anujphadke has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/11540


Change subject: [WIP] IMPALA-7555: Impala-shell should timeout if it fails to 
connect
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[WIP] IMPALA-7555: Impala-shell should timeout if it fails to connect

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 1 min.
Usage: impala-shell --client_connect_timeout=<value in ms>

Testing:
1. Added a test where I create a random listening socket.
impala-shell connects to this socket and times out after the default
timeout value.
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 1 min.I verified it manually.

Change-Id: I130fc47f7a83f591918d6842634b4e5787d00813
---
M shell/impala_client.py
M shell/impala_shell.py
M shell/impala_shell_config_defaults.py
M shell/option_parser.py
M tests/shell/test_shell_commandline.py
5 files changed, 33 insertions(+), 9 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/40/11540/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I130fc47f7a83f591918d6842634b4e5787d00813
Gerrit-Change-Number: 11540
Gerrit-PatchSet: 1
Gerrit-Owner: anujphadke <apha...@cloudera.com>

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