Hello Friends;

Recently, I have problem with lucene search - memory problem on the basis that indexed file is so big. (I have indexed some kinds of information and this indexed file's size is nearly more than 40 gigabyte. ) 

I search the lucene indexed file with org.apache.lucene.search.Searcher.search(query, null, offset + limit, new Sort(new SortField("time", SortField.LONG, true)));
(This provides to find (offset + limit) records to back.)

I use searching by range. For example, in web page I firstly search records which are in [0, 100] range then second page [100, 200] 
I have nearly 200,000 records at all. When I go to last page which means records between 200,000 -100, 200,0, there is a memory problem(I have 4gb ram on running machine) in jvm( out of memory error).

Is there a way to overcome this memory problem?

Thanks

--
ilkay POLAT   Software Engineer
TURKEY
 
  Gsm : (+90) 532 542 36 71
  E-mail : [EMAIL PROTECTED]

Certainly it will. Either you need to increase your memory OR refine your
query. Eventhough you display paginated result. The first couple of pages
will display fine and going towards last may face problem. This is because,
200,000 objects is created and iterated, 190,900 objects are skipped and
last100 objects are returned. The memory is consumed in creating these
objects.

Regards
Aditya
www.findbestopensource.com

On Wed, Jul 14, 2010 at 4:14 PM, ilkay polat <[EMAIL PROTECTED]> wrote:

> Hello Friends;
>
> Recently, I have problem with lucene search - memory problem on the basis
> that indexed file is so big. (I have indexed some kinds of information and
> this indexed file's size is nearly more than 40 gigabyte. )
>
> I search the lucene indexed file with
> org.apache.lucene.search.Searcher.search(query, null, offset + limit, new
> Sort(new SortField("time", SortField.LONG, true)));
> (This provides to find (offset + limit) records to back.)
>
> I use searching by range. For example, in web page I firstly search records
> which are in [0, 100] range then second page [100, 200]
> I have nearly 200,000 records at all. When I go to last page which means
> records between 200,000 -100, 200,0, there is a memory problem(I have 4gb
> ram on running machine) in jvm( out of memory error).
>
> Is there a way to overcome this memory problem?
>
> Thanks
>
> --
> ilkay POLAT   Software Engineer
> TURKEY
>
>  Gsm : (+90) 532 542 36 71
>  E-mail : [EMAIL PROTECTED]
>
>
>

Reverse the query sorting to display the last page.

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: [EMAIL PROTECTED]
> -----Original Message-----
> From: ilkay polat [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, July 14, 2010 12:44 PM
> To: [EMAIL PROTECTED]
> Subject: Out of memory problem in search
>
> Hello Friends;
>
> Recently, I have problem with lucene search - memory problem on the basis
> that indexed file is so big. (I have indexed some kinds of information and
this
> indexed file's size is nearly more than 40 gigabyte. )
>
> I search the lucene indexed file with
> org.apache.lucene.search.Searcher.search(query, null, offset + limit, new
> Sort(new SortField("time", SortField.LONG, true))); (This provides to find
> (offset + limit) records to back.)
>
> I use searching by range. For example, in web page I firstly search
records
> which are in [0, 100] range then second page [100, 200] I have nearly
200,000
> records at all. When I go to last page which means records between 200,000
-
> 100, 200,0, there is a memory problem(I have 4gb ram on running machine)
in
> jvm( out of memory error).
>
> Is there a way to overcome this memory problem?
>
> Thanks
>
> --
> ilkay POLAT   Software Engineer
> TURKEY
>
>   Gsm : (+90) 532 542 36 71
>   E-mail : [EMAIL PROTECTED]
>
>
>
---------------------------------------------------------------------

Indeed, this is  good solution to that kind of problems. But same problem can be  occured in future when logs are added to index file.
For example, here 200,000 records have problem(These logs are collected in 13 days).
With that reverse way, there will be maximum search range is 100,000.
But if there is 400,000 records same problem will be occured(Max search space is 200,000 again).
Is there another way which do not consume so much memory  or consume restrict memory and consume time instead of memory. This restriction come from our project hardware restrictions(Hardware memory is 8GB in maximum situation)?

--- On Wed, 7/14/10, Uwe Schindler <[EMAIL PROTECTED]> wrote:

From: Uwe Schindler <[EMAIL PROTECTED]>
Subject: RE: Out of memory problem in search
To: [EMAIL PROTECTED]
Date: Wednesday, July 14, 2010, 3:25 PM

Reverse the query sorting to display the last page.

