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https://issues.apache.org/jira/browse/YARN-7922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361017#comment-16361017
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Daryn Sharp commented on YARN-7922:
-----------------------------------
This shouldn't be able to happen. Distributed shell gets the renewer from
{{YarnClientUtils.getRmPrincipal}} which calls
{{SecurityUtil.getServerPrincipal}} to substitute _HOST. Yet somehow the
substitution did not occur.
The most conceivable, yet unlikely, way I see this failing is the principal has
more than 3 components, ie. <REALM> contains another / or @, which would cause
the substitution to short-out.
> Yarn dont resolve rm/_HOST to hostname
> --------------------------------------
>
> Key: YARN-7922
> URL: https://issues.apache.org/jira/browse/YARN-7922
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Affects Versions: 2.7.3
> Reporter: Berry Österlund
> Priority: Minor
>
> The normal auth_to_local usually removes everything after the / in the
> username of the Kerberos principle. That, together with the _HOST setting in
> the configuration files specifying the Kerberos principles is usually what is
> required to convert rm/_HOST@<REALM> to user yarn.
> In our environment, we cant use the default rules in auth_to_local. We have
> to specify each and every host and only convert those specifically. In other
> words, we don’t have the DEFAULT rule in auth_to_local. Ideally, the config
> for us would be the following
> {code:java}
> RULE:[1:$1@$0](rm@<REALM>)s/.*/invalid_user/
> RULE:[2:$1/$2@$0](rm/rm1_host.fulldomain@<REALM>)s/.*/yarn/
> RULE:[2:$1/$2@$0](rm/rm2_host.fulldomain@<REALM>)s/.*/yarn/
> {code}
> But if we use only that configuration, the servicecheck in Ambari failes with
> the following exception.
> {code:java}
> org.apache.hadoop.yarn.exceptions.YarnException: Failed to submit
> application_1518422080198_0002 to YARN : Failed to renew token: Kind:
> HDFS_DELEGATION_TOKEN, Service: ha-hdfs:devhadoop, Ident:
> (HDFS_DELEGATION_TOKEN token 11096 for ambari-qa)
> at
> org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.submitApplication(YarnClientImpl.java:272)
> at
> org.apache.hadoop.yarn.applications.distributedshell.Client.run(Client.java:708)
> at
> org.apache.hadoop.yarn.applications.distributedshell.Client.main(Client.java:215)
> {code}
>
> Inside the RM’s logfile, I can find the following.
> {code:java}
> Caused by: org.apache.hadoop.security.AccessControlException: yarn tries to
> renew a token with renewer rm/_HOST@<REALM>
> {code}
> Adding the following rule to auth_to_local solves the problem
> RULE:[2:$1/$2@$0](rm/_HOST@<REALM>)s/.*/yarn/
> The client used to test this is executed with the following command
> yarn org.apache.hadoop.yarn.applications.distributedshell.Client
> -shell_command ls -num_containers 1 -jar
> /usr/hdp/current/hadoop-yarn-client/hadoop-yarn-applications-distributedshell.jar
> -timeout 300000 --queue <YARN_QUEUE>
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