[JOB] Full-time opportunity in Paris, France

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[JOB] Full-time opportunity in Paris, France

nicolas.dessaigne
Arisem is a French ISV delivering best-of-breed text analytics software. We
are using Lucene in our products since 2001 and are in search of a Lucene
expert to complement our R&D team.

 

Required skills:

- Master degree in computer science

- 2+ years of experience in working with Lucene

- Strong design and coding skills in Java on Linux platforms

- Strong desire to work in an environment combining development and research

- Innovation and excellent communication skills

 

Fluency in French is a plus.

Ideal candidates will also have an experience in research and skills in text
mining and NLP. Familiarity with C++, SOLR and Eclipse is also desired.

 

If you are available and interested, please contact me directly at
nicolas.dessaigne_at_arisem.com

 

Nicolas Dessaigne

Chief Technical Officer

ARISEM

 

 

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dataset parameters suitable for lucene application

Law, John
I am new to the list and new to lucene and solr. I am considering Lucene
for a potential new application and need to know how well it scales.

Following are the parameters of the dataset.

Number of records: 7+ million
Database size: 13.3 GB
Index Size:  10.9 GB

My questions are simply:

1) Approximately how long would it take Lucene to index these documents?
2) What would the approximate retrieval time be (i.e. search response
time)?

Can someone provide me with some informed guidance in this regard?

Thanks in advance,
John

______________________________________________
John Law
Director, Platform Management
ProQuest
789 Eisenhower Parkway
Ann Arbor, MI 48106
734-997-4877
[hidden email]
www.proquest.com
www.csa.com

ProQuest... Start here.



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Re: dataset parameters suitable for lucene application

Walter Underwood, Netflix
That seems well within Solr's capabilities, though you should come up
with a desired queries/sec figure.

Solr's query rate varies widely with the configuration -- how many
fields, fuzzy search, highlighting, facets, etc.

Essentially, Solr uses Lucene, a modern search core. It has performance
and scaling comparable to the commercial products I know about, and I was
building enterprise search for nine years. If you need to search over
100M docs or over 1000 queries/second, you may need fancier distributed
search than is available in Solr or commercially.

Solr's big weaknesses are the quality of the stemmers, parsing document
formats (PDF, MS Word), and access control on queries. If you can live
with the stemmers, Solr will probably do the job.

I worked at Infoseek, Inktomi, Verity, and Autonomy, and I'm using
Solr here at Netflix.

wunder

On 9/26/07 7:27 AM, "Law, John" <[hidden email]> wrote:

> I am new to the list and new to lucene and solr. I am considering Lucene
> for a potential new application and need to know how well it scales.
>
> Following are the parameters of the dataset.
>
> Number of records: 7+ million
> Database size: 13.3 GB
> Index Size:  10.9 GB
>
> My questions are simply:
>
> 1) Approximately how long would it take Lucene to index these documents?
> 2) What would the approximate retrieval time be (i.e. search response
> time)?
>
> Can someone provide me with some informed guidance in this regard?
>
> Thanks in advance,
> John
>
> ______________________________________________
> John Law
> Director, Platform Management
> ProQuest
> 789 Eisenhower Parkway
> Ann Arbor, MI 48106
> 734-997-4877
> [hidden email]
> www.proquest.com
> www.csa.com
>
> ProQuest... Start here.


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RE: dataset parameters suitable for lucene application

Charlie Jackson
In reply to this post by Law, John
My experiences so far with this level of data have been good.

Number of records: Maxed out at 8.8 million
Database size: friggin huge (100+ GB)
Index size: ~24 GB

1) It took me about a day to index 8 million docs using a non-optimized
program I wrote. It's non-optimized in the sense that it's not
multi-threaded. It batched together groups of about 5,000 docs at a time
to be indexed.

2) Search times for a basic search are almost always sub-second. If we
toss in some faceting, it takes a little longer, but I've hardly ever
seen it go above 1-2 seconds even with the most advanced queries.

Hope that helps.


