Andrei Budnik created MESOS-8826:
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Summary: Make `ReaperProcess` independent of pausing libprocess'
clocks
Key: MESOS-8826
URL: https://issues.apache.org/jira/browse/MESOS-8826
Project: Mesos
Issue Type: Task
Components: libprocess
Reporter: Andrei Budnik
After making composing containerizer as a default containerizer in tests by
setting a value `mesos,docker` for `containerizers` flag in
`MesosTest::CreateSlaveFlags()`, some tests started to endlessly wait for
recovery completion after starting slave with paused clocks.
Recovery process for a docker c'zer uses `subprocess()` to spawn `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, when the
libprocess' clocks are paused.
A possible [solution might
be|https://github.com/abudnik/mesos/commit/246958b8c942c150b2da778c8ab0f351be235992]
using a single dedicated thread that doesn't use libprocess clocks and
periodically iterates over pids and calls `waitpid` for each of them.
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