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From Parth-Brahmbhatt <...@git.apache.org>
Subject [GitHub] incubator-storm pull request: STORM-346: added AutoHDFS class that...
Date Fri, 18 Jul 2014 20:14:29 GMT
Github user Parth-Brahmbhatt commented on the pull request:

    https://github.com/apache/incubator-storm/pull/190#issuecomment-49474731
  
    Here is what I have so far:
    
    User can 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. However, I don't think the topology
submitter user will be available at that time so we will not be able to get the token on behalf
of the user but only as nimbus which I feel is unacceptable. 
    
    In order to actually get the credentials as topology submitter user, we either need a
new Interface that will run on nimbus when a topology is submitted as part of submitTopologyWithOpts
implementation or we can add getCredentialForUser(Map conf) method to ICredentialsRenewer
interface and call that as part of submitTopologyWithOpts. I personally prefer not to pollute
the ICredentialsRenewer interface. Let me know if you have better alternatives or prefer one
over another.
    
    I have one last question. The ICredentialsRenewer implementations seems to be loaded by
reading "nimbus.credential.renewers.classes" config at startup by nimbus. This means the users
who have a running nimbus and wants to use AutoHDFS or any other implementation of ICredentialsRenewer
will have to change the config and restart the nimbus. Is that acceptable? 
    



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