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: [EMAIL PROTECTED]
> -----Original Message-----
> From: ilkay polat [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, July 14, 2010 12:44 PM
> To: [EMAIL PROTECTED]
> Subject: Out of memory problem in search
>
> Hello Friends;
>
> Recently, I have problem with lucene search - memory problem on the basis
> that indexed file is so big. (I have indexed some kinds of information and
this
> indexed file's size is nearly more than 40 gigabyte. )
>
> I search the lucene indexed file with
> org.apache.lucene.search.Searcher.search(query, null, offset + limit, new
> Sort(new SortField("time", SortField.LONG, true))); (This provides to find
> (offset + limit) records to back.)
>
> I use searching by range. For example, in web page I firstly search
records
> which are in [0, 100] range then second page [100, 200] I have nearly
200,000
> records at all. When I go to last page which means records between 200,000
-
> 100, 200,0, there is a memory problem(I have 4gb ram on running machine)
in
> jvm( out of memory error).
>
> Is there a way to overcome this memory problem?
>
> Thanks
>
> --
> ilkay POLAT   Software Engineer
> TURKEY
>
>   Gsm : (+90) 532 542 36 71
>   E-mail : [EMAIL PROTECTED]
>
>
>
---------------------------------------------------------------------

Hi,
We have hardware restrictions(Max RAM can be  8GB). So, unfortunately,  increasing memory can not be option for us for today's situation.

Yes, as you said that problem is faced when goes to last pages of search screen because of using search method which is find top n records. In other way, this is meaning "searching all the thinngs returns all".

I am now researching whether there is a way which consumes time instead of memory in this search mechanism in lucene? Any other ideas?

Thanks

--- On Wed, 7/14/10, findbestopensource <[EMAIL PROTECTED]> wrote:

From: findbestopensource <[EMAIL PROTECTED]>
Subject: Re: Out of memory problem in search
To: [EMAIL PROTECTED]
Date: Wednesday, July 14, 2010, 2:59 PM

Certainly it will. Either you need to increase your memory OR refine your
query. Eventhough you display paginated result. The first couple of pages
will display fine and going towards last may face problem. This is because,
200,000 objects is created and iterated, 190,900 objects are skipped and
last100 objects are returned. The memory is consumed in creating these
objects.

Regards
Aditya
www.findbestopensource.com

On Wed, Jul 14, 2010 at 4:14 PM, ilkay polat <[EMAIL PROTECTED]> wrote:

> Hello Friends;
>
> Recently, I have problem with lucene search - memory problem on the basis
> that indexed file is so big. (I have indexed some kinds of information and
> this indexed file's size is nearly more than 40 gigabyte. )
>
> I search the lucene indexed file with
> org.apache.lucene.search.Searcher.search(query, null, offset + limit, new
> Sort(new SortField("time", SortField.LONG, true)));
> (This provides to find (offset + limit) records to back.)
>
> I use searching by range. For example, in web page I firstly search records
> which are in [0, 100] range then second page [100, 200]
> I have nearly 200,000 records at all. When I go to last page which means
> records between 200,000 -100, 200,0, there is a memory problem(I have 4gb
> ram on running machine) in jvm( out of memory error).
>
> Is there a way to overcome this memory problem?
>
> Thanks
>
> --
> ilkay POLAT   Software Engineer
> TURKEY
>
>  Gsm : (+90) 532 542 36 71
>  E-mail : [EMAIL PROTECTED]
>
>
>

I have also  confused about the memory management of lucene.

Where is this out of memory problem is mainly arised from Reason-1 or Reason-2 reason?
 
Reason-1 : Problem is sourced from searching is done in big indexed file (nearly 40 GB) If there is 100(small number of records) records returned from search in 60 GB indexed file, problem will again arised.
OR
Reason-2 : Problem is sourced from finding so many records(nearly 200,000 records), so in memory 200, 000 java object in heap? If file's sizeis 10 GB(small file size ) but returned records are so many, problem will again arised.

Is there any document which tells the general memory management issues in searching in lucene?

Thanks

 
ilkay POLAT     Software Engineer   Gsm : (+90) 532 542 36 71
  E-mail : [EMAIL PROTECTED]

--- On Wed, 7/14/10, ilkay polat <[EMAIL PROTECTED]> wrote:

From: ilkay polat <[EMAIL PROTECTED]>
Subject: Re: Out of memory problem in search
To: [EMAIL PROTECTED]
Date: Wednesday, July 14, 2010, 3:54 PM

Hi,
We have hardware restrictions(Max RAM can be  8GB). So, unfortunately,  increasing memory can not be option for us for today's situation.

Yes, as you said that problem is faced when goes to last pages of search screen because of using search method which is find top n records. In other way, this is meaning "searching all the thinngs returns all".

I am now researching whether there is a way which consumes time instead of memory in this search mechanism in lucene? Any other ideas?

Thanks

--- On Wed, 7/14/10, findbestopensource <[EMAIL PROTECTED]> wrote:

From: findbestopensource <[EMAIL PROTECTED]>
Subject: Re: Out of memory problem in search
To: [EMAIL PROTECTED]
Date: Wednesday, July 14, 2010, 2:59 PM

Certainly it will. Either you need to increase your memory OR refine your
query. Eventhough you display paginated result. The first couple of pages
will display fine and going towards last may face problem. This is because,
200,000 objects is created and iterated, 190,900 objects are skipped and
last100 objects are returned. The memory is consumed in creating these
objects.

