Examples of org.apache.lucene.index.ConcurrentMergeScheduler

org.apache.lucene.index.ConcurrentMergeScheduler
A {@link MergeScheduler} that runs each merge using aseparate thread, up until a maximum number of threads ( {@link #setMaxThreadCount}) at which when a merge is needed, the thread(s) that are updating the index will pause until one or more merges completes. This is a simple way to use concurrency in the indexing process without having to create and manage application level threads.

  }


  private final ConcurrentHashMap<Thread,MergePolicy.OneMerge> merges = new ConcurrentHashMap<Thread,MergePolicy.OneMerge>();


  public MergeScheduler getMergeScheduler() {
    return new ConcurrentMergeScheduler() {
      @Override
      protected void doMerge(MergePolicy.OneMerge merge) throws IOException {
        try {
          merges.put(Thread.currentThread(), merge);
          super.doMerge(merge);

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  public void testIntermediateClose() throws IOException, InterruptedException {
    Directory dir = newDirectory();
    // Test can deadlock if we use SMS:
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random())).setMergeScheduler(new ConcurrentMergeScheduler()));
    writer.addDocument(new Document());
    writer.commit();
    final CountDownLatch awaitEnterWarm = new CountDownLatch(1);
    final CountDownLatch awaitClose = new CountDownLatch(1);
    final AtomicBoolean triedReopen = new AtomicBoolean(false);

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      } catch (Exception e) {
        throw new RuntimeException("unable to instantiate class '" + mergeScheduler + "' as merge scheduler", e);
      }
      
      if (mergeScheduler.equals("org.apache.lucene.index.ConcurrentMergeScheduler")) {
        ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler) iwConf.getMergeScheduler();
        int maxThreadCount = config.get("concurrent.merge.scheduler.max.thread.count", ConcurrentMergeScheduler.DEFAULT_MAX_THREAD_COUNT);
        int maxMergeCount = config.get("concurrent.merge.scheduler.max.merge.count", ConcurrentMergeScheduler.DEFAULT_MAX_MERGE_COUNT);
        cms.setMaxMergesAndThreads(maxMergeCount, maxThreadCount);
      }
    }


    final String defaultCodec = config.get("default.codec", null);
    if (defaultCodec != null) {

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      } catch (Exception e) {
        throw new RuntimeException("unable to instantiate class '" + mergeScheduler + "' as merge scheduler", e);
      }
      
      if (mergeScheduler.equals("org.apache.lucene.index.ConcurrentMergeScheduler")) {
        ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler) iwConf.getMergeScheduler();
        int maxThreadCount = config.get("concurrent.merge.scheduler.max.thread.count", ConcurrentMergeScheduler.DEFAULT_MAX_THREAD_COUNT);
        int maxMergeCount = config.get("concurrent.merge.scheduler.max.merge.count", ConcurrentMergeScheduler.DEFAULT_MAX_MERGE_COUNT);
        cms.setMaxMergesAndThreads(maxMergeCount, maxThreadCount);
      }
    }


    final String defaultCodec = config.get("default.codec", null);
    if (defaultCodec != null) {

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  public void testIntermediateClose() throws IOException, InterruptedException {
    Directory dir = newDirectory();
    // Test can deadlock if we use SMS:
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random())).setMergeScheduler(new ConcurrentMergeScheduler()));
    writer.addDocument(new Document());
    writer.commit();
    final CountDownLatch awaitEnterWarm = new CountDownLatch(1);
    final CountDownLatch awaitClose = new CountDownLatch(1);
    final AtomicBoolean triedReopen = new AtomicBoolean(false);

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  }


  public void testReferenceDecrementIllegally() throws Exception {
    Directory dir = newDirectory();
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random())).setMergeScheduler(new ConcurrentMergeScheduler()));
    SearcherManager sm = new SearcherManager(writer, false, new SearcherFactory());
    writer.addDocument(new Document());
    writer.commit();
    sm.maybeRefreshBlocking();

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  @Test
  public void testPropsDefaults() throws Exception {
    ExposeWriterHandler uh = new ExposeWriterHandler();
    IndexWriter writer = uh.getWriter();
    ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler)writer.getConfig().getMergeScheduler();
    assertEquals(4, cms.getMaxThreadCount());
    uh.close();
  }

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  }
  
  public void testProps() throws Exception {
    ExposeWriterHandler uh = new ExposeWriterHandler();
    IndexWriter writer = uh.getWriter();
    ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler)writer.getConfig().getMergeScheduler();
    assertEquals(2, cms.getMaxThreadCount());
    uh.close();
  }

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    assertEquals(32.0, mp.getMaxMergeMB());
  }
  
  public void testProps() throws Exception {
    IndexWriter writer = new ExposeWriterHandler().getWriter();
    ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler)writer.getMergeScheduler();
    assertEquals(2, cms.getMaxThreadCount());
  }

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    assertEquals(2, cms.getMaxThreadCount());
  }


  public void testPropsDefaults() throws Exception {
    IndexWriter writer = new ExposeWriterHandler().getWriter();
    ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler)writer.getMergeScheduler();
    assertEquals(10, cms.getMaxThreadCount());
  }

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