HBASE-25967 The readRequestsCount does not calculate when the outResu… (#3351)

* HBASE-25967 The readRequestsCount does not calculate when the outResults is empty

Co-authored-by: Zheng Wang <wangzheng@apache.org>

Author: bsglz

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionScannerImpl.java

@@ -270,11 +270,9 @@ public boolean nextRaw(List<Cell> outResults, ScannerContext scannerContext) thr
       outResults.addAll(tmpList);
     }
 
-    if (!outResults.isEmpty()) {
-      region.addReadRequestsCount(1);
-      if (region.getMetrics() != null) {
-        region.getMetrics().updateReadRequestCount();
-      }
+    region.addReadRequestsCount(1);
+    if (region.getMetrics() != null) {
+      region.getMetrics().updateReadRequestCount();
     }
 
     // If the size limit was reached it means a partial Result is being returned. Returning a

hbase-server/src/test/java/org/apache/hadoop/hbase/master/assignment/TestTransitRegionStateProcedure.java

@@ -142,7 +142,9 @@ public void testRecoveryAndDoubleExecutionReopen() throws Exception {
     long openSeqNum2 = region2.getOpenSeqNum();
     // confirm that the region is successfully opened
     assertTrue(openSeqNum2 > openSeqNum);
-    assertEquals(1, region2.getReadRequestsCount());
+    // we check the available by scan after table created,
+    // so the readRequestsCount should be 2 here
+    assertEquals(2, region2.getReadRequestsCount());
     assertEquals(2, region2.getWriteRequestsCount());
   }