Regards
Aditya
www.findbestopensource.com

On Wed, Jul 14, 2010 at 4:14 PM, ilkay polat <[EMAIL PROTECTED]> wrote:

> Hello Friends;
>
> Recently, I have problem with lucene search - memory problem on the basis
> that indexed file is so big. (I have indexed some kinds of information and
> this indexed file's size is nearly more than 40 gigabyte. )
>
> I search the lucene indexed file with
> org.apache.lucene.search.Searcher.search(query, null, offset + limit, new
> Sort(new SortField("time", SortField.LONG, true)));
> (This provides to find (offset + limit) records to back.)
>
> I use searching by range. For example, in web page I firstly search records
> which are in [0, 100] range then second page [100, 200]
> I have nearly 200,000 records at all. When I go to last page which means
> records between 200,000 -100, 200,0, there is a memory problem(I have 4gb
> ram on running machine) in jvm( out of memory error).
>
> Is there a way to overcome this memory problem?
>
> Thanks
>
> --
> ilkay POLAT   Software Engineer
> TURKEY
>
>  Gsm : (+90) 532 542 36 71
>  E-mail : [EMAIL PROTECTED]
>
>
>

     

This doesn't make sense to me. Are you saying that you only have 200,000
documents in your index? Because keeping a score for 200K documents should
consume a relatively trivial amount of memory. The fact that you're sorting
by time is a red flag, but it's only a long, so 200K documents shouldn't
strain memory due to sorting either. The critical thing here isn't
necessarily the size of your index, but the number of documents in that
index and the number of unique values you're sorting by. By the way, what
happens if you don't sort?

Since it doesn't make sense to me, that must mean I don't understand the
problem very thoroughly. Could you provide some index characteristics?
Saying it's 40G leaves a lot open to speculation. That could be 39G of
stored text which is mostly irrelevant for searching. Or it could be
entirely indexed, tokenized data which would be a different thing. How many
documents do you have in your index? What does your query look like?

You can get an idea of the amount of your index holding indexed tokens by
NOT storing any of the fields, just indexing them (Field.Store.NO)

What version of Lucene are you using? How do you start your process? If you
start the application with java's default memory, that's not very much (64M
if memory serves). You may be using nowhere near your hardware limits. Try
specifying -Xmx512M and/or the -server option.

Best
Erick

On Wed, Jul 14, 2010 at 9:27 AM, ilkay polat <[EMAIL PROTECTED]> wrote:

> I have also  confused about the memory management of lucene.
>
> Where is this out of memory problem is mainly arised from Reason-1 or
> Reason-2 reason?
>
> Reason-1 : Problem is sourced from searching is done in big indexed file
> (nearly 40 GB) If there is 100(small number of records) records returned
> from search in 60 GB indexed file, problem will again arised.
> OR
> Reason-2 : Problem is sourced from finding so many records(nearly 200,000
> records), so in memory 200, 000 java object in heap? If file's sizeis 10
> GB(small file size ) but returned records are so many, problem will again
> arised.
>
> Is there any document which tells the general memory management issues in
> searching in lucene?
>
> Thanks
>
>
> ilkay POLAT     Software Engineer   Gsm : (+90) 532 542 36 71
>   E-mail : [EMAIL PROTECTED]
>
> --- On Wed, 7/14/10, ilkay polat <[EMAIL PROTECTED]> wrote:
>
> From: ilkay polat <[EMAIL PROTECTED]>
> Subject: Re: Out of memory problem in search
> To: [EMAIL PROTECTED]
> Date: Wednesday, July 14, 2010, 3:54 PM
>
> Hi,
> We have hardware restrictions(Max RAM can be  8GB). So, unfortunately,
> increasing memory can not be option for us for today's situation.
>
> Yes, as you said that problem is faced when goes to last pages of search
> screen because of using search method which is find top n records. In other
> way, this is meaning "searching all the thinngs returns all".
>
> I am now researching whether there is a way which consumes time instead of
> memory in this search mechanism in lucene? Any other ideas?
>
> Thanks
>
> --- On Wed, 7/14/10, findbestopensource <[EMAIL PROTECTED]>
> wrote:
>
> From: findbestopensource <[EMAIL PROTECTED]>
> Subject: Re: Out of memory problem in search
> To: [EMAIL PROTECTED]
> Date: Wednesday, July 14, 2010, 2:59 PM
>
> Certainly it will. Either you need to increase your memory OR refine your
> query. Eventhough you display paginated result. The first couple of pages
> will display fine and going towards last may face problem. This is because,
> 200,000 objects is created and iterated, 190,900 objects are skipped and
> last100 objects are returned. The memory is consumed in creating these
> objects.
>
> Regards
> Aditya
> www.findbestopensource.com
>
>
>
> On Wed, Jul 14, 2010 at 4:14 PM, ilkay polat <[EMAIL PROTECTED]>
> wrote:
>
> > Hello Friends;
> >
> > Recently, I have problem with lucene search - memory problem on the basis
> > that indexed file is so big. (I have indexed some kinds of information