Github user jtstorck commented on the issue:
https://github.com/apache/nifi/pull/2360
@jomach Anything that uses org.apache.hadoop.ipc.Client should handle
implicit relogin, through a method that handles connection failures:
org.apache.hadoop.ipc.Client.handleSaslConnectionFailure, which resides in
hadoop-common.
org.apache.hadoop.hdfs.DistributedFileSystem, in hadoop-hdfs, uses the
Client to connect to HDFS. If any failure occurs when making the connection,
the first thing it does is use UGI to relogin. With the knowledge of this, all
the explicit NiFi relogin logic has been removed in this PR.
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