Github user SaintBacchus commented on the pull request:
https://github.com/apache/spark/pull/8867#issuecomment-142468611
@harishreedharan @tgravescs Hadoop RPC actually will do the re-login with
the keytab but the token only can persist 7 days by default. So it must be
updated.
The test step is below:
1. shorter the configutation `dfs.namenode.delegation.token.max-lifetime`
and `dfs.namenode.delegation.token.renew-interval`, maybe 10min
2.start a `spark-shell` or `spark-sql`
3.After 15min, execuse a job
Then the application will fail with token expired exception.
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