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https://issues.apache.org/jira/browse/HADOOP-13669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15569758#comment-15569758
 ] 

Xiao Chen commented on HADOOP-13669:
------------------------------------

{noformat}
============================================================================
                         findbugs detection: trunk
============================================================================
...
hadoop-common-project/hadoop-kms in trunk has 2 extant Findbugs warnings.

============================================================================
                         findbugs detection: patch
============================================================================
============================================================================


cd /testptch/hadoop/hadoop-common-project/hadoop-kms
mvn -Dmaven.repo.local=/home/jenkins/yetus-m2/hadoop-trunk-patch-1 -Ptest-patch 
-DskipTests test-compile findbugs:findbugs -DskipTests=true > 
/testptch/hadoop/patchprocess/patch-findbugs-hadoop-common-project_hadoop-kms.txt
 2>&1
Elapsed:   0m 21s
Starting with 
/testptch/hadoop/patchprocess/branch-findbugs-hadoop-common-project_hadoop-kms-warnings.xml
Merging 
/testptch/hadoop/patchprocess/patch-findbugs-hadoop-common-project_hadoop-kms-warnings.xml
Writing 
/testptch/hadoop/patchprocess/combined-findbugs-hadoop-common-project_hadoop-kms.xml

{noformat}

The addendum patch fixed the errors. I think this is ready for commit, [~aw] 
could you take a look? Thanks a lot.


> KMS Server should log exceptions before throwing
> ------------------------------------------------
>
>                 Key: HADOOP-13669
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13669
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: kms
>            Reporter: Xiao Chen
>            Assignee: Suraj Acharya
>              Labels: supportability
>             Fix For: 2.8.0, 3.0.0-alpha2
>
>         Attachments: HADOOP-13369.2.patch, HADOOP-13369.patch, 
> HADOOP-13369.patch.1, HADOOP-13669.addendum.patch, trigger.patch
>
>
> In some recent investigation, it turns out when KMS throws an exception (into 
> tomcat), it's not logged anywhere and we can only see the exception message 
> from client-side, but not the stacktrace. Logging the stacktrance would help 
> debugging.



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