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From Michael McCandless <>
Subject Re: IndexWriter and IndexReader in a shared environment
Date Wed, 14 Dec 2016 19:21:55 GMT
Since the last time you called IW.commit, yes.

IW.commit also determines visibility to IndexReaders opened on that
same directory.

Mike McCandless

On Wed, Dec 14, 2016 at 1:05 PM, Siraj Haider <> wrote:
> Hi Mike,
> You said "periodically calling IW.commit when you need durability". Does it mean that
if the program dies without calling the IW.commit() all the index changes would be lost that
were not commited?
> ------
> Regards
> -Siraj Haider
> (212) 306-0154
> -----Original Message-----
> From: Michael McCandless []
> Sent: Thursday, July 07, 2016 8:52 AM
> To: Lucene Users <>;
> Subject: Re: IndexWriter and IndexReader in a shared environment
> The API is pretty simple.
> Create IndexWriter and leave it open forever, using it to index/delete documents, and
periodically calling IW.commit when you need durability.
> Create a SearcherManager, passing it the IndexWriter, and use it per-search to acquire/release
the searcher.  Periodically (ideally from a separate
> thread) call SM.maybeRefresh so the searcher sees the latest indexing changes.
> Mike McCandless
> On Tue, Jul 5, 2016 at 9:36 AM, Desteny Child <> wrote:
>> Hi,
>> In my Spring Boot application I have implemented 2 API endpoints - one
>> for Lucene(I use 5.2.1) document indexing and another one for searching.
>> Right now I open every time on each request IndexWriter and IndexReader.
>> With a big index it works pretty slow.
>> I know that there is a possibility to use single IndexWriter  and
>> IndexReader in a shared environment. There is SearcherManager or
>> something like this for this purpose.
>> I can't find a good example for this for Lucene 5. Could you please
>> share with me this example ?
>> Thanks in advance,
>> Alex
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