Charlie

____________________________________________

-----Original Message-----
From: Law, John [mailto:[hidden email]]
Sent: Wednesday, September 26, 2007 9:28 AM
To: [hidden email]
Subject: dataset parameters suitable for lucene application

I am new to the list and new to lucene and solr. I am considering Lucene
for a potential new application and need to know how well it scales.

Following are the parameters of the dataset.

Number of records: 7+ million
Database size: 13.3 GB
Index Size:  10.9 GB

My questions are simply:

1) Approximately how long would it take Lucene to index these documents?
2) What would the approximate retrieval time be (i.e. search response
time)?

Can someone provide me with some informed guidance in this regard?

Thanks in advance,
John

______________________________________________
John Law
Director, Platform Management
ProQuest
789 Eisenhower Parkway
Ann Arbor, MI 48106
734-997-4877
[hidden email]
www.proquest.com
www.csa.com

ProQuest... Start here.



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Re: dataset parameters suitable for lucene application

Chris Harris-2
By "maxed out" do you mean that Solr's performance became unacceptable
beyond 8.8M records, or that you only had 8.8M records to index? If
the former, can you share the particular symptoms?

On 9/26/07, Charlie Jackson <[hidden email]> wrote:

> My experiences so far with this level of data have been good.
>
> Number of records: Maxed out at 8.8 million
> Database size: friggin huge (100+ GB)
> Index size: ~24 GB
>
> 1) It took me about a day to index 8 million docs using a non-optimized
> program I wrote. It's non-optimized in the sense that it's not
> multi-threaded. It batched together groups of about 5,000 docs at a time
> to be indexed.
>
> 2) Search times for a basic search are almost always sub-second. If we
> toss in some faceting, it takes a little longer, but I've hardly ever
> seen it go above 1-2 seconds even with the most advanced queries.
>
> Hope that helps.
>
>
> Charlie
>
> ____________________________________________
>
> -----Original Message-----
> From: Law, John [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 9:28 AM
> To: [hidden email]
> Subject: dataset parameters suitable for lucene application
>
> I am new to the list and new to lucene and solr. I am considering Lucene
> for a potential new application and need to know how well it scales.
>
> Following are the parameters of the dataset.
>
> Number of records: 7+ million
> Database size: 13.3 GB
> Index Size:  10.9 GB
>
> My questions are simply:
>
> 1) Approximately how long would it take Lucene to index these documents?
> 2) What would the approximate retrieval time be (i.e. search response
> time)?
>
> Can someone provide me with some informed guidance in this regard?
>
> Thanks in advance,
> John
>
> ______________________________________________
> John Law
> Director, Platform Management
> ProQuest
> 789 Eisenhower Parkway
> Ann Arbor, MI 48106
> 734-997-4877
> [hidden email]
> www.proquest.com
> www.csa.com
>
> ProQuest... Start here.
>
>
>
>
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RE: dataset parameters suitable for lucene application

Xuesong Luo
In reply to this post by Charlie Jackson
My experience so far:
200k number of indexes were created in 90 mins(including db time), index
size is 200m, query a key word on all string fields(30) takes 0.3-1 sec,
query a key word on one field takes tens of mill seconds.



-----Original Message-----
From: Charlie Jackson [mailto:[hidden email]]
Sent: Wednesday, September 26, 2007 8:53 AM
To: [hidden email]
Subject: RE: dataset parameters suitable for lucene application

My experiences so far with this level of data have been good.

Number of records: Maxed out at 8.8 million
Database size: friggin huge (100+ GB)
Index size: ~24 GB

1) It took me about a day to index 8 million docs using a non-optimized
program I wrote. It's non-optimized in the sense that it's not
multi-threaded. It batched together groups of about 5,000 docs at a time
to be indexed.

2) Search times for a basic search are almost always sub-second. If we
toss in some faceting, it takes a little longer, but I've hardly ever
seen it go above 1-2 seconds even with the most advanced queries.

Hope that helps.


Charlie

____________________________________________

-----Original Message-----
From: Law, John [mailto:[hidden email]]
Sent: Wednesday, September 26, 2007 9:28 AM
To: [hidden email]
Subject: dataset parameters suitable for lucene application

I am new to the list and new to lucene and solr. I am considering Lucene
for a potential new application and need to know how well it scales.

