Not able to upload a simple file using Ambari file view

[#1]

Hi,

We are trying to upload a simple file on the HDFS using Ambari file view. We are getting the following error:

 Failed to upload XXXXX_XXX_XX_Xh.xml to /XXX/XXXXX/XXX_2021_01_20

org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException): null
	at org.apache.hadoop.hdfs.web.JsonUtilClient.toRemoteException(JsonUtilClient.java:85)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:510)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$200(WebHdfsFileSystem.java:135)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.connect(WebHdfsFileSystem.java:736)
	at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$Ab...
          (more...)

Could you please help us?

Thank you

[#2]

If SSL is enabled on the cluster, make sure you import Namenode cert or RootCA certificate in Ambari Truststore

[#3]

@pbhagade Could you please give us the procedure to follow? It issue started to append after changing expired cetificat installed on each hosts of the hadoop cluster. The certicats were renewed but it seems that multiple service on the cluster are acting different and are generating error message like the one below:

2022-01-19 14:09:28,000 WARN AuthenticationToken ignored: org.apache.hadoop.security.authentication.util.SignerException: Invalid signature
2022-01-19 14:09:28,000 WARN Authentication exception: GSSException: Failure unspecified at GSS-API level (Mechanism level: Invalid argument (400) - Cannot find key of appropriate type to decrypt AP REP - RC4 with HMAC)