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From Shawn Heisey <apa...@elyograg.org>
Subject Re: Using _default configset in standalone mode
Date Tue, 02 Jan 2018 21:16:22 GMT
On 1/2/2018 12:55 PM, Alessandro Hoss wrote:
> Actually I haven't tried the bin/solr script because I do everything
> remotely on Solr. Thanks for the tip, it worked the way I want
> (copying the conf to a new folder), but I need to do it through an API
> and choosing what configset to copy from. 

<snip>

> That's exactly what I need. I've tried the Collections API, but it
> doesn't
> work when running on standalone mode (Doesn't it make sense to work
> and emulates the behavior of SolrCloud in standalone mode?).

The Collections API and the entire "collection" abstraction are features
of SolrCloud.  If you're not running in cloud mode, those are not available.

If you want to do absolutely everything remotely without accessing the
filesystem on the Solr server at all, then you're going to have to run
SolrCloud. 

The thing that makes all this possible in cloud mode is ZooKeeper.  All
configurations and cluster state information are in the zookeeper
database when Solr is running in cloud mode.  Cores created via the API
in cloud mode do not have a conf directory, and any conf directories
that are manually created are ignored.

https://zookeeper.apache.org/

For a fully fault-tolerant setup, ZooKeeper requires three separate
physical machines.  A minimum of two Solr machines are required for
fault tolerance.    The smallest possible fault-tolerant SolrCloud setup
is three machines.  Two of them would run both Solr and ZooKeeper, the
third would run ZooKeeper only.  Depending on the nature of the clients
that access Solr, you might also need a load balancer.

If you want a single-server setup that's not redundant, you can run Solr
with an embedded ZooKeeper server.  This is not recommended for
production, but can be useful for dev or staging.

Thanks,
Shawn


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