surahman commented on issue #3733:
URL: 
https://github.com/apache/incubator-heron/issues/3733#issuecomment-967728423


   I have isolated the issue to the exact same one in each of the tests:
   
   ```java
   while (dummy_stmgr->NumStartBPMsgs() == 0) sleep(1);
   ```
   
   The associated code snippets for each test:
   
   
https://github.com/apache/incubator-heron/blob/c32c09a0f09caca74dbf5715aa0632f0a50356c9/heron/stmgr/tests/cpp/server/stmgr_unittest.cpp#L1030-L1031
   
https://github.com/apache/incubator-heron/blob/c32c09a0f09caca74dbf5715aa0632f0a50356c9/heron/stmgr/tests/cpp/server/stmgr_unittest.cpp#L1140-L1141
   
https://github.com/apache/incubator-heron/blob/c32c09a0f09caca74dbf5715aa0632f0a50356c9/heron/stmgr/tests/cpp/server/stmgr_unittest.cpp#L1397-L1398
   
   The tests all hang in a busy-wait loop waiting for back pressure build-up.


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