[jira] [Work logged] (GOBBLIN-1286) Support fetching multiple DFS tokens for HDFS Federation

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GOBBLIN-1286?focusedWorklogId=500077&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-500077 ]

ASF GitHub Bot logged work on GOBBLIN-1286:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 13/Oct/20 14:10
            Start Date: 13/Oct/20 14:10
    Worklog Time Spent: 10m 
      Work Description: sandy143651 opened a new pull request #3125:
URL: https://github.com/apache/incubator-gobblin/pull/3125


   Dear Gobblin maintainers,
   
   Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!
   
   
   ### JIRA
   - [ ] My PR addresses the following [Gobblin JIRA](https://issues.apache.org/jira/browse/GOBBLIN/) issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
       - https://issues.apache.org/jira/browse/GOBBLIN-XXX
   https://issues.apache.org/jira/browse/GOBBLIN-1286
   
   ### Description
   - [ ] Here are some details about my PR, including screenshots (if applicable):
   Changed the method to use org.apache.hadoop.fs.FileSystem#addDelegationTokens instead of org.apache.hadoop.fs.FileSystem#getDelegationTokens which makes sure that DTs for all the child namenodes are also fetched. Note that this change is backwards-compatible.
   ### Tests
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   The change is straightforward and doesn't require explicit unit testing.
   
   ### Commits
   - [ ] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
       1. Subject is separated from body by a blank line
       2. Subject is limited to 50 characters
       3. Subject does not end with a period
       4. Subject uses the imperative mood ("add", not "adding")
       5. Body wraps at 72 characters
       6. Body explains "what" and "why", not "how"
   
   


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 500077)
    Remaining Estimate: 0h
            Time Spent: 10m

> Support fetching multiple DFS tokens for HDFS Federation
> --------------------------------------------------------
>
>                 Key: GOBBLIN-1286
>                 URL: https://issues.apache.org/jira/browse/GOBBLIN-1286
>             Project: Apache Gobblin
>          Issue Type: Improvement
>          Components: misc
>            Reporter: Sandeep Devaiah
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Currently org.apache.gobblin.util.hadoop.TokenUtils#getHdfsToken adds the DistributedFileSystem's delegation token to the Credential's object. However, if the DFS is federated, then only one token for the primary name node is fetched and tokens for child namenodes are not fetched.
> Hence this method needs to be updated to use org.apache.hadoop.fs.FileSystem#addDelegationTokens instead of org.apache.hadoop.fs.FileSystem#getDelegationTokens which automatically fetches the delegation tokens for all child FS as well.



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