Following are the parameters of the dataset.

Number of records: 7+ million
Database size: 13.3 GB
Index Size:  10.9 GB

My questions are simply:

1) Approximately how long would it take Lucene to index these documents?
2) What would the approximate retrieval time be (i.e. search response
time)?

Can someone provide me with some informed guidance in this regard?

Thanks in advance,
John

______________________________________________
John Law
Director, Platform Management
ProQuest
789 Eisenhower Parkway
Ann Arbor, MI 48106
734-997-4877
[hidden email]
www.proquest.com
www.csa.com

ProQuest... Start here.


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RE: dataset parameters suitable for lucene application

Charlie Jackson
In reply to this post by Chris Harris-2
Sorry, I meant that it maxed out in the sense that my maxDoc field on
the stats page was 8.8 million, which indicates that the most docs it
has ever had was around 8.8 million. It's down to about 7.8 million
currently. I have seen no signs of a "maximum" number of docs Solr can
handle.


-----Original Message-----
From: Chris Harris [mailto:[hidden email]]
Sent: Wednesday, September 26, 2007 11:49 AM
To: [hidden email]
Subject: Re: dataset parameters suitable for lucene application

By "maxed out" do you mean that Solr's performance became unacceptable
beyond 8.8M records, or that you only had 8.8M records to index? If
the former, can you share the particular symptoms?

On 9/26/07, Charlie Jackson <[hidden email]> wrote:
> My experiences so far with this level of data have been good.
>
> Number of records: Maxed out at 8.8 million
> Database size: friggin huge (100+ GB)
> Index size: ~24 GB
>
> 1) It took me about a day to index 8 million docs using a
non-optimized
> program I wrote. It's non-optimized in the sense that it's not
> multi-threaded. It batched together groups of about 5,000 docs at a
time

> to be indexed.
>
> 2) Search times for a basic search are almost always sub-second. If we
> toss in some faceting, it takes a little longer, but I've hardly ever
> seen it go above 1-2 seconds even with the most advanced queries.
>
> Hope that helps.
>
>
> Charlie
>
> ____________________________________________
>
> -----Original Message-----
> From: Law, John [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 9:28 AM
> To: [hidden email]
> Subject: dataset parameters suitable for lucene application
>
> I am new to the list and new to lucene and solr. I am considering
Lucene

> for a potential new application and need to know how well it scales.
>
> Following are the parameters of the dataset.
>
> Number of records: 7+ million
> Database size: 13.3 GB
> Index Size:  10.9 GB
>
> My questions are simply:
>
> 1) Approximately how long would it take Lucene to index these
documents?

> 2) What would the approximate retrieval time be (i.e. search response
> time)?
>
> Can someone provide me with some informed guidance in this regard?
>
> Thanks in advance,
> John
>
> ______________________________________________
> John Law
> Director, Platform Management
> ProQuest
> 789 Eisenhower Parkway
> Ann Arbor, MI 48106
> 734-997-4877
> [hidden email]
> www.proquest.com
> www.csa.com
>
> ProQuest... Start here.
>
>
>
>
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RE: dataset parameters suitable for lucene application

Law, John
Thanks all! One last question...

If I had a collection of 2.5 billion docs and a demand averaging 200
queries per second, what's the confidence that Solr/Lucene could handle
this volume and execute search with sub-second response times?


-----Original Message-----
From: Charlie Jackson [mailto:[hidden email]]
Sent: Wednesday, September 26, 2007 1:32 PM
To: [hidden email]
Subject: RE: dataset parameters suitable for lucene application

Sorry, I meant that it maxed out in the sense that my maxDoc field on
the stats page was 8.8 million, which indicates that the most docs it
has ever had was around 8.8 million. It's down to about 7.8 million
currently. I have seen no signs of a "maximum" number of docs Solr can
handle.


-----Original Message-----
From: Chris Harris [mailto:[hidden email]]
Sent: Wednesday, September 26, 2007 11:49 AM
To: [hidden email]
Subject: Re: dataset parameters suitable for lucene application

By "maxed out" do you mean that Solr's performance became unacceptable
beyond 8.8M records, or that you only had 8.8M records to index? If
the former, can you share the particular symptoms?

