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From Zsolt Tóth <>
Subject Re: Delegation Token renewal in yarn-cluster
Date Thu, 03 Nov 2016 20:29:37 GMT
Any ideas about this one? Am I missing something here?

2016-11-03 15:22 GMT+01:00 Zsolt Tóth <>:

> Hi,
> I ran some tests regarding Spark's Delegation Token renewal mechanism. As
> I see, the concept here is simple: if I give my keytab file and client
> principal to Spark, it starts a token renewal thread, and renews the
> namenode delegation tokens after some time. This works fine.
> Then I tried to run a long application (with HDFS operation in the end)
> without providing the keytab/principal to Spark, and I expected it to fail
> after the token expires. It turned out that this is not the case, the
> application finishes successfully without a delegation token renewal by
> Spark.
> My question is: how is that possible? Shouldn't a saveAsTextfile() fail
> after the namenode delegation token expired?
> Regards,
> Zsolt

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