delegation token not found in cache

[Raja . Aravapalli]

Hi,

Can someone please help me why my DAG is failing with below exception after 8 
days running succesfully!!



Caused by: 
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.token.SecretManager$InvalidToken):
 token (HDFS_DELEGATION_TOKEN token 000000 for <USER>) can't be found in cache
        at org.apache.hadoop.ipc.Client.call(Client.java:1427)
        at org.apache.hadoop.ipc.Client.call(Client.java:1358)




Thanks a lot.

Regards,
Raja.