Github user satishd commented on the issue:
https://github.com/apache/storm/pull/2519
@arunmahadevan @omkreddy I have looked into that code before putting my
initial comment. Not all `TokenIdentifier` implementations have implemented
`toString()` with user information.
`org.apache.hadoop.hbase.security.token.AuthenticationTokenIdentifier` does not
implement toString() and the logging statement was added while fixing
STORM-2555 with the change
[here](https://github.com/apache/storm/commit/2544b6d99f163cd2552485a629651f8e97fff8ee#diff-a81e93604bd2f50eae45a7a3bee59d88)
which is related to HBase delegation tokens.
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