surahman opened a new issue #3733:
URL: https://github.com/apache/incubator-heron/issues/3733
**Describe the bug**
The `stmgr_unittest` is consistently causing failures with timeouts during
the CI or when running tests with fewer execution threads available.
**To Reproduce**
Steps to reproduce the behaviour:
1. Trigger the TravisCI pipeline.
or
1. Run in an environment with only 4 or fewer cores available (no H/T).
2. Build in a Ubuntu Docker container using the provided build script.
This will not occur if you have more cores and threads at your disposal to
run the tests.
**Expected behavior**
Ideally: a passing `stmgr_unittest`.
**Isolated Issue**
The following three tests in the test suite are causing the problems.
Disabling them alleviates the problem. It is my belief that this is the result
of a deadlock or livelock situation but I am investigating further to confirm
the exact source of the problem.
https://github.com/apache/incubator-heron/blob/c32c09a0f09caca74dbf5715aa0632f0a50356c9/heron/stmgr/tests/cpp/server/stmgr_unittest.cpp#L960-L1068
https://github.com/apache/incubator-heron/blob/c32c09a0f09caca74dbf5715aa0632f0a50356c9/heron/stmgr/tests/cpp/server/stmgr_unittest.cpp#L1071-L1205
https://github.com/apache/incubator-heron/blob/c32c09a0f09caca74dbf5715aa0632f0a50356c9/heron/stmgr/tests/cpp/server/stmgr_unittest.cpp#L1328-L1441
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