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(Updated Sept. 18, 2016, 6:57 p.m.) Review request for mesos and Jie Yu. Changes ------- Updated testing done. Bugs: MESOS-6088 https://issues.apache.org/jira/browse/MESOS-6088 Repository: mesos Description ------- Previously the 'mesos-containerizer launch' binary would simply exec into the actual command we wanted to launch after doing some set of preperatory work. The problem with this approach, however, is that this gives us no opportunity to checkpoint the exit status of the command so the agent can recover it in cases where it is offline at the time the command completes. To compensate for this, we now allow 'mesos-containerizer launch' to take an optional '--wait_status_path' parameter, which indicates where to checkpint the status of the launched command (as returned by 'waitpid()'). In order to do this checkpointing, however, we cannot simply exec into the command anymore. Instead we now fork-exec the command and reap it once it completes. We then checkpoint its status and return it as our own. We call the original process the 'init' process of the container and the fork-exec'd process its child. As a side effect of doing things this way, we also have to be careful to forward all signals sent to the init process down to the child. In a subsequent commit we will update the mesos containerizer to use this new functionality. Diffs ----- src/slave/containerizer/mesos/launch.hpp 859990cb85e9e8c06400397256cfc512f0811800 src/slave/containerizer/mesos/launch.cpp fc51e04ec1572679e6a48ff4f0fa31ef2dfd6ec3 Diff: https://reviews.apache.org/r/51406/diff/ Testing (updated) ------- $ GTEST_FILTER="" make -j check $ src/mesos-tests $ sudo src/mesos-tests Thanks, Kevin Klues