slfan1989 commented on code in PR #4846:
URL: https://github.com/apache/hadoop/pull/4846#discussion_r969998465
##########
hadoop-yarn-project/hadoop-yarn/bin/FederationStateStore/MySQL/FederationStateStoreStoredProcs.sql:
##########
@@ -122,10 +122,26 @@ 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
+ SELECT
+ applicationId,
+ homeSubCluster,
+ createTime
+ FROM
+ (SELECT
+ applicationId,
+ homeSubCluster,
+ createTime,
+ @app_rank := IF(@home_sc = homeSubCluster, @app_rank + 1, 1) AS
app_rank,
+ @home_sc := homeSubCluster
+ FROM applicationshomesubcluster
+ ORDER BY createTime DESC
+ ) ranked
+ WHERE app_rank <= limit_IN
+ AND (CASE WHEN t.homeSubCluster_IN IS NULL THEN 1 = 1
Review Comment:
For MySQL, I also tried to refactor this SQL using a simpler way of writing.
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