`proxy.connection` failed occasionally

[empiredan]

While running release tests for pegasus_rproxy_test, proxy.connection failed occasionally:

[ RUN      ] proxy.connection
/__w/incubator-pegasus/incubator-pegasus/src/redis_protocol/proxy_ut/redis_proxy_test.cpp:570: Failure
Expected equality of these values:
  resp
    Which is: "$4\r\nbar3\r\n"
  got_reply
    Which is: "$4\r\nbar2\r\n"
With diff:
@@ -1,2 +1,2 @@
 $4\r
-bar3\r\n
+bar2\r\n


[  FAILED  ] proxy.connection (15 ms)