lokeshj1703 commented on a change in pull request #1072: HDDS-1766. 
ContainerStateMachine is unable to increment lastAppliedTermIndex. Contributed 
by  Mukul Kumar Singh.
URL: https://github.com/apache/hadoop/pull/1072#discussion_r302098470
 
 

 ##########
 File path: 
hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/transport/server/ratis/ContainerStateMachine.java
 ##########
 @@ -554,12 +556,12 @@ private ByteString getCachedStateMachineData(Long 
logIndex, long term,
       }
     } catch (Exception e) {
       metrics.incNumReadStateMachineFails();
-      LOG.error("unable to read stateMachineData:" + e);
+      LOG.error("{} unable to read stateMachineData:", gid, e);
       return completeExceptionally(e);
     }
   }
 
-  private void updateLastApplied() {
+  private synchronized void updateLastApplied() {
 
 Review comment:
   @mukul1987  Thanks for working on this! The patch looks good to me.
   I think we can avoid using synchronized by using a concurrent sorted map. 
Each applyTransaction removes its corresponding entry from the map and we 
update lastApplied based on the first entry in the map?

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