dongeforever 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-439260539 @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.
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