Github user Parth-Brahmbhatt commented on the pull request:
https://github.com/apache/incubator-storm/pull/190#issuecomment-49469937
The simplest alternative seems to be no implementation for IAutoCredentials
needed for AutoHDFS to work. In other words users will not have to specify any
class for "topology.auto-credentials" config for auto hdfs to work.
User will specify AutoHDFS.java as "nimbus.credential.renewers.classes" and
AutoHDFS will only implement ICredentialsRenewer. In the prepare phase of
AutoHDFS.java, which should be called on nimbus startup, we can get the HDFS
credentials.
I have one clarifying question. The ICredentialsRenewer implementations
seems to be loaded by reading "nimbus.credential.renewers.classes" config at
startup by nimbus. If I understand correctly this means if we use
ICredentialsRenewer the users who have a running nimbus and wants to use
AutoHDFS will have to change the config and restart the nimbus. Is that
acceptable?
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