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The "ZooKeeper/MountRemoteZookeeper" page has been changed by Alexander Shraer: http://wiki.apache.org/hadoop/ZooKeeper/MountRemoteZookeeper?action=diff&rev1=9&rev2=10 In addition, each cluster has an observer process for each remote partition mounted to the local namespace. The observer may replicate only the mounted part of the remote tree, not necessarily the whole remote tree. The leader is responsible for keeping track of these observers: it creates a new observer process when a new mount is performed or upon observer failure and kills an observer when an unmount is executed. - Each ZooKeeper cluster tracks only the clients connected to servers in that cluster. + Each ZooKeeper cluster tracks only the clients connected to servers in that cluster. To support ephemeral nodes a cluster can subscribe with another cluster to be notified upon the failure of a particular client. When receiving a request for a local node, the leader schedules the request in its normal pipeline and executes it with ZAB. When receiving a request for a mounted partition, it then forwards the request to the appropriate observer. When the operation is committed, the observer returns a responce to the leader, which forwards it back to the follower.
