Jamie -
The details would of course be entirely dependent on what changed, but with
Lucene trunk/4.0 there is the flexible indexing API with codecs. I imagine
with a compatibility codec layer one could provide some insulation to changes.
You're at big scale, so the "just reindex everything" answer isn't really
satisfactory I understand. But locking in to a version of Lucene may be a
decent stop-gap solution, and if/when the format changes you can upgrade one
node at a time (the Solr request/response won't change!) and reindex in a
rolling manner probably. Again, it's still risky as there may be changes to
the index format needed for enhancements to SolrCloud that you want so you'd be
stuck at a fixed place with SolrCloud until you could do some reindexing.
Erik
On Dec 7, 2011, at 08:50 , Jamie Johnson wrote:
> Erik,
>
> Do you have any details behind what would be required to write a tool
> to move from one index format to another? Any examples/suggestions
> would be appreciated.
>
> On Tue, Dec 6, 2011 at 5:19 PM, Jamie Johnson <jej2...@gmail.com> wrote:
>> What about modifying something like SolrIndexConfig.java to change the
>> lucene version that is used when creating the index? (may not be the
>> right place, but is something like this possible?)
>>
>> On Tue, Dec 6, 2011 at 5:13 PM, Erik Hatcher <erik.hatc...@gmail.com> wrote:
>>> Right. Not sure what to advise you. We have worked on this problem with
>>> our LucidWorks platform and have some tools available to do this sort of
>>> thing, I think, but it's not generally something that you can do with
>>> Lucene going from a snapshot to a released version. Perhaps others with
>>> deeper insight will chime in.
>>>
>>> Erik
>>>
>>>
>>>
>>> On Dec 6, 2011, at 16:54 , Jamie Johnson wrote:
>>>
>>>> Problem is that really doesn't help me. We still have the same issue
>>>> that when the 4.0 becomes final there is no migration utility from
>>>> this pre 4.0 version to 4.0, right?
>>>>
>>>>
>>>> On Tue, Dec 6, 2011 at 4:36 PM, Erik Hatcher <erik.hatc...@gmail.com>
>>>> wrote:
>>>>> Oh geez... no... I didn't mean 3.x JARs... I meant the trunk/4.0 ones
>>>>> that are there now.
>>>>>
>>>>> Erik
>>>>>
>>>>> On Dec 6, 2011, at 16:22 , Jamie Johnson wrote:
>>>>>
>>>>>> So if I wanted to used lucene index 3.5 with SolrCloud I "should" be
>>>>>> able to just move the 3.5 jars in and remove any of the snapshot jars
>>>>>> that are present when I build locally?
>>>>>>
>>>>>> On Tue, Dec 6, 2011 at 4:06 PM, Erik Hatcher <erik.hatc...@gmail.com>
>>>>>> wrote:
>>>>>>> Jamie -
>>>>>>>
>>>>>>> I think the best thing that you could do here would be to lock in a
>>>>>>> version of Lucene (all the Lucene libraries) that you use with
>>>>>>> SolrCloud. Certainly not out of the realm of possibilities of some
>>>>>>> upcoming SolrCloud capability that requires some upgrading of Lucene
>>>>>>> though, but you may be set for a little while at least.
>>>>>>>
>>>>>>> Erik
>>>>>>>
>>>>>>> On Dec 6, 2011, at 15:57 , Jamie Johnson wrote:
>>>>>>>
>>>>>>>> Thanks, but I don't believe that will do it. From my understanding
>>>>>>>> that does not control the index version written, it's used to control
>>>>>>>> the behavior of some analyzers (taken from some googling). I'd love
>>>>>>>> if someone told me otherwise though.
>>>>>>>>
>>>>>>>> On Tue, Dec 6, 2011 at 3:48 PM, Alireza Salimi
>>>>>>>> <alireza.sal...@gmail.com> wrote:
>>>>>>>>> Hi, I'm not sure if it would help.
>>>>>>>>>
>>>>>>>>> in solrconfig.xml:
>>>>>>>>>
>>>>>>>>> <!-- Controls what version of Lucene various components of Solr
>>>>>>>>> adhere to. Generally, you want to use the latest version to
>>>>>>>>> get all bug fixes and improvements. It is highly recommended
>>>>>>>>> that you fully re-index after changing this setting as it can
>>>>>>>>> affect both how text is indexed and queried.
>>>>>>>>> -->
>>>>>>>>> <luceneMatchVersion>LUCENE_34</luceneMatchVersion>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Tue, Dec 6, 2011 at 3:14 PM, Jamie Johnson <jej2...@gmail.com>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Is there a way to specify the index version solr uses? We're
>>>>>>>>>> currently using SolrCloud but with the index format changing I'd be
>>>>>>>>>> preferable to be able to specify a particular index format to avoid
>>>>>>>>>> having to do a complete reindex. Is this possible?
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Alireza Salimi
>>>>>>>>> Java EE Developer
>>>>>>>
>>>>>
>>>
