I was trying to use difflib.SequenceMatcher in Python to return the largest common string
string1="""ERROR agave_util.py:64 Timed out waiting for HA alert generated CRITICAL ha_test_util.py:44 HA alert generated, Stack:File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 909, in <module> main(FLAGS, sync_state) File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 878, in main worker.run(sync_state) File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 326, in run if not self.__test_phase_wrapper(test_method): File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 502, in __test_phase_wrapper func() File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 87, in test_stargate_master_power_off self._host_power_off_test_cycle(host_of_stargate_master) File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 27, in _host_power_off_test_cycle self.ha_util.power_off_and_check_ha(host) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 469, in power_off_and_check_ha self.wait_for_ha_alert(cutoff_usecs=latest_alert_start, **kwargs) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 418, in wait_for_ha_alert interval=interval, File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 44, in wait_for_true CHECK(result, message) ERROR nutanix_test_runner_worker.py:595 Test failed: 1exc_type: <type 'exceptions.SystemExit'>exc_value: 1stack: File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 502, in __test_phase_wrapper func() File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 87, in test_stargate_master_power_off self._host_power_off_test_cycle(host_of_stargate_master) File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 27, in _host_power_off_test_cycle self.ha_util.power_off_and_check_ha(host) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 469, in power_off_and_check_ha self.wait_for_ha_alert(cutoff_usecs=latest_alert_start, **kwargs) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 418, in wait_for_ha_alert interval=interval, File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 44, in wait_for_true CHECK(result, message) File "/main/.python/util/base/log.py", line 204, in CHECK FATAL(log_msg, **kwargs) File "/main/.python/util/base/log.py", line 185, in FATAL sys.exit(1) ERROR nutanix_test.py:696 Failed to get gflags from 10.5.132.157. ERROR nutanix_test.py:696 Failed to get gflags from 10.5.132.157. ERROR nutanix_test.py:1699 Failed to save cluster configuration"""
string2="""ERROR agave_util.py:64 Timed out waiting for VMs [u'vm_353ca5', u'vm_e02d7f'] power on CRITICAL ha_test_util.py:44 VMs [u'vm_353ca5', u'vm_e02d7f'] power on, Stack:File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 909, in <module> main(FLAGS, sync_state) File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 878, in main worker.run(sync_state) File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 326, in run if not self.__test_phase_wrapper(test_method): File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 502, in __test_phase_wrapper func() File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 67, in test_zoo_keeper_leader_power_off self._host_power_off_test_cycle(leader_host) File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 27, in _host_power_off_test_cycle self.ha_util.power_off_and_check_ha(host) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 468, in power_off_and_check_ha self.verify_vms_not_on_host(host_vms, host) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 617, in verify_vms_not_on_host self.wait_for_vms_power_on(vm_names, per_vm_timeout) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 599, in wait_for_vms_power_on interval=15) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 44, in wait_for_true CHECK(result, message) ERROR nutanix_test_runner_worker.py:595 Test failed: 1exc_type: <type 'exceptions.SystemExit'>exc_value: 1stack: File "/main/qa/py/qa/agave/nutanix_test_runner_worker.py", line 502, in __test_phase_wrapper func() File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 67, in test_zoo_keeper_leader_power_off self._host_power_off_test_cycle(leader_host) File "/main/qa/test/agave/acropolis_tests/ha/best_effort_power_off_test.py", line 27, in _host_power_off_test_cycle self.ha_util.power_off_and_check_ha(host) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 468, in power_off_and_check_ha self.verify_vms_not_on_host(host_vms, host) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 617, in verify_vms_not_on_host self.wait_for_vms_power_on(vm_names, per_vm_timeout) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 599, in wait_for_vms_power_on interval=15) File "/main/.python/qa/util/agave_tools/ha_test_util.py", line 44, in wait_for_true CHECK(result, message) File "/main/.python/util/base/log.py", line 204, in CHECK FATAL(log_msg, **kwargs) File "/main/.python/util/base/log.py", line 185, in FATAL sys.exit(1) ERROR nutanix_test.py:696 Failed to get gflags from 10.5.132.156. ERROR nutanix_test.py:696 Failed to get gflags from 10.5.132.156. ERROR nutanix_test.py:1699 Failed to save cluster configuration"""
match = SequenceMatcher(None, string1, string2).find_longest_match(0, len(string1), 0, len(string2))
print match
print(string1[match.a: match.a + match.size])
string1="""ERROR agave_util.py:64 Timed out waiting for HA alert generated CRITICAL ha_test_util.py:44,"""
string2="""ERROR agave_util.py:64 Timed out waiting for VMs [u'vm_353ca5', u'vm_e02d7f'] power on CRITICAL ha_test_util.py:44"""
match = SequenceMatcher(None, string1, string2).find_longest_match(0, len(string1), 0, len(string2))
print(string1[match.a: match.a + match.size])
So basically during comparison of string1 and string2 [first two lines] returns CRITICAL ha_test_util.py:44,
while when I cut some lines from string1 and string2 [lines 6 and 7], it returned ERROR agave_util.py:64 Timed out waiting for
Basically my question is why sequence matcher didn't return the proper match during my first case?