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https://issues.apache.org/jira/browse/LUCENE-1012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535331
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Michael McCandless commented on LUCENE-1012:
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OK I will commit a fix to the javadocs.
> Problems with maxMergeDocs parameter
> ------------------------------------
>
> Key: LUCENE-1012
> URL: https://issues.apache.org/jira/browse/LUCENE-1012
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Reporter: Michael Busch
> Priority: Minor
> Fix For: 2.3
>
>
> I found two possible problems regarding IndexWriter's maxMergeDocs value. I'm
> using the following code to test maxMergeDocs:
> {code:java}
> public void testMaxMergeDocs() throws IOException {
> final int maxMergeDocs = 50;
> final int numSegments = 40;
>
> MockRAMDirectory dir = new MockRAMDirectory();
> IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(),
> true);
> writer.setMergePolicy(new LogDocMergePolicy());
> writer.setMaxMergeDocs(maxMergeDocs);
> Document doc = new Document();
> doc.add(new Field("field", "aaa", Field.Store.YES, Field.Index.TOKENIZED,
> Field.TermVector.WITH_POSITIONS_OFFSETS));
> for (int i = 0; i < numSegments * maxMergeDocs; i++) {
> writer.addDocument(doc);
> //writer.flush(); // uncomment to avoid the DocumentsWriter bug
> }
> writer.close();
>
> new SegmentInfos.FindSegmentsFile(dir) {
> protected Object doBody(String segmentFileName) throws
> CorruptIndexException, IOException {
> SegmentInfos infos = new SegmentInfos();
> infos.read(directory, segmentFileName);
> for (int i = 0; i < infos.size(); i++) {
> assertTrue(infos.info(i).docCount <= maxMergeDocs);
> }
> return null;
> }
> }.run();
> }
> {code}
>
> - It seems that DocumentsWriter does not obey the maxMergeDocs parameter. If
> I don't flush manually, then the index only contains one segment at the end
> and the test fails.
> - If I flush manually after each addDocument() call, then the index contains
> more segments. But still, there are segments that contain more docs than
> maxMergeDocs, e. g. 55 vs. 50. The javadoc in IndexWriter says:
> {code:java}
> /**
> * Returns the largest number of documents allowed in a
> * single segment.
> *
> * @see #setMaxMergeDocs
> */
> public int getMaxMergeDocs() {
> return getLogDocMergePolicy().getMaxMergeDocs();
> }
> {code}
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