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https://issues.apache.org/jira/browse/YARN-11240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17582690#comment-17582690
 ] 

ASF GitHub Bot commented on YARN-11240:
---------------------------------------

slfan1989 commented on code in PR #4678:
URL: https://github.com/apache/hadoop/pull/4678#discussion_r950949402


##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/src/main/java/org/apache/hadoop/yarn/service/ServiceScheduler.java:
##########
@@ -1139,7 +1139,7 @@ public void syncSysFs(Service yarnApp) {
         LOG.info("YARN sysfs synchronized.");
       }
     } catch (IOException | URISyntaxException | InterruptedException e) {
-      LOG.error("Fail to sync service spec: {}", e);
+      LOG.error("Fail to sync service spec: {}", e.getMessage(), e);

Review Comment:
   Thank you very much for helping to review the code!
   
   There is a problem with the use of placeholders in this part of the code.
   
   When an exception occurs, the placeholder is not replaced, We can view the 
following logs.
   
   ```
   2022-08-22 09:59:13,755 ERROR [Listener at 0.0.0.0/51213] 
service.TestServiceAM (TestServiceAM.java:testSyncSysFS(556)) - 
   Fail to sync sysfs: {}
   java.lang.RuntimeException: tensorflow syncSysFs Error
        at 
org.apache.hadoop.yarn.service.ServiceScheduler.syncSysFs(ServiceScheduler.java:1137)
        at 
org.apache.hadoop.yarn.service.TestServiceAM.testSyncSysFS(TestServiceAM.java:551)
        ...
   ```
   
   Because the log uses the void error(String var1, Throwable var2); method, it 
cannot be replaced.
   
   So I added e.getMessage() to make the placeholder take effect and the log 
format would be better.
   
   ```
   2022-08-22 10:03:55,450 ERROR [Listener at 0.0.0.0/51354] 
service.TestServiceAM (TestServiceAM.java:testSyncSysFS(556)) - 
   Fail to sync sysfs: tensorflow syncSysFs Error
   java.lang.RuntimeException: tensorflow syncSysFs Error
        at 
org.apache.hadoop.yarn.service.ServiceScheduler.syncSysFs(ServiceScheduler.java:1137)
        at 
org.apache.hadoop.yarn.service.TestServiceAM.testSyncSysFS(TestServiceAM.java:551)
        ...
   ```





> Fix incorrect placeholder in yarn-module
> ----------------------------------------
>
>                 Key: YARN-11240
>                 URL: https://issues.apache.org/jira/browse/YARN-11240
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 3.4.0
>            Reporter: fanshilun
>            Assignee: fanshilun
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Try to deal with the moudle problem at a time.



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