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From Shawn Heisey <apa...@elyograg.org>
Subject Re: procedure to restart solrcloud, and config/collection consistency
Date Thu, 09 Feb 2017 15:53:24 GMT
On 2/9/2017 5:24 AM, xavier jmlucjav wrote:
> I always wondered, if this was not really needed, and I could just call
> 'restart' in every node, in a quick loop, and forget about it. Does anyone
> know if this is the case?
>
> My doubt is in regards to changing some config, and then doing the above
> (just restart nodes in a loop). For example, what if I change a config G
> used in collection C, and I restart just one of the nodes (N1), leaving the rest alone.
If all the nodes contain a shard for C, what happens, N1 is using the new config and the rest
are not? how is this handled?

If you want to change the config or schema for a collection and make it
active across all nodes, just use the collections API to RELOAD the
collection.  The change will be picked up everywhere.

https://cwiki.apache.org/confluence/display/solr/Collections+API

To answer your question: No.  Solr does not have the ability to restart
itself.  It would require significant development effort and a
fundamental change in how Solr is started to make it possible.  It is
something that has been discussed, but at this time it is not possible.

One idea that would make this possible is mentioned on the following
wiki page.  It talks about turning Solr into two applications instead of
one:

https://wiki.apache.org/solr/WhyNoWar#Information_that.27s_not_version_specific

Again -- it would not be easy, which is why it hasn't been done yet.

Thanks,
Shawn


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