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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: the question about the example of lucene in action
Date Tue, 15 Apr 2008 09:17:31 GMT

This question actually belongs on the java-user@lucene.apache.org  
(instead of general).  It will get more attention there.

Lucene now logs quite a bit more detail than just segment merges to  
that infoStream.  This particular snippet is the detailing which  
files are being incref'd & decref'd; this is used to decide what  
files can safely be deleted.  Lines that have "merge" or "merging"  
will tell you when merges are taking place.

Mike

oibook13 wrote:
>
> lucene in action has a instance about explaining indexwriter's
> MergeFactor,MaxMergeDocs parameter on 2.7.1. Because of lucene's  
> edition,
> imodified it just like this:
> public class IndexTuningDemo {
> 	
> 	public static void main(String[] args) throws Exception {
> 		int docsInIndex = Integer.parseInt(args[0]);
> 		
> 		Directory dir = FSDirectory.getDirectory(
> 				System.getProperty("java.io.tmpdir","tmp")+
> 				System.getProperty("file.separator")+"index-dir");
> 		Analyzer analyzer = new SimpleAnalyzer();
> 		IndexWriter writer = new IndexWriter(dir,analyzer,true);
> 		
> 		writer.setMergeFactor(Integer.parseInt(args[1]));
> 		writer.setMaxMergeDocs(Integer.parseInt(args[2]));
> 		writer.setInfoStream(System.out);
> 		
> 		System.out.println("Merge factor: "+writer.getMergeFactor());
> 		System.out.println("Max merge docs: "+writer.getMaxMergeDocs());
> 		
> 		long start = System.currentTimeMillis();
> 		for (int i = 0; i < docsInIndex ; i++){
> 			Document doc = new Document();
> 			doc.add(new
> Field("fieldname","Bibamus",Field.Store.YES,Field.Index.TOKENIZED));
> 			writer.addDocument(doc);
> 		}
> 		writer.close();
> 		long stop = System.currentTimeMillis();
> 		System.out.println("Time: "+(stop-start)+" ms");
> 	}
> }
>
> but the result which came from the program isn't like the books  
> says,but
> like this(i omit a part of it because it is so much many line):
> org.apache.lucene.index.IndexFileDeleter@18558d2 main:   DecRef  
> "_2r.cfs":
> pre-decr count is 2
> org.apache.lucene.index.IndexFileDeleter@18558d2 main:   DecRef  
> "_2s.cfs":
> pre-decr count is 2
> org.apache.lucene.index.IndexFileDeleter@18558d2 main:   DecRef
> "segments_5o": pre-decr count is 1
> org.apache.lucene.index.IndexFileDeleter@18558d2 main: delete  
> "segments_5o"
> org.apache.lucene.index.IndexFileDeleter@18558d2 main: now checkpoint
> "segments_5q" [isCommit = true]
> org.apache.lucene.index.IndexFileDeleter@18558d2 main:   IncRef  
> "_a.cfs":
> pre-incr count is 1
> org.apache.lucene.index.IndexFileDeleter@18558d2 main:   IncRef  
> "_l.cfs":
> pre-incr count is 1
> org.apache.lucene.index.IndexFileDeleter@18558d2 main:   IncRef  
> "_w.cfs":
> pre-incr count is 1
> …………
> org.apache.lucene.index.IndexFileDeleter@18558d2 main:   DecRef
> "segments_67": pre-decr count is 1
> org.apache.lucene.index.IndexFileDeleter@18558d2 main: delete  
> "segments_67"
> Time: 4156 ms
>
> i don't know what it is meaning! i would appreciate that if some  
> one could
> explain it. thanks.
> -- 
> View this message in context: http://www.nabble.com/the-question- 
> about-the-example-of-lucene-in-action-tp16671486p16671486.html
> Sent from the Lucene - General mailing list archive at Nabble.com.
>


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