Jason918 commented on issue #220: [ROCKETMQ-332] MappedFileQueue#findMappedFileByOffset is not thread safe, which will cause message loss. URL: https://github.com/apache/rocketmq/pull/220#issuecomment-358591394 @vongosling As mappedFiles is an instance of CopyOnWriteArrayList, a snapshot of this array is used in the iterate step.
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