[GitHub] jiangxinlingdu opened a new pull request #543: When first Store message mappedFile is null ，Concurrency create will more one mappedFile

[GitBox]

jiangxinlingdu opened a new pull request #543: When first Store message 
mappedFile is null ，Concurrency create will more one mappedFile
URL: https://github.com/apache/rocketmq/pull/543
 
 
   ## What is the purpose of the change
   
   Fixes [#542](https://github.com/apache/rocketmq/issues/542)
   
   ## Brief changelog
   
   ```
    putMessageLock.lock(); //spin or ReentrantLock ,depending on store config
           try {
               MappedFile mappedFile = this.mappedFileQueue.getLastMappedFile();
   
               long beginLockTimestamp = 
this.defaultMessageStore.getSystemClock().now();
               this.beginTimeInLock = beginLockTimestamp;
   
               // Here settings are stored timestamp, in order to ensure an 
orderly
               // global
               msg.setStoreTimestamp(beginLockTimestamp);
   
               if (null == mappedFile || mappedFile.isFull()) {
                   mappedFile = this.mappedFileQueue.getLastMappedFile(0); // 
Mark: NewFile may be cause noise
               }
               if (null == mappedFile) {
                   log.error("create mapped file1 error, topic: " + 
msg.getTopic() + " clientAddr: " + msg.getBornHostString());
                   beginTimeInLock = 0;
                   return new 
PutMessageResult(PutMessageStatus.CREATE_MAPEDFILE_FAILED, null);
               }
   ```
   
   
   

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