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From Furkan KAMACI <furkankam...@gmail.com>
Subject Re: Push/pull model between leader and replica in one shard
Date Wed, 17 Apr 2013 07:43:55 GMT
Hej Mark;

What did you use to prepare your presentation, its really nice.

2013/4/17 Furkan KAMACI <furkankamaci@gmail.com>

> 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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