package org.apache.lucene.index;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LineFileDocs;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.TestUtil;
public class TestForceMergeForever extends LuceneTestCase {
// Just counts how many merges are done
private static class MyIndexWriter extends IndexWriter {
AtomicInteger mergeCount = new AtomicInteger();
private boolean first;
public MyIndexWriter(Directory dir, IndexWriterConfig conf) throws Exception {
super(dir, conf);
}
@Override
public void merge(MergePolicy.OneMerge merge) throws IOException {
if (merge.maxNumSegments != -1 && (first || merge.segments.size() == 1)) {
first = false;
if (VERBOSE) {
System.out.println("TEST: maxNumSegments merge");
}
mergeCount.incrementAndGet();
}
super.merge(merge);
}
}
public void test() throws Exception {
final Directory d = newDirectory();
MockAnalyzer analyzer = new MockAnalyzer(random());
analyzer.setMaxTokenLength(TestUtil.nextInt(random(), 1, IndexWriter.MAX_TERM_LENGTH));
final MyIndexWriter w = new MyIndexWriter(d, newIndexWriterConfig(TEST_VERSION_CURRENT, analyzer));
// Try to make an index that requires merging:
w.getConfig().setMaxBufferedDocs(TestUtil.nextInt(random(), 2, 11));
final int numStartDocs = atLeast(20);
final LineFileDocs docs = new LineFileDocs(random(), defaultCodecSupportsDocValues());
for(int docIDX=0;docIDX<numStartDocs;docIDX++) {
w.addDocument(docs.nextDoc());
}
MergePolicy mp = w.getConfig().getMergePolicy();
final int mergeAtOnce = 1+w.segmentInfos.size();
if (mp instanceof TieredMergePolicy) {
((TieredMergePolicy) mp).setMaxMergeAtOnce(mergeAtOnce);
} else if (mp instanceof LogMergePolicy) {
((LogMergePolicy) mp).setMergeFactor(mergeAtOnce);
} else {
// skip test
w.close();
d.close();
return;
}
final AtomicBoolean doStop = new AtomicBoolean();
w.getConfig().setMaxBufferedDocs(2);
Thread t = new Thread() {
@Override
public void run() {
try {
while (!doStop.get()) {
w.updateDocument(new Term("docid", "" + random().nextInt(numStartDocs)),
docs.nextDoc());
// Force deletes to apply
w.getReader().close();
}
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
};
t.start();
w.forceMerge(1);
doStop.set(true);
t.join();
assertTrue("merge count is " + w.mergeCount.get(), w.mergeCount.get() <= 1);
w.close();
d.close();
docs.close();
}
}