On 9/26/07, Charlie Jackson <[hidden email]> wrote:
> My experiences so far with this level of data have been good.
>
> Number of records: Maxed out at 8.8 million
> Database size: friggin huge (100+ GB)
> Index size: ~24 GB
>
> 1) It took me about a day to index 8 million docs using a
non-optimized
> program I wrote. It's non-optimized in the sense that it's not
> multi-threaded. It batched together groups of about 5,000 docs at a
time

> to be indexed.
>
> 2) Search times for a basic search are almost always sub-second. If we
> toss in some faceting, it takes a little longer, but I've hardly ever
> seen it go above 1-2 seconds even with the most advanced queries.
>
> Hope that helps.
>
>
> Charlie
>
> ____________________________________________
>
> -----Original Message-----
> From: Law, John [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 9:28 AM
> To: [hidden email]
> Subject: dataset parameters suitable for lucene application
>
> I am new to the list and new to lucene and solr. I am considering
Lucene

> for a potential new application and need to know how well it scales.
>
> Following are the parameters of the dataset.
>
> Number of records: 7+ million
> Database size: 13.3 GB
> Index Size:  10.9 GB
>
> My questions are simply:
>
> 1) Approximately how long would it take Lucene to index these
documents?

> 2) What would the approximate retrieval time be (i.e. search response
> time)?
>
> Can someone provide me with some informed guidance in this regard?
>
> Thanks in advance,
> John
>
> ______________________________________________
> John Law
> Director, Platform Management
> ProQuest
> 789 Eisenhower Parkway
> Ann Arbor, MI 48106
> 734-997-4877
> [hidden email]
> www.proquest.com
> www.csa.com
>
> ProQuest... Start here.
>
>
>
>
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Re: dataset parameters suitable for lucene application

Walter Underwood, Netflix
No one can answer that, because it depends on how you configure Solr.
How many fields do you want to search? Are you using fuzzy search?
Facets? Highlighting?

We are searching a much smaller collection, about 250K docs, with
great success. We see 80 queries/sec on each of four servers, and
response times under 100ms. Each query searches against seven
fields and we don't use any of the features I listed above.

wunder

On 9/26/07 10:50 AM, "Law, John" <[hidden email]> wrote:

> Thanks all! One last question...
>
> If I had a collection of 2.5 billion docs and a demand averaging 200
> queries per second, what's the confidence that Solr/Lucene could handle
> this volume and execute search with sub-second response times?
>
>
> -----Original Message-----
> From: Charlie Jackson [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 1:32 PM
> To: [hidden email]
> Subject: RE: dataset parameters suitable for lucene application
>
> Sorry, I meant that it maxed out in the sense that my maxDoc field on
> the stats page was 8.8 million, which indicates that the most docs it
> has ever had was around 8.8 million. It's down to about 7.8 million
> currently. I have seen no signs of a "maximum" number of docs Solr can
> handle.
>
>
> -----Original Message-----
> From: Chris Harris [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 11:49 AM
> To: [hidden email]
> Subject: Re: dataset parameters suitable for lucene application
>
> By "maxed out" do you mean that Solr's performance became unacceptable
> beyond 8.8M records, or that you only had 8.8M records to index? If
> the former, can you share the particular symptoms?
>
> On 9/26/07, Charlie Jackson <[hidden email]> wrote:
>> My experiences so far with this level of data have been good.
>>
>> Number of records: Maxed out at 8.8 million
>> Database size: friggin huge (100+ GB)
>> Index size: ~24 GB
>>
>> 1) It took me about a day to index 8 million docs using a
> non-optimized
>> program I wrote. It's non-optimized in the sense that it's not
>> multi-threaded. It batched together groups of about 5,000 docs at a
> time
>> to be indexed.
>>
>> 2) Search times for a basic search are almost always sub-second. If we
>> toss in some faceting, it takes a little longer, but I've hardly ever
>> seen it go above 1-2 seconds even with the most advanced queries.
>>
>> Hope that helps.
>>
>>
>> Charlie
>>
>> ____________________________________________
>>
>> -----Original Message-----
>> From: Law, John [mailto:[hidden email]]
>> Sent: Wednesday, September 26, 2007 9:28 AM
>> To: [hidden email]
>> Subject: dataset parameters suitable for lucene application
>>
>> I am new to the list and new to lucene and solr. I am considering
> Lucene
>> for a potential new application and need to know how well it scales.
>>
>> Following are the parameters of the dataset.
>>
>> Number of records: 7+ million
>> Database size: 13.3 GB
>> Index Size:  10.9 GB
>>
>> My questions are simply:
>>
>> 1) Approximately how long would it take Lucene to index these
> documents?
>> 2) What would the approximate retrieval time be (i.e. search response
>> time)?
>>
>> Can someone provide me with some informed guidance in this regard?
>>
>> Thanks in advance,
>> John
>>
>> ______________________________________________
>> John Law
>> Director, Platform Management
>> ProQuest
>> 789 Eisenhower Parkway
>> Ann Arbor, MI 48106
>> 734-997-4877
>> [hidden email]
>> www.proquest.com
>> www.csa.com
>>
>> ProQuest... Start here.
>>
>>
>>
>>

