFi host group. This port is used by NiFi web UI; Without it, you will be unable to access the NiFi web UI.
- Open 61443 TCP port on the Services host group. This port is used by NiFi Registry.
LDAP and Kerberos
- If using LDAP, you must first register it as an external authentication source in the Cloudbreak web UI.
- If using Kerberos, you can either use your own Kerberos (for production) or select for Cloudbreak to create a test KDC (for evaluation only).
Cluster user vs LDAP users
- You must specify a Cluster User that is a valid user in the LDAP. This is a limitation with NiFi/NiFi Registry. Only one login provider can be configured for those components, and if an LDAP is supplied, then the login provider is set to LDAP; Consequently, this requires that the initial admin be in the given LDAP.
- While the passwords don’t need to match between the cluster user and the same-named LDAP user, any other components that are used by that cluster user would require the password entered for the cluster user, not the same-named LDAP user.
Creating the NiFi Registry controller service in NiFi
When creating the NiFi Registry controller service in NiFi, the internal hostname must
Creating a custom HDF blueprint with NiFi
If you are creating a custom HDF blueprint which includes Apache NiFi, you must add the "nifi-bootstrap-env" configuration to the "configurations" section of the blueprint, exactly as it is done in this example: https://github.com/hortonworks/cloudbreak/blob/release-2.9/core/src/main/resources/defaults/blueprints/hdf32-flow-management.bp#L19-%23L21.
You can modify the value of nifi-bootstrap-env's "content" property, but the java.io.tmpdir arg is required to be populated with a directory that does not have noexec set on it, and the NiFi user must be able to write to that directory.
Scaling and autoscaling
- Downscaling NiFi clusters is not supported - as it can result in data loss when a node is removed that has not yet processed all the data on that node.
- There is a known issue related to upscaling.
Troubleshooting HDF Flow Management cluster creation
NiFi returns the following error when the Flow Management cluster is set up with an LDAP:
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authorizer': FactoryBean threw exception on object creation; nested exception is org.apache.nifi.authorization.exception.AuthorizerCreationException: org.apache.nifi.authorization.exception.AuthorizerCreationException: Unable to locate initial admin admin to seed policies at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175) at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103) at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1634) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:317) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351) ... 90 common frames omitted Caused by: org.apache.nifi.authorization.exception.AuthorizerCreationException: org.apache.nifi.authorization.exception.AuthorizerCreationException: Unable to locate initial admin admin to seed policies at org.apache.nifi.authorization.FileAccessPolicyProvider.onConfigured(FileAccessPolicyProvider.java:231) 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.authorization.AccessPolicyProviderInvocationHandler.invoke(AccessPolicyProviderInvocationHandler.java:46) at com.sun.proxy.$Proxy72.onConfigured(Unknown Source) at org.apache.nifi.authorization.AuthorizerFactoryBean.getObject(AuthorizerFactoryBean.java:143) at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ... 95 common frames omitted Caused by: org.apache.nifi.authorization.exception.AuthorizerCreationException: Unable to locate initial admin admin to seed policies at org.apache.nifi.authorization.FileAccessPolicyProvider.populateInitialAdmin(FileAccessPolicyProvider.java:566) at org.apache.nifi.authorization.FileAccessPolicyProvider.load(FileAccessPolicyProvider.java:509) at org.apache.nifi.authorization.FileAccessPolicyProvider.onConfigured(FileAccessPolicyProvider.java:222) ... 103 common frames omitted
When creating a HDF cluster with LDAP, on the Security page of the create cluster wizard you specified some Cluster User that is not a valid user in the LDAP.
When creating a HDF cluster with LDAP, on the Security page of the create cluster wizard, specify a Cluster User that is a valid user in the LDAP.