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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5663) Add an interface to Input/Ouput Formats to obtain delegation tokens
Date Tue, 14 Jan 2014 04:28:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13870375#comment-13870375
] 

Alejandro Abdelnur commented on MAPREDUCE-5663:
-----------------------------------------------

This works out of the box for MR jobs because typically the same FileSystem where the IN/OUT
data resides is he one used for the submission dir.

If you need to use different FileSystems (i.e. distcp), this is achieved setting the {{MRJobConfig.JOB_NAMENODES}}
property in the job confguration, this is handled in the {{JobSubmitter.java}} in the following
code:

{code}
  //get secret keys and tokens and store them into TokenCache
  private void populateTokenCache(Configuration conf, Credentials credentials) 
  throws IOException{
    readTokensFromFiles(conf, credentials);
    // add the delegation tokens from configuration
    String [] nameNodes = conf.getStrings(MRJobConfig.JOB_NAMENODES);
    LOG.debug("adding the following namenodes' delegation tokens:" + 
        Arrays.toString(nameNodes));
    if(nameNodes != null) {
      Path [] ps = new Path[nameNodes.length];
      for(int i=0; i< nameNodes.length; i++) {
        ps[i] = new Path(nameNodes[i]);
      }
      TokenCache.obtainTokensForNamenodes(credentials, ps, conf);
    }
  }
{code}


> Add an interface to Input/Ouput Formats to obtain delegation tokens
> -------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5663
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5663
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Siddharth Seth
>            Assignee: Michael Weng
>         Attachments: MAPREDUCE-5663.4.txt, MAPREDUCE-5663.5.txt, MAPREDUCE-5663.6.txt,
MAPREDUCE-5663.patch.txt, MAPREDUCE-5663.patch.txt2, MAPREDUCE-5663.patch.txt3
>
>
> Currently, delegation tokens are obtained as part of the getSplits / checkOutputSpecs
calls to the InputFormat / OutputFormat respectively.
> This works as long as the splits are generated on a node with kerberos credentials. For
split generation elsewhere (AM for example), an explicit interface is required.



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