Thanks Allen for bringing more history to this, and Erik for the discussion.

True they're logged in NN logs, but with different log rotation and level
of convenience for investigation, so I can see value adding these.
Will pursue the implementation on HDFS-12300 - more discussions welcome!

-Xiao

On Tue, Aug 15, 2017 at 8:10 AM, Erik Krogen <ekro...@linkedin.com> wrote:

> Given that the current audit log also includes the majority of read-only
> operations (getfileinfo, liststatus, etc.) it seems to me that the audit
> log's purpose has changed to be more of a record of both modifications and
> queries against the file system's metadata. The delegation token related
> operations match closely with what is currently in the audit log. Our team
> was also surprised to find that they were not currently present. Especially
> given that we have HDFS-6888 to limit the size of the audit log by omitting
> common operations, it does not seem harmful to add these token ops.
>
> Erik
>
> On 8/14/17, 5:44 PM, "Allen Wittenauer" <a...@apache.org> wrote:
>
>     [You don't often get email from a...@apache.org. Learn why this is
> important at http://aka.ms/LearnAboutSenderIdentification.]
>
>     On 2017-08-14 11:52, Xiao Chen <x...@cloudera.com> wrote:
>
>     > When inspecting the code, I found that the following methods in
>     > FSNamesystem are not audit logged:
>
>     ...
>
>     > I checked with ATM hoping for some history, but no known to him.
> Anyone
>     > know the reason to not audit log these?
>
>             The audit log was designed for keeping track of things that
> actually change the contents/metadata of the file system. Other HDFS
> operations were getting logged to the NN log or some other more appropriate
> to limit the noise.
>
>             https://effectivemachines.com/2017/03/08/unofficial-history-
> of-the-hdfs-audit-log/
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