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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3021) YARN's delegation-token handling disallows certain trust setups to operate properly over DistCp
Date Fri, 20 Mar 2015 00:29:40 GMT

    [ https://issues.apache.org/jira/browse/YARN-3021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14370440#comment-14370440

Jian He commented on YARN-3021:

thanks Yongjun, some comments on the patch !

- DelegationTokenRenewer: the skipTokenRenewal check should be done under the existing code
{{if (token.getKind().equals(new Text("HDFS_DELEGATION_TOKEN")))}} as below. And I think only
doing this check is enough, we don't need checks in other places.
      if (token.isManaged()) {
        if (token.getKind().equals(new Text("HDFS_DELEGATION_TOKEN"))) {
          LOG.info(applicationId + " found existing hdfs token " + token);
          hasHdfsToken = true;
          Text renewer = ((Token<AbstractDelegationTokenIdentifier>) token).
          if ((renewer != null && renewer.toString()
              .equals(Token.NON_RENEWER))) {

- does conf.getStrings strip off the leading or ending empty strings? if not, we may strip
those off.
String [] nns =
- given that this is a work-around fix, maybe not adding the NON_RENEWER publicly in common
? just check for null ?
- Did you test the patch on real cluster ?

> YARN's delegation-token handling disallows certain trust setups to operate properly over
> -----------------------------------------------------------------------------------------------
>                 Key: YARN-3021
>                 URL: https://issues.apache.org/jira/browse/YARN-3021
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.3.0
>            Reporter: Harsh J
>            Assignee: Yongjun Zhang
>         Attachments: YARN-3021.001.patch, YARN-3021.002.patch, YARN-3021.003.patch, YARN-3021.004.patch,
> Consider this scenario of 3 realms: A, B and COMMON, where A trusts COMMON, and B trusts
COMMON (one way trusts both), and both A and B run HDFS + YARN clusters.
> Now if one logs in with a COMMON credential, and runs a job on A's YARN that needs to
access B's HDFS (such as a DistCp), the operation fails in the RM, as it attempts a renewDelegationToken(…)
synchronously during application submission (to validate the managed token before it adds
it to a scheduler for automatic renewal). The call obviously fails cause B realm will not
trust A's credentials (here, the RM's principal is the renewer).
> In the 1.x JobTracker the same call is present, but it is done asynchronously and once
the renewal attempt failed we simply ceased to schedule any further attempts of renewals,
rather than fail the job immediately.
> We should change the logic such that we attempt the renewal but go easy on the failure
and skip the scheduling alone, rather than bubble back an error to the client, failing the
app submission. This way the old behaviour is retained.

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