HBASE-25166 MobFileCompactionChore is closing the master's shared clu…

…ster connection (apache#2514) (apache#4826)

Co-authored-by: Ankit Singhal <ankit@apache.org>
Signed-off-by: Xiaolin Ha <haxiaolin@apache.org>
(cherry picked from commit 66873ca)

hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobFileCompactionChore.java

@@ -31,7 +31,6 @@
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
 import org.apache.hadoop.hbase.client.CompactionState;
-import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.RegionInfo;
 import org.apache.hadoop.hbase.client.TableDescriptor;
 import org.apache.hadoop.hbase.client.TableState;
@@ -81,8 +80,7 @@ protected void chore() {
 
     boolean reported = false;
 
-    try (Connection conn = master.getConnection(); Admin admin = conn.getAdmin();) {
-
+    try (Admin admin = master.getConnection().getAdmin()) {
       TableDescriptors htds = master.getTableDescriptors();
       Map<String, TableDescriptor> map = htds.getAll();
       for (TableDescriptor htd : map.values()) {