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From Ibrahim <i.s.el-san...@newcastle.ac.uk>
Subject RE: Question about the two-phrase commit
Date Wed, 07 Jan 2015 00:19:38 GMT
Thank you Edward for replaying.

In my opinion, your first case can’t happen, because the election mechanism will elect the
node that has the latest transaction  (zxid) seen. In this case, it will be only your second
case is correct, unless the node that has latest transaction crashes forever.

From: Edward Carter [via zookeeper-user] [mailto:ml-node+s578899n7580741h95@n2.nabble.com]
Sent: Tuesday, January 06, 2015 11:53 م
To: Ibrahim El-sanosi (PGR)
Subject: Re: Question about the two-phrase commit

If an operation is logged to disk on a minority of servers, then what happens on restart depends
on which server wins the leader election.  Since the new operation is on a minority, depending
on network conditions, a server that did *not* log the operation might win the leader election.
 In this case, the operation will be discarded.  If a server that *did* log the operation
wins the leader election (as would be the case in the absence of network or latency issues),
then the operation will be propagated to the remaining servers in the ensemble.


On Jan 6, 2015, at 3:42 PM, Ibrahim <[hidden email]</user/SendEmail.jtp?type=node&node=7580741&i=0>>

> Hi Alexander,
> So, you meant that if there is operation loged to the disk but it hasn't got
> enough majority, then if the zookeeper servers restart, the new leader will
> re-broadcast the loged operation again to the followers to commit that
> operation.
> Does above what you meant by (NEWLEADER message acts as the accept and
> UPTODATE message acts as commit).
> Am I right?
> Thank you
> Ibrahim
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