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https://issues.apache.org/jira/browse/YARN-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13774274#comment-13774274
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Karthik Kambatla commented on YARN-1026:
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Yes. The root's ACLs (as in yarn-1222-1.patch) are (the ACLs passed through the
conf minus create-delete perms) + (RM ACL with exclusive create-delete perms).
> Test and verify ACL based ZKRMStateStore fencing for RM State Store
> -------------------------------------------------------------------
>
> Key: YARN-1026
> URL: https://issues.apache.org/jira/browse/YARN-1026
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Bikas Saha
> Assignee: Karthik Kambatla
>
> ZooKeeper allows create/delete ACL's for immediate children of a znode. It
> also has admin ACL's on a znode that allow changing the create/delete ACL's
> on that znode. RM instances could share the admin ACL's on the state store
> root znode. When an RM transitions to active, it can use the shared admin
> ACL's to give itself exclusive create/delete permissions on the children of
> the root znode. If all ZK state store operations are atomic and involve a
> create/delete znode then the above effectively fences other RM instances from
> modifying the store. This ACL change is only allowed when transitioning to
> active.
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