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From Furkan KAMACI <furkankam...@gmail.com>
Subject Re: Push/pull model between leader and replica in one shard
Date Tue, 16 Apr 2013 22:56:05 GMT
Really nice presentation.

2013/4/17 Mark Miller <markrmiller@gmail.com>

>
> On Apr 16, 2013, at 1:36 AM, SuoNayi <suonayi2006@163.com> wrote:
>
> > Hi, can someone explain more details about what model is used to sync
> docs between the lead and
> > replica in the shard?
> > The model can be push or pull.Supposing I have only one shard that has 1
> leader and 2 replicas,
> > when the leader receives a update request, does it will scatter the
> request to each available and active
> > replica at first and then processes the request locally at last?In this
> case if the replicas are able to catch
> > up with the leader can I think this is a push model that the leader
> pushes updates to it's replicas?
>
> Currently, the leader adds the doc locally and then sends it to all
> replicas concurrently.
>
> >
> >
> > What happens if a replica is behind the leader?Will the replica pull
> docs from the leader and keep
> > a track of the coming updates from the lead in a log(called tlog)?If so
> when it complete pulling docs
> > it will replay updates in the tlog at last?
>
> If an update forwarded from a leader to a replica fails it's likely
> because that replica died. Just in case, the leader will ask that replica
> to enter "recovery".
>
> When a node comes up and is not a leader, it also enters "recovery".
>
> Recovery tries to peersync from the leader, and if that fails (works if
> off by about 100 updates), it replicates the entire index.
>
> If you are interested in more details on the SolrCloud architecture, I've
> given a few talks on it - two of them here:
>
> http://vimeo.com/43913870
> http://www.youtube.com/watch?v=eVK0wLkLw9w
>
> - Mark
>
>

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