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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "ZooKeeper/MountRemoteZookeeper" by Alexander Shraer
Date Mon, 13 Jun 2011 12:47:47 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

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.

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