imay commented on issue #242: Poor query performance under high concurrence URL: https://github.com/apache/incubator-doris/issues/242#issuecomment-429791746 > > According to query profile, I see DataStreamSender use most time. > > For Instance a37b604526e49e4:8cc515f4acd8773c, DataStreamSender use 7s180ms and OLAP_SCAN_NODE just use 117.305ms。 > > so there may be some problem in DataStreamSender > > What's the version of Doris you test > > I also doubted the DataStreamSender, but didn't find a powerful way to prove which is DataStreamSender itself has a problem. I think maybe the DataStreamRecvr is slow. Doris has change internal data RPC to brpc in [a69ac65760db228df487f148a643090f2036698f](https://github.com/apache/incubator-doris/commit/a69ac65760db228df487f148a643090f2036698f) commit, you can use this version to test again
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