Flaky test: TestImpalaShellInteractive::test_multiline_queries_in_history

03:24:52 FAIL shell/test_shell_interactive.py::TestImpalaShellInteractive::()::test_multiline_queries_in_history
03:24:52 =================================== FAILURES ===================================
03:24:52 _________ TestImpalaShellInteractive.test_multiline_queries_in_history _________
03:24:52 shell/test_shell_interactive.py:224: in test_multiline_queries_in_history
03:24:52     child_proc.expect(prompt_regex)
03:24:52 ../infra/python/env/lib/python2.6/site-packages/pexpect/__init__.py:1451: in expect
03:24:52     timeout, searchwindowsize)
03:24:52 ../infra/python/env/lib/python2.6/site-packages/pexpect/__init__.py:1466: in expect_list
03:24:52     timeout, searchwindowsize)
03:24:52 ../infra/python/env/lib/python2.6/site-packages/pexpect/__init__.py:1568: in expect_loop
03:24:52     raise TIMEOUT(str(err) + '\n' + str(self))
03:24:52 E   TIMEOUT: Timeout exceeded.
03:24:52 E   <pexpect.spawn object at 0xcc6d950>
03:24:52 E   version: 3.3
03:24:52 E   command: /data/jenkins/workspace/impala-asf-2.x-exhaustive/repos/Impala/bin/impala-shell.sh
03:24:52 E   args: ['/data/jenkins/workspace/impala-asf-2.x-exhaustive/repos/Impala/bin/impala-shell.sh']
03:24:52 E   searcher: <pexpect.searcher_re object at 0xcc6d9d0>
03:24:52 E   buffer (last 100 chars): 'select\r\n                              > 1--comment;\r\n                              > '
03:24:52 E   before (last 100 chars): 'select\r\n                              > 1--comment;\r\n                              > '
03:24:52 E   after: <class 'pexpect.TIMEOUT'>
03:24:52 E   match: None
03:24:52 E   match_index: None
03:24:52 E   exitstatus: None
03:24:52 E   flag_eof: False
03:24:52 E   pid: 3377
03:24:52 E   child_fd: 10
03:24:52 E   closed: False
03:24:52 E   timeout: 30
03:24:52 E   delimiter: <class 'pexpect.EOF'>
03:24:52 E   logfile: None
03:24:52 E   logfile_read: None
03:24:52 E   logfile_send: None
03:24:52 E   maxread: 2000
03:24:52 E   ignorecase: False
03:24:52 E   searchwindowsize: None
03:24:52 E   delaybeforesend: 0.05
03:24:52 E   delayafterclose: 0.1
03:24:52 E   delayafterterminate: 0.1