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https://issues.apache.org/jira/browse/YARN-11290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601509#comment-17601509
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ASF GitHub Bot commented on YARN-11290:
---------------------------------------

slfan1989 commented on code in PR #4846:
URL: https://github.com/apache/hadoop/pull/4846#discussion_r965313622


##########
hadoop-yarn-project/hadoop-yarn/bin/FederationStateStore/MySQL/FederationStateStoreStoredProcs.sql:
##########
@@ -122,10 +122,17 @@ BEGIN
    WHERE applicationId = applicationID_IN;
 END //
 
-CREATE PROCEDURE sp_getApplicationsHomeSubCluster()
-BEGIN
-   SELECT applicationId, homeSubCluster
-   FROM applicationsHomeSubCluster;
+CREATE PROCEDURE sp_getApplicationsHomeSubCluster(IN limit_IN int, IN 
homeSubCluster_IN varchar(256))
+BEGIN
+   SET @row_num = 0;
+   SELECT
+       applicationId, homeSubCluster
+   FROM (SELECT
+         applicationId, homeSubCluster,  (@rownum := @rownum + 1) AS row_num
+        FROM applicationsHomeSubCluster) AS t
+        WHERE row_num <= limit_IN

Review Comment:
   Thank you very much for your suggestion, we should sort the apps and get the 
topN apps, I will modify the code.





> Improve Query Condition of FederationStateStore#getApplicationsHomeSubCluster
> -----------------------------------------------------------------------------
>
>                 Key: YARN-11290
>                 URL: https://issues.apache.org/jira/browse/YARN-11290
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: federation
>    Affects Versions: 3.4.0
>            Reporter: fanshilun
>            Assignee: fanshilun
>            Priority: Minor
>              Labels: pull-request-available
>         Attachments: SqlServer-StoredProc.png
>
>
> 1. Currently this interface returns the number of apps in all sub-clusters, 
> increasing the limit on the number of query apps, limited to 1000 apps.
> 2. Allows to query the App based on the specified HomeSubCluster.



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