lucene-java-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From ajay_garg <garg.jeena.isi.ka.naam....@gmail.com>
Subject Re: Query in Lucene 2.3.0
Date Fri, 01 Feb 2008 06:13:13 GMT

@Mike.

Thanks for the reply. But I had thought that write.lock is there to prevent
multiple additions/updates/deleteDocuments. 

Has there been a change recently in this regard ?

Thanks
Ajay Garg



Michael McCandless-2 wrote:
> 
> 
> That's right.
> 
> Each thread can enter IndexWriter.add/update/deleteDocument(s) in  
> parallel.  There are some parts inside IndexWriter that are  
> synchronized but they are kept to a minimum to keep good thread  
> concurrency.  As you add threads it's best to increase the RAM buffer  
> at the same time to get better performance.
> 
> Mike
> 
> ajay_garg wrote:
> 
>>
>> @Yonik
>>
>> So you mean to say, that if two threads have the same instance of an
>> IndexWriter passed to both of them, and both these threads run on two
>> different CPUs, then they can write to the index at the same time ?
>>
>>
>>
>> Yonik Seeley wrote:
>>>
>>> On Jan 30, 2008 10:59 PM, ajay_garg
>>> <garg.jeena.isi.ka.naam.hai@gmail.com> wrote:
>>>>
>>>> Thanks Mike for your directions.
>>>>
>>>> Yes, I am in fact using a single computer for my application, and  
>>>> your
>>>> saying that in this case, multiple threads with a single  
>>>> IndexWriter wll
>>>> give a better performance. Hmmm. I just wonder that since each
>>>> IndexWriter
>>>> has a single write.lock, this means that sitting on the CPU, we  
>>>> observe
>>>> that
>>>> at a particular instant, only a single thread is using the CPU,
>>>
>>> The write.lock is to protect against other IndexWriter instances,
>>> *not* against other threads.
>>> Using multiple threads on a single IndexWriter should utilize  
>>> multiple
>>> CPUs.
>>>
>>> -Yonik
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>>> For additional commands, e-mail: java-user-help@lucene.apache.org
>>>
>>>
>>>
>>
>> -- 
>> View this message in context: http://www.nabble.com/Query-in- 
>> Lucene-2.3.0-tp15175141p15198783.html
>> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>> For additional commands, e-mail: java-user-help@lucene.apache.org
>>
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
> 
> 
> 

-- 
View this message in context: http://www.nabble.com/Query-in-Lucene-2.3.0-tp15175141p15221338.html
Sent from the Lucene - Java Users mailing list archive at Nabble.com.


---------------------------------------------------------------------
To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-user-help@lucene.apache.org


Mime
View raw message