Ah39 edited a comment on issue #688: MappedFileQueue load may cause the large file blank URL: https://github.com/apache/rocketmq/issues/688#issuecomment-457042292 > 如果每个topic的consume queue都保存offset的话, 那么1万个topic,每个topic假设4个队列,那么需要至少4万个long, 那么这部分的写肯定是随机写了，这样有可能会影响性能，并且现在的正常情况下扫描文件，大部分情况是为了预热,当然也有文件校验的设计在里面。 4 0000 long write a file , sync periodic to file dont have a problem. like consumer offset . Other , kafka every partition have a checkpoint offset ( A file name recovery-point-offset-checkpoint ) Also , if 10000 topic , if need scan log file ,restart broker cost how mush time ? 10 minute ? even more ??
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