Xiao Chen commented on HADOOP-12649:

Linking HADOOP-13590 here which does #4 of the description. Reviews appreciated.

> Improve Kerberos diagnostics and failure handling
> -------------------------------------------------
>                 Key: HADOOP-12649
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12649
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.7.1
>         Environment: Kerberos
>            Reporter: Steve Loughran
> Sometimes —apparently— some people cannot get kerberos to work.
> The ability to diagnose problems here is hampered by some aspects of UGI
> # the only way to turn on JAAS debug information is through an env var, not 
> within the JVM
> # failures are potentially underlogged
> # exceptions raised are generic IOEs, so can't be trapped and filtered
> # failure handling on the TGT renewer thread is nonexistent
> # the code is barely-readable, underdocumented mess.

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