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https://issues.apache.org/jira/browse/YARN-6799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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weiyuan updated YARN-6799:
--------------------------
Attachment: YARN-6799.002.patch
> Remove the duplicated code in CGroupsHandlerImp.java
> ----------------------------------------------------
>
> Key: YARN-6799
> URL: https://issues.apache.org/jira/browse/YARN-6799
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: nodemanager
> Affects Versions: 3.0.0-alpha3
> Reporter: Yufei Gu
> Assignee: weiyuan
> Priority: Trivial
> Attachments: YARN-6799.001.patch, YARN-6799.002.patch
>
>
> The else clause in initializeCGroupController is not necessary.
> {code}
> public void initializeCGroupController(CGroupController controller) throws
> ResourceHandlerException {
> if (enableCGroupMount) {
> // We have a controller that needs to be mounted
> mountCGroupController(controller);
> } else {
> String controllerPath = getControllerPath(controller);
> if (controllerPath == null) {
> throw new ResourceHandlerException(
> String.format("Controller %s not mounted."
> + " You either need to mount it with %s"
> + " or mount cgroups before launching Yarn",
> controller.getName(), YarnConfiguration.
> NM_LINUX_CONTAINER_CGROUPS_MOUNT));
> }
> }
> // We are working with a pre-mounted contoller
> // Make sure that Yarn cgroup hierarchy path exists
> initializePreMountedCGroupController(controller);
> }
> private void initializePreMountedCGroupController(CGroupController
> controller)
> throws ResourceHandlerException {
> // Check permissions to cgroup hierarchy and
> // create YARN cgroup if it does not exist, yet
> String controllerPath = getControllerPath(controller);
> if (controllerPath == null) {
> throw new ResourceHandlerException(
> String.format("Controller %s not mounted."
> + " You either need to mount it with %s"
> + " or mount cgroups before launching Yarn",
> controller.getName(), YarnConfiguration.
> NM_LINUX_CONTAINER_CGROUPS_MOUNT));
> }
> {code}
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