reloginFromKeytab() should happen even if TGT can't be found
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Key: HADOOP-7091
URL: https://issues.apache.org/jira/browse/HADOOP-7091
Project: Hadoop Common
Issue Type: Bug
Components: security
Reporter: Kan Zhang
Assignee: Kan Zhang
HADOOP-6965 introduced a getTGT() method and prevents reloginFromTGT() from
happening when TGT is not found. This results in the RPC layer not being able
to refresh TGT after TGT expires. The reason is RPC layer only does relogin
when the expired TGT is used and an exception is thrown. However, when that
happens, the expired TGT will be removed from Subject. Therefore, getTGT() will
return null and relogin will not be performed. We observed that, for example,
JT will not be able to re-connect to NN after TGT expires.
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