YARN-8054. Improve robustness of the LocalDirsHandlerService MonitoringTimerTask thread. Contributed by Jonathan Eagles

(cherry picked from commit 5aa7052e319c3273243dda9993fb6c2d776eb7cc)
(cherry picked from commit 5d4b2c31a19b2ce7d94a9ca12ed6a1def428bb83)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LocalDirsHandlerService.java

@@ -166,7 +166,12 @@ public class LocalDirsHandlerService extends AbstractService {
 
     @Override
     public void run() {
-      checkDirs();
+      try {
+        checkDirs();
+      } catch (Throwable t) {
+        // Prevent uncaught exceptions from killing this thread
+        LOG.warn("Error while checking local directories: ", t);
+      }
     }
   }