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f672c315bc
This change reduces to following command from 8.5s to 1.5s on my machine: shell/impala_shell.py -B -q "select * from tpch_parquet.lineitem limit 100000;" --protocol hs2-http > /dev/null This nearly eliminates the speed difference between hs2 and hs2-http. The root cause of the original slowness is the large number of calls to socket.recv(). The query above used to call it 2809090 times, now it is only 9007. Testing: - ran shell tests Change-Id: If11f287be65b10bee2b0afffea118e3dc70fdbbd Reviewed-on: http://gerrit.cloudera.org:8080/17346 Reviewed-by: Quanlong Huang <huangquanlong@gmail.com> Tested-by: Csaba Ringhofer <csringhofer@cloudera.com>