Hi,
Another newbie here...using Lucene 2.3.1 on Linux. Hopefully anyone
could advice me on /subj/.
Both IndexSearcher Javadoc and Lucene FAQ says the IndexSearcher
should be reused as it's thread safe. That's OK.
Now if I have index changed, I need to reopen the IndexReader that is
associated with it. How do I do this as IndexSearcher has no setter
method for IndexReader?
Let's speak in Java. Say, we've got a static singletone accessor method:
...
private static Searcher instance;
...
public static Searcher getLuceneSearcher () {
if( instance == null ) {
IndexReader reader = IndexReader.open( "/tmp/index_folder" );
instance = new IndexSearcher( reader ); // simple yet boring
} else { // here goes the fun part
IndexReader r_old = instance.getIndexReader();
IndexReader r_new = r_old.reopen();
if( r_old != r_new ) {
r_old.close(); // thanks for nice Javadoc, guys!
// what to do now? there's no instance.setIndexReader( r_new )!
}
}
return instance;
}
Of course, I could create a new IndexSearcher on the else branch and
return it. However, this approach resulted the infamous "too many open
files" exception. Lifting the `ulimit -n` to hundreds of thousands of
files didn't really help as the same exception was still being thrown
(actual resource usage fluctuating around 2000 of open files). Then
from `lsof` output I noticed that the same segment file was being open
more than once, apparently from different instances of
IndexSearchers/IndexReaders and went the path shown above. Maybe I'm
just plain wrong.
Really appreciate your advice.
Regards,
Mindaugas
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