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error log with kerberos hdf cluster

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error log with kerberos hdf cluster

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HI

We are working with kerberos cluster, the version is HDF-2.0.0.0-centos6. Sometimes, we got the below error on my three nifi node.

2017-01-05 14:34:52,337 ERROR [Thread-18] o.a.r.admin.client.RangerAdminRESTClient Error getting policies. secureMode=true, user=nifi/xxxxxx@XXX (auth:KERBEROS), response={"httpStatusCode":404,"statusCode":0}, serviceName=xxx_nifi
2017-01-05 14:34:52,337 ERROR [Thread-18] o.a.ranger.plugin.util.PolicyRefresher PolicyRefresher(serviceName=xxx_nifi): failed to refresh policies. Will continue to use last known version of policies (27)
java.lang.Exception: HTTP 404
	at org.apache.ranger.admin.client.RangerAdminRESTClient.getServicePoliciesIfUpdated(RangerAdminRESTClient.java:126) ~[ranger-plugins-common-0.6.0.2.0.0.0-579.jar:0.6.0.2.0.0.0-579]
	at org.apache.ranger.plugin.util.PolicyRefresher.loadPolicyfromPolicyAdmin(PolicyRefresher.java:217) [ranger-plugins-common-0.6.0.2.0.0.0-579.jar:0.6.0.2.0.0.0-579]
	at org.apache.ranger.plugin.util.PolicyRefresher.loadPolicy(PolicyRefresher.java:185) [ranger-plugins-common-0.6.0.2.0.0.0-579.jar:0.6.0.2.0.0.0-579]
	at org.apache.ranger.plugin.util.PolicyRefresher.run(PolicyRefresher.java:158) [ranger-plugins-common-0.6.0.2.0.0.0-579.jar:0.6.0.2.0.0.0-579]
2017-01-05 14:34:53,110 INFO [Clustering Tasks Thread-2] o.a.n.c.c.ClusterProtocolHeartbeater Heartbeat created at 2017-01-05 14:34:53,016 and sent to xxxx.xxx.xx:9088 at 2017-01-05 14:34:53,110; send took 94 millis

I would like to know what reason is it? how to resolve it?

Thanks

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