SolrJ 5.x compatibility with Solr 4.x

[Karl Wright <da...@gmail.com>]

Hi,

Now that Solr 5.0.0 has been released, the ManifoldCF project needs to
figure out the appropriate time to upgrade to a newer SolrJ.  Can anyone
point me at the backwards-compatibility policy for SolrJ 5.0.0?  Will it
work properly with Solr 4.x?

Thanks in advance,
Karl

Re: SolrJ 5.x compatibility with Solr 4.x

[Shalin Shekhar Mangar <sh...@gmail.com>]

Solrj 4.x will not work with collections created from Solr 5.0 but
otherwise I am not aware of any incompatibility between 4.x and 5. There
was a compat break in Solrj during 4.8 I think but it was due to a bug. The
standard advise on upgrading is to upgrade the client first and then the
server. Solrj 5.0 will work fine with Solr 4.x.

On Fri, Mar 27, 2015 at 6:26 AM, Karl Wright <da...@gmail.com> wrote:

> Thanks, Shawn.
>
> We strive to be sure that the underlying dependencies of SolrJ are all the
> correct versions.  So my question revolved more around any known
> dependencies between SolrJ and specific Solr API elements.  We understand
> that Solr Cloud moves quickly and we try to keep up by updating SolrJ.  It
> would be good to know that efforts were being made to assure backwards
> compatibility so that a newer Solr Cloud would at least work properly
> against an older Solr instance.
>
> If that cannot be assured, then it seems to me like the current
> architecture needs revision in some way.  Clients really aren't able to
> re-release code on the same schedule as Lucene, and cannot be expected to
> support multiple SolrJ libraries simultaneously.
>
> Karl
>
>
> On Fri, Mar 27, 2015 at 9:10 AM, Shawn Heisey <ap...@elyograg.org> wrote:
>
>> On 3/27/2015 2:29 AM, Karl Wright wrote:
>> > Now that Solr 5.0.0 has been released, the ManifoldCF project needs to
>> > figure out the appropriate time to upgrade to a newer SolrJ.  Can anyone
>> > point me at the backwards-compatibility policy for SolrJ 5.0.0?  Will it
>> > work properly with Solr 4.x?
>>
>> We do strive for compatibility, but sometimes there is breakage, in
>> order to achieve progress.
>>
>> If you are NOT running SolrCloud, compatibility between wildly different
>> versions of Solr and SolrJ should be excellent.  For my non-cloud
>> install, I am using SolrJ 5.0.0 with Solr 4.7.2 and 4.9.1 with no
>> problems.
>>
>> If you try to mix a 3.x version with a 4.x or 5.x version, or a 1.x
>> version with anything later, changes in the typical client coding
>> methods will probably be required, but it is extremely likely that it
>> will be possible to make it work.
>>
>> SolrCloud is where the difficulty comes in.  SolrCloud is evolving at an
>> extremely rapid pace, and the coupling between SolrJ and the SolrCloud
>> API (zookeeper in particular) is *extremely* tight.
>>
>> For the most part, if you are running a newer CloudSolrClient version
>> than the server, things should work ... but for best results, I would
>> not allow the version spread to get very wide, preferably not more than
>> one minor release, maybe two.  That means that SolrJ 5.0.0 will probably
>> work well with SolrCloud 4.10.x, and maybe 4.9.x, but I would not be
>> surprised to find incompatibilities even in a small version spread.  You
>> may find that a wide version spread works perfectly ... I have not tried
>> it.
>>
>> Thanks,
>> Shawn
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
>> For additional commands, e-mail: dev-help@lucene.apache.org
>>
>>
>


-- 
Regards,
Shalin Shekhar Mangar.

Re: SolrJ 5.x compatibility with Solr 4.x

[Karl Wright <da...@gmail.com>]

Thanks, Shawn.

