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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4281) 2.7 RM app page is broken
Date Tue, 20 Oct 2015 20:23:27 GMT

    [ https://issues.apache.org/jira/browse/YARN-4281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14965685#comment-14965685

Jason Lowe commented on YARN-4281:

The intent is to bring this code better inline with what's happening on branch-2, now that
YARN-3248 was committed to branch-2.7 (and broke the RM UI as a result).  As such I have a
few whitespace nits on the patch which when fixed should help remove some potentials for merge
conflicts when cherry-picking other changes from branch-2.  For reference I was diffing the
patched version of AppBlock.java and RMAppBlock.java against commit c9ee316045b83b18cb068aa4de739a1f4b50f02a
which is where YARN-3544 went into branch-2.  Any diffs that don't belong to another commit
delta between branch-2 and branch-2.7 are what's flagged below.

For this patch hunk, the original YARN-3248 did not have the appReport = null line, just the
appReport declaration.  Also there's an additional whitespace line that was added by this
patch which should not be there:
@@ -87,8 +86,9 @@ protected void render(Block html) {
-    callerUGI = getCallerUGI();
-    ApplicationReport appReport;
+    UserGroupInformation callerUGI = getCallerUGI();
+    ApplicationReport appReport = null;
     try {
       final GetApplicationReportRequest request =

Similarly, the patch leaves an additional whitespace line where the import code was deleted
and adds a new whitespace line where it was added back in:
@@ -20,21 +20,14 @@
 import static org.apache.hadoop.yarn.webapp.view.JQueryUI._INFO_WRAP;
-import java.security.PrivilegedExceptionAction;
-import java.util.Collection;
-import java.util.Set;
 import org.apache.commons.lang.StringEscapeUtils;
 import org.apache.commons.logging.Log;


 import com.google.inject.Inject;
+import java.util.Collection;
+import java.util.Set;
 public class RMAppBlock extends AppBlock{
   private static final Log LOG = LogFactory.getLog(RMAppBlock.class);


> 2.7 RM app page is broken
> -------------------------
>                 Key: YARN-4281
>                 URL: https://issues.apache.org/jira/browse/YARN-4281
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Chang Li
>            Assignee: Chang Li
>            Priority: Blocker
>         Attachments: YARN-4281-branch-2.7.patch, YARN-4281.2.7.modify.patch
> 2.7 RM app page is broken by the cherry pick of YARN-3248 on 23/Sep. It broke the work
around 2.7 patch of YARN-3544 to let it still use container report. Currently, our cluster's
2.7 RM app page is completely broken due to 500 error, which is caused by when user UGI is
null, completed app can not retrieve its container report, and in that code path, it doesn't
catch ContainerNotFoundException, but throw the exception, therefore cause the 500 error.
>  Running app is also broken because of the way it construct containerID by 
> {code} "ContainerId.newContainerId(
>               appAttemptReport.getApplicationAttemptId(), 1)" 
> {code}, 
> which will not include epoch number in ID, so it will also get ContainerNotFoundException
and throw 500 error.
> Propose to use the branch-2 version of YARN-3544, instead of the work around 2.7 patch
because branch 2 patch on 2.7 is no longer blocked.

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