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):
[EMAIL PROTECTED] main: DecRef "_2r.cfs":
pre-decr count is 2
[EMAIL PROTECTED] main: DecRef "_2s.cfs":
pre-decr count is 2
[EMAIL PROTECTED] main: DecRef
"segments_5o": pre-decr count is 1
[EMAIL PROTECTED] main: delete "segments_5o"
[EMAIL PROTECTED] main: now checkpoint
"segments_5q" [isCommit = true]
[EMAIL PROTECTED] main: IncRef "_a.cfs":
pre-incr count is 1
[EMAIL PROTECTED] main: IncRef "_l.cfs":
pre-incr count is 1
[EMAIL PROTECTED] main: IncRef "_w.cfs":
pre-incr count is 1
…………
[EMAIL PROTECTED] main: DecRef
"segments_67": pre-decr count is 1
[EMAIL PROTECTED] 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.
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