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From: Michael McCandless <lucene@mikemccandless.com>
To: java-dev@lucene.apache.org
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Subject: Re: segments.gen file
Date: Mon, 2 Mar 2009 09:13:58 -0500
References: <49A354DC.30907@gmail.com>
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Super, thanks!

Mike

Danil =C5=A2ORIN wrote:

> https://issues.apache.org/jira/browse/LUCENE-1551
>
> On Mon, Mar 2, 2009 at 13:40, Michael McCandless
> <lucene@mikemccandless.com> wrote:
>>
>> Ahh good point, that is missing.  Can you open a Jira issue?  Thanks.
>>
>> Mike
>>
>> Danil =C5=A2ORIN wrote:
>>
>>> I'm more interested in reopen(IndexCommit) so I could have full
>>> benefits of LUCENE-1483 (faster open, warm caches, less GC and so =20=

>>> on)
>>> but on specific commit point.
>>>
>>> I'm not sure it's possible in current trunk, and if we have
>>> open(IndexCommit) & company, maybe we should also have similar set =20=

>>> of
>>> methods for reopen?
>>>
>>> On Mon, Mar 2, 2009 at 12:12, Michael McCandless
>>> <lucene@mikemccandless.com> wrote:
>>>>
>>>> This is already available, as of 2.4.
>>>>
>>>> Mike
>>>>
>>>> Danil =C5=A2ORIN wrote:
>>>>
>>>>> What about opening IndexReader/Searcher on certain commit point?
>>>>> Will it be implemented in 2.9?
>>>>>
>>>>> The use-case is similar to the one Michael Busch described, only I
>>>>> would like to open (or reopen) a searcher on specific commit =20
>>>>> point.
>>>>>
>>>>>
>>>>> On Fri, Feb 27, 2009 at 20:31, Michael McCandless
>>>>> <lucene@mikemccandless.com> wrote:
>>>>>>
>>>>>> Michael Busch wrote:
>>>>>>
>>>>>>> Actually I personally don't need Lucene to be "write once". =20
>>>>>>> The reason
>>>>>>> why
>>>>>>> I started this thread about the segments.gen file was that in =20=

>>>>>>> our
>>>>>>> project we
>>>>>>> sometimes need to rollback to a previous commit-point (using =20
>>>>>>> Lucene
>>>>>>> 2.4.0)
>>>>>>> that we keep around with the SnapshotDeletionPolicy. To get =20
>>>>>>> rid of the
>>>>>>> newest commit-point we simply delete the most recent segments =20=

>>>>>>> file.
>>>>>>> But
>>>>>>> then
>>>>>>> we also have to delete the segments.gen file, otherwise Lucene =20=

>>>>>>> will
>>>>>>> read
>>>>>>> the
>>>>>>> generation from it and try to find the segments file we =20
>>>>>>> deleted. Then
>>>>>>> Lucene
>>>>>>> will recreate the segments.gen file. This just made me think =20
>>>>>>> that this
>>>>>>> is
>>>>>>> not very clean (deleting and recreating the segments.gen) =20
>>>>>>> especially
>>>>>>> because
>>>>>>> we use a local FS and don't even need the .gen file.
>>>>>>
>>>>>> Ahh... OK.  In trunk/2.9, you can explicitly open an =20
>>>>>> IndexWriter on a
>>>>>> prior
>>>>>> commit point, which will take care of the gen file for you.
>>>>>
>>>>> =
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>>>>
>>>>
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