Intermittent C++ test failure in LatchTest.testTimedWait

[merlimat]

As seen on https://builds.apache.org/job/pulsar-pull-request/45/console

[35/75] LatchTest.testTimedWait (108 ms)
log4cxx: Could not read configuration file [log4cxx.conf].
�[0;33mNote: Google Test filter = LatchTest.testTimedWait
�[m�[0;32m[==========] �[mRunning 1 test from 1 test case.
�[0;32m[----------] �[mGlobal test environment set-up.
�[0;32m[----------] �[m1 test from LatchTest
�[0;32m[ RUN      ] �[mLatchTest.testTimedWait
log4cxx: No appender could be found for logger (pulsar./pulsar/pulsar-client-cpp/tests/LatchTest.cc).
log4cxx: Please initialize the log4cxx system properly.
/pulsar/pulsar-client-cpp/tests/LatchTest.cc:80: Failure
Value of: latch1.wait(millisec(70))
  Actual: false
Expected: true
�[0;31m[  FAILED  ] �[mLatchTest.testTimedWait (74 ms)
�[0;32m[----------] �[m1 test from LatchTest (74 ms total)

�[0;32m[----------] �[mGlobal test environment tear-down
�[0;32m[==========] �[m1 test from 1 test case ran. (74 ms total)
�[0;32m[  PASSED  ] �[m0 tests.
�[0;31m[  FAILED  ] �[m1 test, listed below:
�[0;31m[  FAILED  ] �[mLatchTest.testTimedWait

cc @jai1

[jai1]

The test is correct, the only reason it would fail if:-
a. #CPU threads < 4
b. IO operation (LOG_INFO) is taking too long

All I can do is either increase the timeout at
https://github.com/apache/incubator-pulsar/blob/master/pulsar-client-cpp/tests/LatchTest.cc?utf8=%E2%9C%93#L80
OR
remove the LOG_INFO line
https://github.com/apache/incubator-pulsar/blob/master/pulsar-client-cpp/tests/LatchTest.cc?utf8=%E2%9C%93#L47