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impala-shell does not set any socket timeout while connecting to the impala server. This change sets a timeout on the socket before connecting and unsets it back after successfully connecting. The default timeout on this socket is 5 sec. Usage: impala-shell --client_connect_timeout=<value in ms> Testing: 1. Added a test where I create a random listening socket. impala-shell (with ssl enabled) connects to this socket and times out after 2 sec. 2. Created a kerberized impala cluster with ssl enabled and connected to the impalad using an openssl client (block the beeswax server thread to accept new connection) - E.g. - openssl s_client -connect <IP Addr>:21000 Used impala-shell to connect to the same impalad later. impala-shell timed out after the default of 5 sec.I verified it manually. Change-Id: I130fc47f7a83f591918d6842634b4e5787d00813 Reviewed-on: http://gerrit.cloudera.org:8080/11540 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>