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From Nawab Zada Asad Iqbal <khi...@gmail.com>
Subject Re: Internal details on how ADDREPLICA executes?
Date Thu, 02 Aug 2018 20:57:14 GMT
Thanks Erick!

On Thu, Aug 2, 2018 at 1:26 PM, Erick Erickson <erickerickson@gmail.com>
wrote:

> Oh my, I see confusion on the horizon. _Which_ autoaddreplica?
>
> Pre 7x and autoscaling, autoAddReplica is all about HDFS and
> spinning up a new Solr instance that points to an existing index
> so there's no impact on the leader (other than normal peer sync
> if you're actively indexing).
>
> Autoscaling, on the other hand (7x) spins up a new replica and
> it goes through sync before it's ready to server queries. This is
> really just an ADDREPLICA and you can test the impacts on
> your particular installation by issuing that collections API
> command.
>
> Best,
> Erick
>
> On Thu, Aug 2, 2018 at 12:20 PM, Nawab Zada Asad Iqbal <khichi@gmail.com>
> wrote:
> > Hi,
> >
> > I am considering using SolrCloud and enable autoADDREPLICA.
> > I am curious on how long does it take for SolrCloud to setup the replica.
> > Before the new replica can start to serve queries, it needs to copy all
> the
> > documents in the current leader and also index whatever new traffic is
> > arriving. How is this state tracked?  I assume SolrCloud knows about this
> > transient state between a new replica creation and being ready to server
> > queries and handles it appropriately.
> >
> > Do I need to consider any performance issues after executing addReplica
> > (i.e., will it affect the current leader's index or querying response
> time
> > when older segment files are being copied to the new replica).
> >
> >
> > Thanks
> > Nawab
>

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