jiangxinlingdu commented 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-439264225 > If the switch "transientStorePoolEnable" is on && the flushType equals "ASYNC_FLUSH" && broker is master && transientStorePool buffer is enough, broker will create two mappedFiles. For more information, you can see "AllocateMappedFileService#putRequestAndReturnMappedFile". i see
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