Changes to only catch IllegalArgumentException

Author: avarredd

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/AbstractDelegationTokenSecretManager.java

@@ -860,7 +860,7 @@ private void removeExpiredToken() throws IOException {
           expiredTokens.add(entry.getKey());
           try {
             removeTokenForOwnerStats(entry.getKey());
-          } catch (Exception e) {
+          } catch (IllegalArgumentException e) {
             LOG.warn("Ignoring the exception in removeTokenForOwnerStats to remove expired " +
                     "delegation tokens from cache and proceeding to remove", e);
           }