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From "Brett Eisenberg (JIRA)" <>
Subject [jira] Created: (CASSANDRA-45) Integrate with ZooKeeper to enhance fault tolerance and coordination
Date Thu, 02 Apr 2009 16:03:12 GMT
Integrate with ZooKeeper to enhance fault tolerance and coordination

                 Key: CASSANDRA-45
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Brett Eisenberg

Per Avinash:

(1) Store all configuration specific information in ZK for availability purposes. For eg.
today we store the token info of a node in local disk. In production we lost that disk and
with that the token info.
(2) For storage load balance which does not exist today. I would like to have the notion of
leader who would orchestrate a load balance strategy.
(3) Distributed locks - suppose one of the replicas wanted to trigger a compaction process.
Then we can prevent the other replicas to also initiate one so that we can get better read
(4) There are operation stuff that needs to be set up when bootstrap of new nodes is in order.
This intermediate state can be placed in ZK and then deleted on bootstrap completion. This
way if the node handing of the data dies in between then it can continue from where it left
off on re-start.

additionally, configuration state data, cluster membership, and node visibility could be enhanced
using ZK as well.

Opening ticket for discussion.

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