We strive to be sure that the underlying dependencies of SolrJ are all the
correct versions.  So my question revolved more around any known
dependencies between SolrJ and specific Solr API elements.  We understand
that Solr Cloud moves quickly and we try to keep up by updating SolrJ.  It
would be good to know that efforts were being made to assure backwards
compatibility so that a newer Solr Cloud would at least work properly
against an older Solr instance.

If that cannot be assured, then it seems to me like the current
architecture needs revision in some way.  Clients really aren't able to
re-release code on the same schedule as Lucene, and cannot be expected to
support multiple SolrJ libraries simultaneously.

Karl


On Fri, Mar 27, 2015 at 9:10 AM, Shawn Heisey <ap...@elyograg.org> wrote:

> On 3/27/2015 2:29 AM, Karl Wright wrote:
> > Now that Solr 5.0.0 has been released, the ManifoldCF project needs to
> > figure out the appropriate time to upgrade to a newer SolrJ.  Can anyone
> > point me at the backwards-compatibility policy for SolrJ 5.0.0?  Will it
> > work properly with Solr 4.x?
>
> We do strive for compatibility, but sometimes there is breakage, in
> order to achieve progress.
>
> If you are NOT running SolrCloud, compatibility between wildly different
> versions of Solr and SolrJ should be excellent.  For my non-cloud
> install, I am using SolrJ 5.0.0 with Solr 4.7.2 and 4.9.1 with no problems.
>
> If you try to mix a 3.x version with a 4.x or 5.x version, or a 1.x
> version with anything later, changes in the typical client coding
> methods will probably be required, but it is extremely likely that it
> will be possible to make it work.
>
> SolrCloud is where the difficulty comes in.  SolrCloud is evolving at an
> extremely rapid pace, and the coupling between SolrJ and the SolrCloud
> API (zookeeper in particular) is *extremely* tight.
>
> For the most part, if you are running a newer CloudSolrClient version
> than the server, things should work ... but for best results, I would
> not allow the version spread to get very wide, preferably not more than
> one minor release, maybe two.  That means that SolrJ 5.0.0 will probably
> work well with SolrCloud 4.10.x, and maybe 4.9.x, but I would not be
> surprised to find incompatibilities even in a small version spread.  You
> may find that a wide version spread works perfectly ... I have not tried
> it.
>
> Thanks,
> Shawn
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
> For additional commands, e-mail: dev-help@lucene.apache.org
>
>

Re: SolrJ 5.x compatibility with Solr 4.x

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

On 3/27/2015 2:29 AM, Karl Wright wrote:
> Now that Solr 5.0.0 has been released, the ManifoldCF project needs to
> figure out the appropriate time to upgrade to a newer SolrJ.  Can anyone
> point me at the backwards-compatibility policy for SolrJ 5.0.0?  Will it
> work properly with Solr 4.x?

We do strive for compatibility, but sometimes there is breakage, in
order to achieve progress.

If you are NOT running SolrCloud, compatibility between wildly different
versions of Solr and SolrJ should be excellent.  For my non-cloud
install, I am using SolrJ 5.0.0 with Solr 4.7.2 and 4.9.1 with no problems.

If you try to mix a 3.x version with a 4.x or 5.x version, or a 1.x
version with anything later, changes in the typical client coding
methods will probably be required, but it is extremely likely that it
will be possible to make it work.

SolrCloud is where the difficulty comes in.  SolrCloud is evolving at an
extremely rapid pace, and the coupling between SolrJ and the SolrCloud
API (zookeeper in particular) is *extremely* tight.

For the most part, if you are running a newer CloudSolrClient version
than the server, things should work ... but for best results, I would
not allow the version spread to get very wide, preferably not more than
one minor release, maybe two.  That means that SolrJ 5.0.0 will probably
work well with SolrCloud 4.10.x, and maybe 4.9.x, but I would not be
surprised to find incompatibilities even in a small version spread.  You
may find that a wide version spread works perfectly ... I have not tried it.

Thanks,
Shawn


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