just a quick point:
public void maybeReopen() throws IOException { //D
long currentVersion = currentSearcher.getIndexReader().getVersion();
if (IndexReader.getCurrentVersion(dir) != currentVersion) {
IndexReader newReader = currentSearcher.getIndexReader().reopen();
assert newReader != currentSearcher.getIndexReader();
IndexSearcher newSearcher = new IndexSearcher(newReader);
warm(newSearcher);
swapSearcher(newSearcher);
}
}
should the above be synchronised?
On Sun, Mar 1, 2009 at 1:25 PM, Amin Mohammed-Coleman <[email protected]>wrote:
> thanks. i will rewrite..in between giving my baby her feed and playing
> with the other child and my wife who wants me to do several other things!
>
>
>
> On Sun, Mar 1, 2009 at 1:20 PM, Michael McCandless <
> [email protected]> wrote:
>
>>
>> Amin Mohammed-Coleman wrote:
>>
>> Hi
>>> Thanks for your input. I would like to have a go at doing this myself
>>> first, Solr may be an option.
>>>
>>> * You are creating a new Analyzer & QueryParser every time, also
>>> creating unnecessary garbage; instead, they should be created once
>>> & reused.
>>>
>>> -- I can moved the code out so that it is only created once and reused.
>>>
>>>
>>> * You always make a new IndexSearcher and a new MultiSearcher even
>>> when nothing has changed. This just generates unnecessary garbage
>>> which GC then must sweep up.
>>>
>>> -- This was something I thought about. I could move it out so that it's
>>> created once. However I presume inside my code i need to check whether
>>> the
>>> indexreaders are update to date. This needs to be synchronized as well I
>>> guess(?)
>>>
>>
>> Yes you should synchronize the check for whether the IndexReader is
>> current.
>>
>> * I don't see any synchronization -- it looks like two search
>>> requests are allowed into this method at the same time? Which is
>>> dangerous... eg both (or, more) will wastefully reopen the
>>> readers.
>>> -- So i need to extract the logic for reopening and provide a
>>> synchronisation mechanism.
>>>
>>
>> Yes.
>>
>>
>> Ok. So I have some work to do. I'll refactor the code and see if I can
>>> get
>>> inline to your recommendations.
>>>
>>>
>>> On Sun, Mar 1, 2009 at 12:11 PM, Michael McCandless <
>>> [email protected]> wrote:
>>>
>>>
>>>> On a quick look, I think there are a few problems with the code:
>>>>
>>>> * I don't see any synchronization -- it looks like two search
>>>> requests are allowed into this method at the same time? Which is
>>>> dangerous... eg both (or, more) will wastefully reopen the
>>>> readers.
>>>>
>>>> * You are over-incRef'ing (the reader.incRef inside the loop) -- I
>>>> don't see a corresponding decRef.
>>>>
>>>> * You reopen and warm your searchers "live" (vs with BG thread);
>>>> meaning the unlucky search request that hits a reopen pays the
>>>> cost. This might be OK if the index is small enough that
>>>> reopening & warming takes very little time. But if index gets
>>>> large, making a random search pay that warming cost is not nice to
>>>> the end user. It erodes their trust in you.
>>>>
>>>> * You always make a new IndexSearcher and a new MultiSearcher even
>>>> when nothing has changed. This just generates unnecessary garbage
>>>> which GC then must sweep up.
>>>>
>>>> * You are creating a new Analyzer & QueryParser every time, also
>>>> creating unnecessary garbage; instead, they should be created once
>>>> & reused.
>>>>
>>>> You should consider simply using Solr -- it handles all this logic for
>>>> you and has been well debugged with time...
>>>>
>>>> Mike
>>>>
>>>> Amin Mohammed-Coleman wrote:
>>>>
>>>> The reason for the indexreader.reopen is because I have a webapp which
>>>>
>>>>> enables users to upload files and then search for the documents. If I
>>>>> don't
>>>>> reopen i'm concerned that the facet hit counter won't be updated.
>>>>>
>>>>> On Tue, Feb 24, 2009 at 8:32 PM, Amin Mohammed-Coleman <
>>>>> [email protected]
>>>>>
>>>>>> wrote:
>>>>>>
>>>>>
>>>>> Hi
>>>>>
>>>>>> I have been able to get the code working for my scenario, however I
>>>>>> have
>>>>>> a
>>>>>> question and I was wondering if I could get some help. I have a list
>>>>>> of
>>>>>> IndexSearchers which are used in a MultiSearcher class. I use the
>>>>>> indexsearchers to get each indexreader and put them into a
>>>>>> MultiIndexReader.
