[
https://issues.apache.org/jira/browse/YARN-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Karthik Kambatla resolved YARN-1026.
------------------------------------
Resolution: Duplicate
YARN-1222 handles the implementation and testing of the implicit fencing
mechanism in ZKRMStateStore. Resolving this as duplicate.
> 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.
--
This message was sent by Atlassian JIRA
(v6.1#6144)