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RE: dataset parameters suitable for lucene application

Lance Norskog-2
My limited experience with larger indexes is:  
1) the logistics of copying around and backing up this much data, and
2) indexing is disk-bound. We're on SAS disks and it makes no difference
between one indexing thread and a dozen (we have small records).

Smaller returns are faster. You need to limit the search results via as many
parameters as you can, and filters are the way to do this.

-----Original Message-----
From: Walter Underwood [mailto:[hidden email]]
Sent: Wednesday, September 26, 2007 10:58 AM
To: [hidden email]
Subject: Re: dataset parameters suitable for lucene application

No one can answer that, because it depends on how you configure Solr.
How many fields do you want to search? Are you using fuzzy search?
Facets? Highlighting?

We are searching a much smaller collection, about 250K docs, with great
success. We see 80 queries/sec on each of four servers, and response times
under 100ms. Each query searches against seven fields and we don't use any
of the features I listed above.

wunder

On 9/26/07 10:50 AM, "Law, John" <[hidden email]> wrote:

> Thanks all! One last question...
>
> If I had a collection of 2.5 billion docs and a demand averaging 200
> queries per second, what's the confidence that Solr/Lucene could
> handle this volume and execute search with sub-second response times?
>
>
> -----Original Message-----
> From: Charlie Jackson [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 1:32 PM
> To: [hidden email]
> Subject: RE: dataset parameters suitable for lucene application
>
> Sorry, I meant that it maxed out in the sense that my maxDoc field on
> the stats page was 8.8 million, which indicates that the most docs it
> has ever had was around 8.8 million. It's down to about 7.8 million
> currently. I have seen no signs of a "maximum" number of docs Solr can
> handle.
>
>
> -----Original Message-----
> From: Chris Harris [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 11:49 AM
> To: [hidden email]
> Subject: Re: dataset parameters suitable for lucene application
>
> By "maxed out" do you mean that Solr's performance became unacceptable
> beyond 8.8M records, or that you only had 8.8M records to index? If
> the former, can you share the particular symptoms?
>
> On 9/26/07, Charlie Jackson <[hidden email]> wrote:
>> My experiences so far with this level of data have been good.
>>
>> Number of records: Maxed out at 8.8 million Database size: friggin
>> huge (100+ GB) Index size: ~24 GB
>>
>> 1) It took me about a day to index 8 million docs using a
> non-optimized
>> program I wrote. It's non-optimized in the sense that it's not
>> multi-threaded. It batched together groups of about 5,000 docs at a
> time
>> to be indexed.
>>
>> 2) Search times for a basic search are almost always sub-second. If
>> we toss in some faceting, it takes a little longer, but I've hardly
>> ever seen it go above 1-2 seconds even with the most advanced queries.
>>
>> Hope that helps.
>>
>>
>> Charlie
>>
>> ____________________________________________
>>
>> -----Original Message-----
>> From: Law, John [mailto:[hidden email]]
>> Sent: Wednesday, September 26, 2007 9:28 AM
>> To: [hidden email]
>> Subject: dataset parameters suitable for lucene application
>>
>> I am new to the list and new to lucene and solr. I am considering
> Lucene
>> for a potential new application and need to know how well it scales.
>>
>> Following are the parameters of the dataset.
>>
>> Number of records: 7+ million
>> Database size: 13.3 GB
>> Index Size:  10.9 GB
>>
>> My questions are simply:
>>
>> 1) Approximately how long would it take Lucene to index these
> documents?
>> 2) What would the approximate retrieval time be (i.e. search response
>> time)?
>>
>> Can someone provide me with some informed guidance in this regard?
>>
>> Thanks in advance,
>> John
>>
>> ______________________________________________
>> John Law
>> Director, Platform Management
>> ProQuest
>> 789 Eisenhower Parkway
>> Ann Arbor, MI 48106
>> 734-997-4877
>> [hidden email]
>> www.proquest.com
>> www.csa.com
>>
>> ProQuest... Start here.
>>
>>
>>
>>

