--- /dev/null
+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 CorruptIndexException, 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();
+ final MyIndexWriter w = new MyIndexWriter(d, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
+
+ // 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);
+ 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();
+ }
+}