diff --git a/client/src/main/java/org/apache/rocketmq/client/impl/consumer/DefaultLitePullConsumerImpl.java b/client/src/main/java/org/apache/rocketmq/client/impl/consumer/DefaultLitePullConsumerImpl.java
index 4e139c44ce0c25d0eee8b01bc2f87804a036c8b9..e835be1cd5202ce42eb970e42468e1a2524baac1 100644
--- a/client/src/main/java/org/apache/rocketmq/client/impl/consumer/DefaultLitePullConsumerImpl.java
+++ b/client/src/main/java/org/apache/rocketmq/client/impl/consumer/DefaultLitePullConsumerImpl.java
@@ -100,7 +100,7 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
 
     private static final String NOT_RUNNING_EXCEPTION_MESSAGE = "The consumer not running, please start it first.";
 
-    private static final String SUBSCRIPTION_CONFILCT_EXCEPTION_MESSAGE = "Subscribe and assign are mutually exclusive.";
+    private static final String SUBSCRIPTION_CONFLICT_EXCEPTION_MESSAGE = "Subscribe and assign are mutually exclusive.";
     /**
      * the type of subscription
      */
@@ -195,8 +195,9 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
     }
 
     private void checkServiceState() {
-        if (this.serviceState != ServiceState.RUNNING)
+        if (this.serviceState != ServiceState.RUNNING) {
             throw new IllegalStateException(NOT_RUNNING_EXCEPTION_MESSAGE);
+        }
     }
 
     public void updateNameServerAddr(String newAddresses) {
@@ -204,10 +205,11 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
     }
 
     private synchronized void setSubscriptionType(SubscriptionType type) {
-        if (this.subscriptionType == SubscriptionType.NONE)
+        if (this.subscriptionType == SubscriptionType.NONE) {
             this.subscriptionType = type;
-        else if (this.subscriptionType != type)
-            throw new IllegalStateException(SUBSCRIPTION_CONFILCT_EXCEPTION_MESSAGE);
+        } else if (this.subscriptionType != type) {
+            throw new IllegalStateException(SUBSCRIPTION_CONFLICT_EXCEPTION_MESSAGE);
+        }
     }
 
     private void updateAssignedMessageQueue(String topic, Set<MessageQueue> assignedMessageQueue) {
@@ -464,7 +466,7 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
 
     public synchronized void subscribe(String topic, String subExpression) throws MQClientException {
         try {
-            if (topic == null || topic.equals("")) {
+            if (topic == null || "".equals(topic)) {
                 throw new IllegalArgumentException("Topic can not be null or empty.");
             }
             setSubscriptionType(SubscriptionType.SUBSCRIBE);
@@ -483,7 +485,7 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
 
     public synchronized void subscribe(String topic, MessageSelector messageSelector) throws MQClientException {
         try {
-            if (topic == null || topic.equals("")) {
+            if (topic == null || "".equals(topic)) {
                 throw new IllegalArgumentException("Topic can not be null or empty.");
             }
             setSubscriptionType(SubscriptionType.SUBSCRIBE);
@@ -533,8 +535,9 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
     public synchronized List<MessageExt> poll(long timeout) {
         try {
             checkServiceState();
-            if (timeout < 0)
+            if (timeout < 0) {
                 throw new IllegalArgumentException("Timeout must not be negative");
+            }
 
             if (defaultLitePullConsumer.isAutoCommit()) {
                 maybeAutoCommit();
@@ -546,8 +549,9 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
             if (endTime - System.currentTimeMillis() > 0) {
                 while (consumeRequest != null && consumeRequest.getProcessQueue().isDropped()) {
                     consumeRequest = consumeRequestCache.poll(endTime - System.currentTimeMillis(), TimeUnit.MILLISECONDS);
-                    if (endTime - System.currentTimeMillis() <= 0)
+                    if (endTime - System.currentTimeMillis() <= 0) {
                         break;
+                    }
                 }
             }
 
@@ -671,8 +675,9 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
     public long committed(MessageQueue messageQueue) throws MQClientException {
         checkServiceState();
         long offset = this.offsetStore.readOffset(messageQueue, ReadOffsetType.MEMORY_FIRST_THEN_STORE);
-        if (offset == -2)
+        if (offset == -2) {
             throw new MQClientException("Fetch consume offset from broker exception", null);
+        }
         return offset;
     }
 
@@ -683,8 +688,9 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
         }
         Iterator<ConsumeRequest> iter = consumeRequestCache.iterator();
         while (iter.hasNext()) {
-            if (iter.next().getMessageQueue().equals(messageQueue))
+            if (iter.next().getMessageQueue().equals(messageQueue)) {
                 iter.remove();
+            }
         }
     }
 
@@ -735,10 +741,11 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
                     return;
                 }
 
-                if (consumeRequestCache.size() * defaultLitePullConsumer.getPullBatchSize() > defaultLitePullConsumer.getPullThresholdForAll()) {
+                if ((long) consumeRequestCache.size() * defaultLitePullConsumer.getPullBatchSize() > defaultLitePullConsumer.getPullThresholdForAll()) {
                     scheduledThreadPoolExecutor.schedule(this, PULL_TIME_DELAY_MILLS_WHEN_FLOW_CONTROL, TimeUnit.MILLISECONDS);
-                    if ((consumeRequestFlowControlTimes++ % 1000) == 0)
+                    if ((consumeRequestFlowControlTimes++ % 1000) == 0) {
                         log.warn("The consume request count exceeds threshold {}, so do flow control, consume request count={}, flowControlTimes={}", consumeRequestCache.size(), consumeRequestFlowControlTimes);
+                    }
                     return;
                 }
 
@@ -790,11 +797,10 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
                 long pullDelayTimeMills = 0;
                 try {
                     SubscriptionData subscriptionData;
+                    String topic = this.messageQueue.getTopic();
                     if (subscriptionType == SubscriptionType.SUBSCRIBE) {
-                        String topic = this.messageQueue.getTopic();
                         subscriptionData = rebalanceImpl.getSubscriptionInner().get(topic);
                     } else {
-                        String topic = this.messageQueue.getTopic();
                         subscriptionData = FilterAPI.buildSubscriptionData(topic, SubscriptionData.SUB_ALL);
                     }