Cicizz commented on issue #614: How much memory should we use for broker and namesrv when using cluster mode? URL: https://github.com/apache/rocketmq/issues/614#issuecomment-448520476 @hepyu 1.the namesrv just save broker and topic info, I think they cost memory little, is 16G is too large? I think even 8G is also too large, is this right? it depends on your topics, 8g is OK.but 2 namesrv is enough. 2.About lost message when only using master, is this happen only when master disk is wrong? I mean if we don't consider the disk broken, the rocketmq won't lose message, is this right? if you use async_flush,when broker crash and message hasn't flush to the disk,then the message lost. 3.If we use slave feature, is it will have some influences about the qps? And How big is the impact? yes ,but it can gurantee the message reliability 4.And what about the qps when using the config as you advice? 1.pub message: message size:2K and tps is 40000 2.consume message:messages size 2k and tps is 60000. message size affects TPS.
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