>>>>>>
>>>>>> IndexReader[] readers = new IndexReader[searchables.length];
>>>>>>
>>>>>> for (int i =0 ; i < searchables.length;i++) {
>>>>>>
>>>>>> IndexSearcher indexSearcher = (IndexSearcher)searchables[i];
>>>>>>
>>>>>> readers[i] = indexSearcher.getIndexReader();
>>>>>>
>>>>>> IndexReader newReader = readers[i].reopen();
>>>>>>
>>>>>> if (newReader != readers[i]) {
>>>>>>
>>>>>> readers[i].close();
>>>>>>
>>>>>> }
>>>>>>
>>>>>> readers[i] = newReader;
>>>>>>
>>>>>>
>>>>>>
>>>>>> }
>>>>>>
>>>>>> multiReader = new MultiReader(readers);
>>>>>>
>>>>>> OpenBitSetFacetHitCounter facetHitCounter =
>>>>>> newOpenBitSetFacetHitCounter();
>>>>>>
>>>>>> IndexSearcher indexSearcher = new IndexSearcher(multiReader);
>>>>>>
>>>>>>
>>>>>> I then use the indexseacher to do the facet stuff. I end the code
>>>>>> with
>>>>>> closing the multireader. This is causing problems in another method
>>>>>> where I
>>>>>> do some other search as the indexreaders are closed. Is it ok to not
>>>>>> close
>>>>>> the multiindexreader or should I do some additional checks in the
>>>>>> other
>>>>>> method to see if the indexreader is closed?
>>>>>>
>>>>>>
>>>>>>
>>>>>> Cheers
>>>>>>
>>>>>>
>>>>>> P.S. Hope that made sense...!
>>>>>>
>>>>>>
>>>>>> On Mon, Feb 23, 2009 at 7:20 AM, Amin Mohammed-Coleman <
>>>>>> [email protected]
>>>>>>
>>>>>>> wrote:
>>>>>>>
>>>>>>
>>>>>> Hi
>>>>>>
>>>>>>>
>>>>>>> Thanks just what I needed!
>>>>>>>
>>>>>>> Cheers
>>>>>>> Amin
>>>>>>>
>>>>>>>
>>>>>>> On 22 Feb 2009, at 16:11, Marcelo Ochoa <[email protected]>
>>>>>>> wrote:
>>>>>>>
>>>>>>> Hi Amin:
>>>>>>>
>>>>>>> Please take a look a this blog post:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> http://sujitpal.blogspot.com/2007/04/lucene-search-within-search-with.html
>>>>>>>> Best regards, Marcelo.
>>>>>>>>
>>>>>>>> On Sun, Feb 22, 2009 at 1:18 PM, Amin Mohammed-Coleman <
>>>>>>>> [email protected]>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Hi
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Sorry to re send this email but I was wondering if I could get some
>>>>>>>>> advice
>>>>>>>>> on this.
>>>>>>>>>
>>>>>>>>> Cheers
>>>>>>>>>
>>>>>>>>> Amin
>>>>>>>>>
>>>>>>>>> On 16 Feb 2009, at 20:37, Amin Mohammed-Coleman <[email protected]>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> Hi
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> I am looking at building a faceted search using Lucene. I know
>>>>>>>>>> that
>>>>>>>>>> Solr
>>>>>>>>>> comes with this built in, however I would like to try this by
>>>>>>>>>> myself
>>>>>>>>>> (something to add to my CV!). I have been looking around and I
>>>>>>>>>> found
>>>>>>>>>> that
>>>>>>>>>> you can use the IndexReader and use TermVectors. This looks ok
>>>>>>>>>> but
>>>>>>>>>> I'm
>>>>>>>>>> not
>>>>>>>>>> sure how to filter the results so that a particular user can only
>>>>>>>>>> see
>>>>>>>>>> a
>>>>>>>>>> subset of results. The next option I was looking at was something
>>>>>>>>>> like
>>>>>>>>>>
>>>>>>>>>> Term term1 = new Term("brand", "ford");
>>>>>>>>>> Term term2 = new Term("brand", "vw");
>>>>>>>>>> Term[] termsArray = new Term[] { term1, term2 };un
>>>>>>>>>> int[] docFreqs = indexSearcher.docFreqs(termsArray);
>>>>>>>>>>
>>>>>>>>>> The only problem here is that I have to provide the brand type
>>>>>>>>>> each
>>>>>>>>>> time a
>>>>>>>>>> new brand is created. Again I'm not sure how I can filter the
>>>>>>>>>> results
>>>>>>>>>> here.
>>>>>>>>>> It may be that I'm using the wrong api methods to do this.
>>>>>>>>>>
>>>>>>>>>> I would be grateful if I could get some advice on this.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Cheers
>>>>>>>>>> Amin
>>>>>>>>>>
>>>>>>>>>> P.S. I am basically trying to do something that displays the
>>>>>>>>>> following
>>>>>>>>>>
>>>>>>>>>> Personal Contact (23) Business Contact (45) and so on..
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>> --
>>>>>>>> Marcelo F. Ochoa
>>>>>>>> http://marceloochoa.blogspot.com/
>>>>>>>> http://marcelo.ochoa.googlepages.com/home
>>>>>>>> ______________
>>>>>>>> Want to integrate Lucene and Oracle?
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> http://marceloochoa.blogspot.com/2007/09/running-lucene-inside-your-oracle-jvm.html
>>>>>>>> Is Oracle 11g REST ready?
>>>>>>>>
>>>>>>>> http://marceloochoa.blogspot.com/2008/02/is-oracle-11g-rest-ready.html
>>>>>>>>
>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>>
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