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https://issues.apache.org/jira/browse/YARN-5910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15700365#comment-15700365
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Allen Wittenauer commented on YARN-5910:
----------------------------------------
bq. Not fully getting your point.
Yup. I'm aware of that.
> Support for multi-cluster delegation tokens
> -------------------------------------------
>
> Key: YARN-5910
> URL: https://issues.apache.org/jira/browse/YARN-5910
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: security
> Reporter: Clay B.
> Priority: Minor
>
> As an administrator running many secure (kerberized) clusters, some which
> have peer clusters managed by other teams, I am looking for a way to run jobs
> which may require services running on other clusters. Particular cases where
> this rears itself are running something as core as a distcp between two
> kerberized clusters (e.g. {{hadoop --config /home/user292/conf/ distcp
> hdfs://LOCALCLUSTER/user/user292/test.out
> hdfs://REMOTECLUSTER/user/user292/test.out.result}}).
> Thanks to YARN-3021, once can run for a while but if the delegation token for
> the remote cluster needs renewal the job will fail[1]. One can pre-configure
> their {{hdfs-site.xml}} loaded by the YARN RM to know of all possible HDFSes
> available but that requires coordination that is not always feasible,
> especially as a cluster's peers grow into the tens of clusters or across
> management teams. Ideally, one could have core systems configured this way
> but jobs could also specify their own handling of tokens and management when
> needed?
> [1]: Example stack trace when the RM is unaware of a remote service:
> ----------------
> {code}
> 2016-03-23 14:59:50,528 INFO
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer:
> application_1458441356031_3317 found existing hdfs token Kind:
> HDFS_DELEGATION_TOKEN, Service: ha-hdfs:REMOTECLUSTER, Ident:
> (HDFS_DELEGATION_TOKEN token
> 10927 for user292)
> 2016-03-23 14:59:50,557 WARN
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer:
> Unable to add the application to the delegation token renewer.
> java.io.IOException: Failed to renew token: Kind: HDFS_DELEGATION_TOKEN,
> Service: ha-hdfs:REMOTECLUSTER, Ident: (HDFS_DELEGATION_TOKEN token 10927 for
> user292)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.handleAppSubmitEvent(DelegationTokenRenewer.java:427)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.access$700(DelegationTokenRenewer.java:78)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.handleDTRenewerAppSubmitEvent(DelegationTokenRenewer.java:781)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.run(DelegationTokenRenewer.java:762)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> Caused by: java.io.IOException: Unable to map logical nameservice URI
> 'hdfs://REMOTECLUSTER' to a NameNode. Local configuration does not have a
> failover proxy provider configured.
> at org.apache.hadoop.hdfs.DFSClient$Renewer.getNNProxy(DFSClient.java:1164)
> at org.apache.hadoop.hdfs.DFSClient$Renewer.renew(DFSClient.java:1128)
> at org.apache.hadoop.security.token.Token.renew(Token.java:377)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$1.run(DelegationTokenRenewer.java:516)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$1.run(DelegationTokenRenewer.java:513)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.renewToken(DelegationTokenRenewer.java:511)
> at
> org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.handleAppSubmitEvent(DelegationTokenRenewer.java:425)
> ... 6 more
> {code}
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