Lead zookeeper
Overview:
zookeeper is a distributed coordination services,
What is the distributed coordination services? Distributed coordination services in order to achieve a distributed lock;
What is a distributed lock? I hope this is the time for orderly access to resources among multiple processes to share the same resources.
Distributed Lock:
Three core elements:
shackles
Unlock
Lock out
Three questions:
To ensure atomicity operation, the yoke and the lock operation to be performed once timeout
Lock to prevent accidental deletion
On the basis of accidentally deleted lock on Cadogan a daemon thread for continued life lock
Zookeeper distributed lock it?
Temporary order of nodes
Znode four states
Persistent node
Persistent but orderly node node
Temporary node
But ordered the temporary node node
Compare Zookeeper distributed lock and Redis
