HDFS-7871. NameNodeEditLogRoller can keep printing 'Swallowing exception' message. Contributed by Jing Zhao.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1071,6 +1071,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7785. Improve diagnostics information for HttpPutFailedException.
     (Chengbing Liu via wheat9)
 
+    HDFS-7871. NameNodeEditLogRoller can keep printing "Swallowing exception"
+    message. (jing9)
+
     BREAKDOWN OF HDFS-7584 SUBTASKS AND RELATED JIRAS
 
       HDFS-7720. Quota by Storage Type API, tools and ClientNameNode

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -4558,14 +4558,16 @@ public void run() {
                 + rollThreshold);
             rollEditLog();
           }
+        } catch (Exception e) {
+          FSNamesystem.LOG.error("Swallowing exception in "
+              + NameNodeEditLogRoller.class.getSimpleName() + ":", e);
+        }
+        try {
           Thread.sleep(sleepIntervalMs);
         } catch (InterruptedException e) {
           FSNamesystem.LOG.info(NameNodeEditLogRoller.class.getSimpleName()
               + " was interrupted, exiting");
           break;
-        } catch (Exception e) {
-          FSNamesystem.LOG.error("Swallowing exception in "
-              + NameNodeEditLogRoller.class.getSimpleName() + ":", e);
         }
       }
     }