HBASE-22302 Fix TestHbck

Author: Apache9

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestHbck.java

@@ -29,7 +29,6 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
-
 import org.apache.hadoop.hbase.Coprocessor;
 import org.apache.hadoop.hbase.CoprocessorEnvironment;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
@@ -273,7 +272,8 @@ public void testRecoverSplitAfterMetaUpdated() throws Exception {
     FailingSplitAfterMetaUpdatedMasterObserver observer = master.getMasterCoprocessorHost()
         .findCoprocessor(FailingSplitAfterMetaUpdatedMasterObserver.class);
     assertNotNull(observer);
-    try (Admin admin = TEST_UTIL.getConnection().getAdmin()) {
+    try {
+      AsyncAdmin admin = TEST_UTIL.getAsyncConnection().getAdmin();
       byte[] splitKey = Bytes.toBytes("bcd");
       admin.split(TableName.valueOf(testTable), splitKey);
       observer.latch.await(5000, TimeUnit.MILLISECONDS);