Apache SOLR upgrade from 5.2.1 to 7.x

[padmanabhan1616 <pa...@gmail.com>]

Hi Team,

We planning to upgrade SOLR from 5.2.1 to 7.x version. I just googled and
found that there is no way of upgrading from 5.x to 7.x directly 

Here are the list of suggestions gathered from different sources

1. We cannot upgrade directly from 5.x to 7.x instead upgrade to 5.5 then
upgrade to 7 as there is major index format level changes taken place in 5.5
or later version.
1. Use index upgrade tool which can allow to upgrade all old indexes to new
index format then we can upgrade to 7.x version easily.

We are really struggling to get the right options here for this upgrade. 

I Know we are running very old version. We need this to be happen ASAP. 

Can you please suggest us what is the right approcuh here to upgrade from
5.2.1 version to 7.x version.

Thanks,
Padmanabhan



--
Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html

Re: Apache SOLR upgrade from 5.2.1 to 7.x

[Erick Erickson <er...@gmail.com>]

IIUC the 5x->7x upgrade won't immediately fail like a 6x->8x upgrade
would, but neither is it really expected to produce the results you
expect due to differences in the index formats.
On Sat, Oct 6, 2018 at 1:31 PM Jan Høydahl <ja...@cominvent.com> wrote:
>
> Shawn, my impression is that you WILL be able to upgrade a 5.x index to 6.x and then to 7.x for use with 7.x. So your wiki page is a bit too strict here.
> But if you ever want to upgrade to 8.x, that version will require the "first created" version to be 7.0 or later, so you'll need a full reindex.
> See SOLR-12281 <https://issues.apache.org/jira/browse/SOLR-12281>.
>
> I'd also recommend to plan for a full re-index, and also upgrade to new field types etc at the same time.
> Feel free to give this tool https://github.com/cominvent/solr-tools/tree/master/upgradeindex <https://github.com/cominvent/solr-tools/tree/master/upgradeindex> a spin in your test environtment and then just test whether 7.5 works on that index :)
>
> --
> Jan Høydahl, search solution architect
> Cominvent AS - www.cominvent.com
>
> > 5. okt. 2018 kl. 16:49 skrev Shawn Heisey <ap...@elyograg.org>:
> >
> > On 10/5/2018 4:41 AM, padmanabhan1616 wrote:
> >> 1. We cannot upgrade directly from 5.x to 7.x instead upgrade to 5.5 then
> >> upgrade to 7 as there is major index format level changes taken place in 5.5
> >> or later version.
> >
> > Solr 7.x cannot read indexes from 5.5.  It can only read indexes that were *fully* constructed by versions back to 6.0.0.
> >
> >> 1. Use index upgrade tool which can allow to upgrade all old indexes to new
> >> index format then we can upgrade to 7.x version easily.
> >
> > We have been advised by Lucene experts that if a version that's at least two major versions before the target version has *EVER* touched the index, there's no guarantee that the index will work even after upgrading through the major versions one by one. The compatibility guarantee only goes back one major version.
> >
> > I would strongly recommend with ANY upgrade that you always build the index from scratch.  That produces the best results.
> >
> > This is becoming a frequently asked question, so I have built a wiki page to answer it:
> >
> > https://wiki.apache.org/solr/VersionCompatibility
> >
> > Thanks,
> > Shawn
> >
>

Re: Apache SOLR upgrade from 5.2.1 to 7.x

[Jan Høydahl <ja...@cominvent.com>]

Shawn, my impression is that you WILL be able to upgrade a 5.x index to 6.x and then to 7.x for use with 7.x. So your wiki page is a bit too strict here.
But if you ever want to upgrade to 8.x, that version will require the "first created" version to be 7.0 or later, so you'll need a full reindex.
See SOLR-12281 <https://issues.apache.org/jira/browse/SOLR-12281>.

I'd also recommend to plan for a full re-index, and also upgrade to new field types etc at the same time.
Feel free to give this tool https://github.com/cominvent/solr-tools/tree/master/upgradeindex <https://github.com/cominvent/solr-tools/tree/master/upgradeindex> a spin in your test environtment and then just test whether 7.5 works on that index :)

--
Jan Høydahl, search solution architect
Cominvent AS - www.cominvent.com

> 5. okt. 2018 kl. 16:49 skrev Shawn Heisey <ap...@elyograg.org>:
> 
> On 10/5/2018 4:41 AM, padmanabhan1616 wrote:
>> 1. We cannot upgrade directly from 5.x to 7.x instead upgrade to 5.5 then
>> upgrade to 7 as there is major index format level changes taken place in 5.5
>> or later version.
> 
> Solr 7.x cannot read indexes from 5.5.  It can only read indexes that were *fully* constructed by versions back to 6.0.0.
> 
>> 1. Use index upgrade tool which can allow to upgrade all old indexes to new
>> index format then we can upgrade to 7.x version easily.
> 
> We have been advised by Lucene experts that if a version that's at least two major versions before the target version has *EVER* touched the index, there's no guarantee that the index will work even after upgrading through the major versions one by one. The compatibility guarantee only goes back one major version.
> 
> I would strongly recommend with ANY upgrade that you always build the index from scratch.  That produces the best results.
> 
> This is becoming a frequently asked question, so I have built a wiki page to answer it:
> 
> https://wiki.apache.org/solr/VersionCompatibility
> 
> Thanks,
> Shawn
> 

Re: Apache SOLR upgrade from 5.2.1 to 7.x

[Shawn Heisey <ap...@elyograg.org>]

On 10/5/2018 4:41 AM, padmanabhan1616 wrote:
> 1. We cannot upgrade directly from 5.x to 7.x instead upgrade to 5.5 then
> upgrade to 7 as there is major index format level changes taken place in 5.5
> or later version.

Solr 7.x cannot read indexes from 5.5.  It can only read indexes that 
were *fully* constructed by versions back to 6.0.0.

> 1. Use index upgrade tool which can allow to upgrade all old indexes to new
> index format then we can upgrade to 7.x version easily.

We have been advised by Lucene experts that if a version that's at least 
two major versions before the target version has *EVER* touched the 
index, there's no guarantee that the index will work even after 
upgrading through the major versions one by one. The compatibility 
guarantee only goes back one major version.

I would strongly recommend with ANY upgrade that you always build the 
index from scratch.  That produces the best results.

This is becoming a frequently asked question, so I have built a wiki 
page to answer it:

https://wiki.apache.org/solr/VersionCompatibility

Thanks,
Shawn