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https://issues.apache.org/jira/browse/MESOS-8732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442279#comment-16442279
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Andrei Budnik commented on MESOS-8732:
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After setting composing c'zer by default, some tests (e.g.
`AgentAPITest.AttachContainerInputValidation`) started to hang due to a paused
clocks and the use of clock-dependant methods, like `await()`, `delay()`, etc.
by the docker library.
It hangs in
[`Docker::validateVersion()`|https://github.com/apache/mesos/blob/ca21ca82071f2c53d5817424569977728260da65/src/docker/docker.cpp#L24],
which is called from
[`Docker::create()`|https://github.com/apache/mesos/blob/ca21ca82071f2c53d5817424569977728260da65/src/docker/docker.cpp#L145].
After I added `Clock::resume()` before calling
`version.await(DOCKER_VERSION_WAIT_TIMEOUT)`, tests have started to hang due to
the hanging docker recovery: docker c'zer launches `docker ps -a` subprocess
and [subscribes for its
termination|https://github.com/apache/mesos/blob/ca21ca82071f2c53d5817424569977728260da65/src/docker/docker.cpp#L1466-L1467].
As a reaper process [uses
`delay()`|https://github.com/apache/mesos/blob/master/3rdparty/libprocess/src/reap.cpp#L112],
this leads to a hanging recovery process for the docker c'zer.
> Use composing containerizer by default in tests.
> ------------------------------------------------
>
> Key: MESOS-8732
> URL: https://issues.apache.org/jira/browse/MESOS-8732
> Project: Mesos
> Issue Type: Task
> Components: containerization
> Reporter: Andrei Budnik
> Priority: Major
> Labels: containerizer, mesosphere, tests
>
> If we assign "docker,mesos" to the `containerizers` flag for an agent, then
> `ComposingContainerizer` will be used for many tests that do not specify
> `containerizers` flag. That's the goal of this task.
> I tried to do that by adding [`flags.containerizers =
> "docker,mesos";`|https://github.com/apache/mesos/blob/master/src/tests/mesos.cpp#L273],
> but it turned out that some tests are started to hang due to a paused
> clocks, while docker c'zer and docker library use libprocess clocks.
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