ymwneu edited a comment on issue #542: When first Store message mappedFile is null ，Concurrency create will more one mappedFile URL: https://github.com/apache/rocketmq/issues/542#issuecomment-439263326 Under normal circumstances, the broker will create two mappedFiles in advance. For more information, you can see "AllocateMappedFileService#putRequestAndReturnMappedFile".
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