Github user vijikarthi commented on the issue:
https://github.com/apache/flink/pull/2425
>
How is the secret transferred to the TaskManagers on YARN?
Cookie is transferred to TM container through container environment
variable and further gets populated to in-memory Flink configuration instance.
The secure cookie is vulnerable (so as the Keytab file) to the users who has
access to the container local resource storage area and that's the limitation
we may have to deal with.
>Is using the JobManagerMessages.getRequestBlobManagerSecureCookie()
message always secure?
I believe it is safe since Akka endpoints are secured using the shared
token (cookie) and for someone to access the cookie using the
"JobManagerMessages.getRequestBlobManagerSecureCookie()", they should have been
authenticated first.
>
Maybe it also makes sense to start adding a page into the internals
documentation section, explaining how the secure cookie is implemented.
I am planning to add a separate page to internals documentation explaining
how the shared secret stuff is implemented for various deployment options -
Standalone, Yarn, Mesos (tbd)
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