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Re: dataset parameters suitable for lucene application

Mike Klaas
In reply to this post by Law, John
On 26-Sep-07, at 10:50 AM, Law, John wrote:

> Thanks all! One last question...
>
> If I had a collection of 2.5 billion docs and a demand averaging 200
> queries per second, what's the confidence that Solr/Lucene could  
> handle
> this volume and execute search with sub-second response times?

No search software can search 2.5 billion docs (assuming web-sized  
documents) in 5ms on a single server.

You certainly could build such a system with Solr distributed over  
100's of nodes, but this is not built into Solr currently.

-Mike
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Re: dataset parameters suitable for lucene application

Chris Harris-2
In reply to this post by Xuesong Luo
Hi There,

Would you mind if I pasted your data onto the wiki page at

http://wiki.apache.org/solr/SolrPerformanceData

I think it would be helpful to get some more numbers on that page, so
people can help decide if Solr is the right application for them.

Thanks,
Chris Harris, new Solr user

On 9/26/07, Xuesong Luo <[hidden email]> wrote:

> My experience so far:
> 200k number of indexes were created in 90 mins(including db time), index
> size is 200m, query a key word on all string fields(30) takes 0.3-1 sec,
> query a key word on one field takes tens of mill seconds.
>
>
>
> -----Original Message-----
> From: Charlie Jackson [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 8:53 AM
> To: [hidden email]
> Subject: RE: dataset parameters suitable for lucene application
>
> My experiences so far with this level of data have been good.
>
> Number of records: Maxed out at 8.8 million
> Database size: friggin huge (100+ GB)
> Index size: ~24 GB
>
> 1) It took me about a day to index 8 million docs using a non-optimized
> program I wrote. It's non-optimized in the sense that it's not
> multi-threaded. It batched together groups of about 5,000 docs at a time
> to be indexed.
>
> 2) Search times for a basic search are almost always sub-second. If we
> toss in some faceting, it takes a little longer, but I've hardly ever
> seen it go above 1-2 seconds even with the most advanced queries.
>
> Hope that helps.
>
>
> Charlie
>
> ____________________________________________
>
> -----Original Message-----
> From: Law, John [mailto:[hidden email]]
> Sent: Wednesday, September 26, 2007 9:28 AM
> To: [hidden email]
> Subject: dataset parameters suitable for lucene application
>
> I am new to the list and new to lucene and solr. I am considering Lucene
> for a potential new application and need to know how well it scales.
>
> Following are the parameters of the dataset.
>
> Number of records: 7+ million
> Database size: 13.3 GB
> Index Size:  10.9 GB
>
> My questions are simply:
>
> 1) Approximately how long would it take Lucene to index these documents?
> 2) What would the approximate retrieval time be (i.e. search response
> time)?
>
> Can someone provide me with some informed guidance in this regard?
>
> Thanks in advance,
> John
>
> ______________________________________________
> John Law
> Director, Platform Management
> ProQuest
> 789 Eisenhower Parkway
> Ann Arbor, MI 48106
> 734-997-4877
> [hidden email]
> www.proquest.com
> www.csa.com
>
> ProQuest... Start here.
>
>
>