Zhitao Li created MESOS-7874:
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Summary: Provide a consistent non-blocking preLaunch hook
Key: MESOS-7874
URL: https://issues.apache.org/jira/browse/MESOS-7874
Project: Mesos
Issue Type: Improvement
Components: modules
Reporter: Zhitao Li
Assignee: Zhitao Li
Our use case: we need a non-blocking prelaunch hook to integrate with our own
secret management system, and this hook needs to work under both
{{DockerContainerizer}} and {{MesosContainerizer}}, for both {{custom
executor}} and {{command executor}}, with proper access to {{TaskInfo}}
(actually certain labels on it).
As of 1.3.0, the hooks in [hook.hpp |
https://github.com/apache/mesos/blob/1.3.0/include/mesos/hook.hpp] pretty
inconsistent on these combination cases.
The closest option on is {{slavePreLaunchDockerTaskExecutorDecorator}}, however
it has a couple of problems:
1. For DockerContainerizer + custom executor, it strips away TaskInfo and sends
a `None()` instead;
2. This hook is not called on {{MesosContainerizer}} at all. I guess it's
because people can implement an {{isolator}}? However, it creates extra work
for module authors and operators.
The other option is {{masterLaunchTaskLabelDecorator}}, but it has own problems:
1. Error are silently swallowed so module cannot stop the task running sequence;
2. It's a blocking version, which means we cannot wait for another subprocess's
or RPC result.
I'm inclined to fix the two problems on
{{slavePreLaunchDockerTaskExecutorDecorator}}, but open to other suggestions.
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