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From David K <>
Subject Re: Multiple instances of Lucene IndexWriter
Date Fri, 12 Oct 2007 12:36:42 GMT

Thank you for the quick response but at the moment we are interested in our
own (small) usage of Lucene. It may be that in the future it turns out that
Solr is the solution we need.

At the moment I was hoping for a more descriptive workaround for the issue
of using multiple instances of IndexWriter on the same index.

Erik Hatcher wrote:
> David,
> Have a look at Solr, - it addresses  
> this issue and many others that you would likely encounter with using  
> pure Lucene.
> 	Erik
> On Oct 12, 2007, at 6:26 AM, David K wrote:
>> We are currently evaluating Lucene for document indexing and a  
>> question came
>> up regarding multiple instances of IndexWriter possibly accessing  
>> the same
>> index (directory).
>> This would be a consequence of multiple instances of our application
>> possibly accessing the same index. Where multiple instances are  
>> used for
>> load balancing and fail over of the application.
>> The index could be either on a local drive when virtualization is  
>> used to
>> achieve multiple instances on a single box. The index could also be  
>> on a
>> shared drive (windows file sharing) and multiple server instances  
>> trying to
>> update it.
>> I have been looking around in the forums and it is always advised  
>> against
>> multiple instances of IndexWriter  writing to the same index but I was
>> wondering whether the group has any suggestions for workarounds.  
>> Surely
>> there must be other load balanced applications using Lucene?
>> Some the workarounds I can think of OTTOMH:
>> 1. each instance writing to a local index and merge these local  
>> indexes
>> periodically to a shared index where searching is performed
>> 2. implement our own queuing algorithms by testing for write locks  
>> and wait
>> until locks are cleared
>> thank you,
>> David
>> -- 
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