chandrasekhar-188k commented on code in PR #6768:
URL: https://github.com/apache/hbase/pull/6768#discussion_r1997876120


##########
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java:
##########
@@ -3191,13 +3192,28 @@ private RegionScannerImpl getScanner(Scan scan, 
List<KeyValueScanner> additional
             checkFamily(family);
           }
         }
-        return instantiateRegionScanner(scan, additionalScanners, nonceGroup, 
nonce);
+
+        regionScanner = instantiateRegionScanner(scan, additionalScanners, 
nonceGroup, nonce);
+        return regionScanner;
       } finally {
-        closeRegionOperation(Operation.SCAN);
+        // close region operation can throw an exception, in that case the 
scanner never gets
+        // closed.
+        try {
+          closeRegionOperation(Operation.SCAN);
+        } catch (Throwable t) {
+          throw handleException(t, regionScanner);
+        }
       }
     }, () -> createRegionSpan("Region.getScanner"));
   }
 
+  private static IOException handleException(Throwable t, RegionScannerImpl 
regionScanner) {
+    if (null != regionScanner) {
+      regionScanner.close();
+    }
+    return t instanceof IOException ? (IOException) t : new IOException(t);

Review Comment:
   I have updated the code accordingly



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