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From Erick Erickson <erickerick...@gmail.com>
Subject Re: Upgrading from lucene 2.9.1 to 5.X
Date Fri, 17 Jul 2015 17:06:43 GMT
Please look at the CHANGES.txt file for Solr and/or Lucene,
there's a "New Features" section for every release.

Best,
Erick

On Fri, Jul 17, 2015 at 7:55 AM, Shuangyang Yang
<syang@linkedin.com.invalid> wrote:
> Erick, Amish,
>
> Thank you very much for your reply. They are really helpful. Can you tell
> me what are the compelling features from 2.9.1 to 5.X? I¹m sure there are
> many.
>
> Thank you very much
> Best Regards
> ---
> Shuangyang Yang
>
> linkedin.com/in/everyoung <www.linkedin.com/in/everyoung>
>
>
>
>
> On 7/16/15, 8:41 PM, "Erick Erickson" <erickerickson@gmail.com> wrote:
>
>>You have two real choices here:
>>1> reindex your corpus under 5x
>>2> follow a tortuous upgrade path. Solr/Lucene only promise to
>>be backwards compatible through one major version. Thus
>>Lucene 3x can read Lucene 2x. But Lucene 4x cannot read
>>read Lucene 2x.
>>
>>So you'd have to go 2x->3x->4x->5x with chances for mis-steps
>>all along the way.
>>
>>Best,
>>Erick
>>
>>On Thu, Jul 16, 2015 at 8:27 PM, Shah, Amish <amish.shah@intel.com> wrote:
>>> No,  the file format is not compatible. I think it changed in 4.0.
>>>
>>> Amish
>>>
>>> On 7/16/15, 6:45 PM, "Shuangyang Yang" <syang@linkedin.com.INVALID>
>>>wrote:
>>>
>>>>Hi there,
>>>>
>>>>We are using lucene 2.9.1 in our product and thinking of upgrading to
>>>>5.X. Is it plausible? Is the file format compatible? Is there any guide
>>>>document that can give tips on how to do it?
>>>>
>>>>Thank you very much
>>>>Best Regards
>>>>---
>>>>Shuangyang Yang
>>>>linkedin.com/in/everyoung<www.linkedin.com/in/everyoung>
>>>
>>>
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>
>
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