[GitHub] jiangxinlingdu commented on issue #543: When first Store message mappedFile is null ，Concurrency create will more one mappedFile

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jiangxinlingdu commented on issue #543: When first Store message mappedFile is null ，Concurrency create will more one mappedFile
URL: https://github.com/apache/rocketmq/pull/543#issuecomment-439261658
 
 
   > @jiangxinlingdu The code is better in the lock. But currently, the following code:
   > `if (null == mappedFile || mappedFile.isFull()) { mappedFile = this.mappedFileQueue.getLastMappedFile(0); // Mark: NewFile may be cause noise }`
   > will prevent creating duplicated mapped file. So it has no defects finally.
   
   ok

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