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From Willis Morse <willismo...@mac.com>
Subject Re: Index/data corruption
Date Wed, 25 Apr 2007 20:27:58 GMT
Great, thanks for the info Marcel.

- Will


On Apr 25, 2007, at 4:19 PM, Marcel Reutegger wrote:

> Willis Morse wrote:
>> Is the indexing done asynchronously?
>
> no, but it is also not completely synchronously ;)
>
> the query handler writes a forward log with the index changes. then  
> the changes are indexed but not immediately written to disk. this  
> is done synchronously. you can configure an idle time for the in  
> memory part of the index to be written to disk.
>
> some part of the indexing may be asynchronous, but not by default:  
> text extraction from nt:resource nodes. if you configure the  
> extractorPoolSize parameter in the SearchIndex element.
>
> See: http://issues.apache.org/jira/browse/JCR-390
>
>> In my Swing app, I might do something like this:
>>     session.save();
>>     session.logout();
>>     System.exit();
>> Is this safe?
>
> this depends on how you instantiated the repository. if you are  
> using a TransientRepository it should be safe because once the  
> session (assuming it is the only session your application uses)  
> logs out the underlying repository is also shutdown.
>
> if you started jackrabbit manually you should also shut it down  
> before you exit the jvm. I say should because jackrabbit is able to  
> handle this case and also the derby database. even though this is  
> not the preferred way, because it forces  derby but also the query  
> handler to potentially process a forward log when jackrabbit is  
> started the next time. so, whenever possible you should shut down  
> jackrabbit properly before you exit the jvm (under the assumption  
> that you are using jackrabbit in-process and not via rmi).
>
>> If not, how do we programmatically determine when it is safe to  
>> exit the app?
>
> Call RepositoryImpl.shutdown() when you are finished using  
> jackrabbit and then exit.
>
> regards
>  marcel


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