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https://issues.apache.org/jira/browse/YARN-11011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17780120#comment-17780120
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ASF GitHub Bot commented on YARN-11011:
---------------------------------------

slfan1989 commented on code in PR #6211:
URL: https://github.com/apache/hadoop/pull/6211#discussion_r1373912872


##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/clientrm/FederationClientInterceptor.java:
##########
@@ -859,9 +869,8 @@ <R> Collection<R> invokeConcurrent(ClientMethod request, 
Class<R> clazz)
           results.put(subClusterId, clazz.cast(result));
         } catch (InterruptedException | ExecutionException e) {
           Throwable cause = e.getCause();
-          LOG.error("Cannot execute {} on {} : {}", request.getMethodName(),
-              subClusterId.getId(), cause.getMessage());
-          exceptions.put(subClusterId, e);

Review Comment:
   Thank you very much for your help in reviewing the code! I will improve this 
part of the code.





> Make YARN Router throw Exception to client clearly
> --------------------------------------------------
>
>                 Key: YARN-11011
>                 URL: https://issues.apache.org/jira/browse/YARN-11011
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: yarn
>    Affects Versions: 3.3.1
>            Reporter: Yuan Luo
>            Assignee: Shilun Fan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>         Attachments: router-error.png
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> When router submits job to yarn, the job is rejected by yarn for some reason. 
> Yarn router just throw exception to log and return not enough info to client.
> The router always throws the following non-obvious error to client:
> Exception in thread "main" 
> org.apache.hadoop.yarn.server.federation.policies.exceptions.FederationPolicyException:
> No active SubCluster available to submit the request.
> To make it easy for the user to locate the cause of a job submission failure, 
> we need to make Router throw the true cause of the error to the client 
> clearly.



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