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https://issues.apache.org/jira/browse/YARN-5280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15665449#comment-15665449
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Sidharta Seethana commented on YARN-5280:
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YARN-3853 added the ContainerRuntime interface. The objective of adding the
‘prepareContainer()’ and ‘reapContainer()’ methods was to provide finer grained
control of the container lifecycle (and at some point add corresponding
instrumentation to track where time is spent in the container lifecycle). Using
docker containers as an example, ‘prepareContainer()’ could be hooked into
docker ‘create’ (and maybe even image localization). reapContainer() could be
used for (optional) post complete container deletion.
Once container runtimes were introduced, the interaction with resource handlers
got a bit … trickier. Right now, the same cgroups based resource handlers can
be used across the ‘default’ and ‘docker’ container runtimes (mainly due to
docker’s cgroup-parent support). In this case, ‘postExecute()’ is used to clean
up the container cgroups created by YARN and ‘reapContainer()’ could be used to
clean up/remove the container itself.
I hope that helps.
> Allow YARN containers to run with Java Security Manager
> -------------------------------------------------------
>
> Key: YARN-5280
> URL: https://issues.apache.org/jira/browse/YARN-5280
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: nodemanager, yarn
> Affects Versions: 2.6.4
> Reporter: Greg Phillips
> Assignee: Greg Phillips
> Priority: Minor
> Labels: oct16-medium
> Attachments: YARN-5280.001.patch, YARN-5280.002.patch,
> YARN-5280.003.patch, YARN-5280.004.patch, YARN-5280.patch,
> YARNContainerSandbox.pdf
>
>
> YARN applications have the ability to perform privileged actions which have
> the potential to add instability into the cluster. The Java Security Manager
> can be used to prevent users from running privileged actions while still
> allowing their core data processing use cases.
> Introduce a YARN flag which will allow a Hadoop administrator to enable the
> Java Security Manager for user code, while still providing complete
> permissions to core Hadoop libraries.
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