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Subject: kerberos ticket renewal for hadoop services
how do long lived services such as the namenode or yarn resourcemanager
deal with kerberos ticket expiration for the user that runs the service?

do they periodically renew/refresh their tickets by calling
SecurityUtil.login(conf, keytab, user, host)?

where can i find an example the code that handles this (in
its easy to find the initial login but i cannot find the code that handles
with expiration/renewal/refresh of tickets)?

thanks! koert

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