Since yesterday some tests started to hang - most frequently TestCrudCompactorOnTez or TestMmCompactorOnTez but I've seen a replication test as well - so I don't think its
limited to those 2 tests.
I was not able to figure out what have caused this - my current guess is that
somehow the tez 0.9.2 upgrade have caused it.
To validate this guess I've started the flaky checker with and without that
patch from the current state...
I've collected some jstacks from the containers running for more than 20 hours