jiangxinlingdu opened a new issue #541: broker在存储数据并发问题 URL: https://github.com/apache/rocketmq/issues/541 在CommitLog类中，putMessage的时候， MappedFile mappedFile = this.mappedFileQueue.getLastMappedFile(); 之后在putMessageLock.lock();在 if (null == mappedFile || mappedFile.isFull()) { mappedFile = this.mappedFileQueue.getLastMappedFile(0); // Mark: NewFile may be cause noise } 如果有多个同时取到mappedFile 为null之后进入lock之后会创建2个MappedFile 详情看：https://github.com/apache/rocketmq/pull/540
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