Re: Q about ZK internal: how commit is being remembered

henry is correct. just to state another way, Zab guarantees that if a quorum of servers have accepted a transaction, the transaction will commit. this means that if less than a quorum of servers have accepted a transaction, we can commit or discard. the only constraint we have in choosing is

Re: Q about ZK internal: how commit is being remembered

Thanks henry and ben, actually I have read the paper henry mentioned in this mail, but I'm still not so clear with some of the details. Anyway, maybe more study on the source code can help me understanding. Since Ben said that, if less than a quorum of servers have accepted a transaction, we can

Re: Q about ZK internal: how commit is being remembered

Qian, ZooKeeper gurantees that if a client sees some transaction response, then it will persist but the one's that a client does not see might be discarded or committed. So in case a quorum does not log the transaction, there might be a case wherein a zookeeper server which does not have the

Re: Q about ZK internal: how commit is being remembered

Hi Qian Ye, Could you forward me a copy of the paper? I don't have ACM access...duo xie! btw, I was a ZJUer too.. cheers, Qing On Fri, Jan 29, 2010 at 10:02 AM, Qian Ye yeqian@gmail.com wrote: Thanks henry and ben, actually I have read the paper henry mentioned in this mail, but

Re: Q about ZK internal: how commit is being remembered

Thanks Mahadev, I see what you mean. On Fri, Jan 29, 2010 at 10:06 AM, Mahadev Konar maha...@yahoo-inc.comwrote: Qian, ZooKeeper gurantees that if a client sees some transaction response, then it will persist but the one's that a client does not see might be discarded or committed. So in

Re: Q about ZK internal: how commit is being remembered

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Re: Q about ZK internal: how commit is being remembered

Hi Henry: According to your explanation, *ZAB makes the guarantee that a proposal which has been logged by a quorum of followers will eventually be committed* , however, the source code of Zookeeper, the FastLeaderElection.java file, shows that, in the election, the candidates only provide their

Re: Q about ZK internal: how commit is being remembered

Hi - Note that a machine that has the highest received zxid will necessarily have seen the most recent transaction that was logged by a quorum of followers (the FIFO property of TCP again ensures that all previous messages will have been seen). This is the property that ZAB needs to preserve. The