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https://issues.apache.org/jira/browse/MESOS-2060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Niklas Quarfot Nielsen updated MESOS-2060:
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Shepherd: Niklas Quarfot Nielsen
> Add support for 'hooks' in task launch sequence
> -----------------------------------------------
>
> Key: MESOS-2060
> URL: https://issues.apache.org/jira/browse/MESOS-2060
> Project: Mesos
> Issue Type: Task
> Components: modules
> Reporter: Niklas Quarfot Nielsen
> Assignee: Kapil Arya
>
> Similar to Apache Modules, hooks allows module writers to tie into internal
> components which may not be suitable to be abstracted entirely behind modules
> but rather let's them define actions on so-called hooks
> (http://httpd.apache.org/docs/2.2/developer/hooks.html).
> In Apache Web Server, this lets people tie into the request processing cycle,
> in Mesos one place interesting place to start could be pre and post actions
> for master and slave task launch sequence.
> Examples could be external statistics/metrics gathering, security
> infrastructure etc.
> The main idea is to enable modules to register themselves as hook providers
> and select them through a new flag: --hooks=”module_name1, module_name2,
> ...”. This will require a new module type called 'HookModule'.
> A new ‘HookManager’ will query each module and get an object back of type
> ‘Hooks’ which has virtual member functions which points to the desired
> callbacks in the module.
> For example,
> {code}
> class Hooks {
> public:
> virtual TaskInfo preMasterLaunchTask(TaskInfo task) = 0;
> virtual TaskInfo postMasterLaunchTask(TaskInfo task) = 0;
> virtual TaskInfo preSlaveLaunchTask(TaskInfo task) = 0;
> virtual TaskInfo postSlaveLaunchTask(TaskInfo task) = 0;
> // ...
> };
> {code}
> An example of the call site in Mesos could be:
> {code}
> Master::launchTask(..., TaskInfo task, ...)
> {
> task = HookManager::preMasterLaunchTask(task);
> ...
> task = HookManager::postMasterLaunchTask(task);
> }
> {code}
> With regards to versioning, hooks gets run inline with internal mesos code -
> so we would suggest a conservative policy where hook modules need to be
> compiled against the current version of Mesos.
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