ChenSammi commented on code in PR #6803:
URL: https://github.com/apache/hadoop/pull/6803#discussion_r1594856131


##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/AbstractDelegationTokenSecretManager.java:
##########
@@ -169,21 +172,29 @@ public AbstractDelegationTokenSecretManager(long 
delegationKeyUpdateInterval,
   public void startThreads() throws IOException {
     Preconditions.checkState(!running);
     updateCurrentKey();
-    synchronized (this) {
+    this.apiLock.writeLock().lock();
+    try {
       running = true;
       tokenRemoverThread = new Daemon(new ExpiredTokenRemover());
       tokenRemoverThread.start();
+    }finally {

Review Comment:
   There need be a blank between "}" and finally.  Kindly check other "finally" 
statement. 
   
   Also please check the checkstyle issues reported by the CI,  
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6803/2/artifact/out/results-checkstyle-hadoop-common-project_hadoop-common.txt.
 



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