250 lines
7.7 KiB
Java
250 lines
7.7 KiB
Java
package it.cavallium.dbengine.database.disk;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import it.cavallium.dbengine.database.LLSnapshot;
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import it.cavallium.dbengine.lucene.LuceneCloseable;
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import it.cavallium.dbengine.utils.SimpleResource;
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import java.io.IOException;
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import it.cavallium.dbengine.utils.DBException;
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import java.time.Duration;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.ScheduledFuture;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicLong;
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import java.util.concurrent.locks.LockSupport;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.apache.lucene.index.IndexWriter;
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import org.apache.lucene.search.IndexSearcher;
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import org.apache.lucene.search.SearcherFactory;
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import org.apache.lucene.search.SearcherManager;
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import org.apache.lucene.search.similarities.Similarity;
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import org.apache.lucene.store.AlreadyClosedException;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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// todo: deduplicate code between Cached and Simple searcher managers
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public class CachedIndexSearcherManager extends SimpleResource implements IndexSearcherManager, LuceneCloseable {
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private static final Logger LOG = LogManager.getLogger(SimpleIndexSearcherManager.class);
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private static final ExecutorService SEARCH_EXECUTOR = Executors.newFixedThreadPool(
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Runtime.getRuntime().availableProcessors(),
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new LuceneThreadFactory("lucene-search")
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.setDaemon(true).withGroup(new ThreadGroup("lucene-search"))
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);
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private static final SearcherFactory SEARCHER_FACTORY = new ExecutorSearcherFactory(SEARCH_EXECUTOR);
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@Nullable
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private final SnapshotsManager snapshotsManager;
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private final Similarity similarity;
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private final SearcherManager searcherManager;
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private final AtomicLong activeSearchers = new AtomicLong(0);
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private final AtomicLong activeRefreshes = new AtomicLong(0);
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private final LoadingCache<LLSnapshot, LLIndexSearcher> cachedSnapshotSearchers;
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private final ScheduledFuture<?> refreshSubscription;
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public CachedIndexSearcherManager(IndexWriter indexWriter,
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@Nullable SnapshotsManager snapshotsManager,
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ScheduledExecutorService luceneHeavyTasksScheduler,
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Similarity similarity,
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boolean applyAllDeletes,
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boolean writeAllDeletes,
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Duration queryRefreshDebounceTime) {
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this.snapshotsManager = snapshotsManager;
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this.similarity = similarity;
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try {
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this.searcherManager = new SearcherManager(indexWriter, applyAllDeletes, writeAllDeletes, SEARCHER_FACTORY);
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} catch (IOException e) {
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throw new DBException(e);
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}
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refreshSubscription = luceneHeavyTasksScheduler.scheduleAtFixedRate(() -> {
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try {
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maybeRefresh();
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} catch (Exception ex) {
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LOG.error("Failed to refresh the searcher manager", ex);
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}
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},
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queryRefreshDebounceTime.toMillis(),
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queryRefreshDebounceTime.toMillis(),
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TimeUnit.MILLISECONDS
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);
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this.cachedSnapshotSearchers = CacheBuilder.newBuilder()
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.expireAfterWrite(queryRefreshDebounceTime)
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// Max 3 cached non-main index writers
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.maximumSize(3)
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.build(new CacheLoader<>() {
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@Override
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public LLIndexSearcher load(@NotNull LLSnapshot snapshot) {
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return CachedIndexSearcherManager.this.generateCachedSearcher(snapshot);
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}
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});
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}
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private LLIndexSearcher generateCachedSearcher(@Nullable LLSnapshot snapshot) {
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if (isClosed()) {
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return null;
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}
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activeSearchers.incrementAndGet();
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try {
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IndexSearcher indexSearcher;
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boolean fromSnapshot;
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if (snapshotsManager == null || snapshot == null) {
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try {
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indexSearcher = searcherManager.acquire();
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} catch (IOException ex) {
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throw new DBException(ex);
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}
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fromSnapshot = false;
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} else {
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indexSearcher = snapshotsManager.resolveSnapshot(snapshot).getIndexSearcher(SEARCH_EXECUTOR);
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fromSnapshot = true;
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}
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indexSearcher.setSimilarity(similarity);
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assert indexSearcher.getIndexReader().getRefCount() > 0;
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LLIndexSearcher llIndexSearcher;
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if (fromSnapshot) {
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llIndexSearcher = new SnapshotIndexSearcher(indexSearcher);
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} else {
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llIndexSearcher = new MainIndexSearcher(indexSearcher, searcherManager);
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}
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return llIndexSearcher;
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} catch (Throwable ex) {
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activeSearchers.decrementAndGet();
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throw ex;
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}
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}
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private void dropCachedIndexSearcher() {
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// This shouldn't happen more than once per searcher.
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activeSearchers.decrementAndGet();
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}
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@Override
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public void maybeRefreshBlocking() {
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try {
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activeRefreshes.incrementAndGet();
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searcherManager.maybeRefreshBlocking();
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} catch (AlreadyClosedException ignored) {
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} catch (IOException e) {
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throw new DBException(e);
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} finally {
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activeRefreshes.decrementAndGet();
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}
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}
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@Override
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public void maybeRefresh() {
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try {
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activeRefreshes.incrementAndGet();
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searcherManager.maybeRefresh();
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} catch (AlreadyClosedException ignored) {
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} catch (IOException e) {
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throw new DBException(e);
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} finally {
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activeRefreshes.decrementAndGet();
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}
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}
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@Override
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public LLIndexSearcher retrieveSearcher(@Nullable LLSnapshot snapshot) {
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if (snapshot == null) {
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return this.generateCachedSearcher(null);
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} else {
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return this.cachedSnapshotSearchers.getUnchecked(snapshot);
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}
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}
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@Override
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protected void onClose() {
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LOG.debug("Closing IndexSearcherManager...");
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long initTime = System.nanoTime();
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refreshSubscription.cancel(false);
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while (!refreshSubscription.isDone() && (System.nanoTime() - initTime) <= 240000000000L) {
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LockSupport.parkNanos(50000000);
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}
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refreshSubscription.cancel(true);
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LOG.debug("Closed IndexSearcherManager");
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LOG.debug("Closing refreshes...");
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initTime = System.nanoTime();
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while (activeRefreshes.get() > 0 && (System.nanoTime() - initTime) <= 15000000000L) {
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LockSupport.parkNanos(50000000);
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}
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LOG.debug("Closed refreshes...");
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LOG.debug("Closing active searchers...");
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initTime = System.nanoTime();
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while (activeSearchers.get() > 0 && (System.nanoTime() - initTime) <= 15000000000L) {
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LockSupport.parkNanos(50000000);
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}
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LOG.debug("Closed active searchers");
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LOG.debug("Stopping searcher executor...");
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cachedSnapshotSearchers.invalidateAll();
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cachedSnapshotSearchers.cleanUp();
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SEARCH_EXECUTOR.shutdown();
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try {
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if (!SEARCH_EXECUTOR.awaitTermination(15, TimeUnit.SECONDS)) {
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SEARCH_EXECUTOR.shutdownNow();
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}
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} catch (InterruptedException e) {
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LOG.error("Failed to stop executor", e);
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}
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LOG.debug("Stopped searcher executor");
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}
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public long getActiveSearchers() {
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return activeSearchers.get();
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}
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public long getActiveRefreshes() {
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return activeRefreshes.get();
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}
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private class MainIndexSearcher extends LLIndexSearcherImpl implements LuceneCloseable {
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public MainIndexSearcher(IndexSearcher indexSearcher, SearcherManager searcherManager) {
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super(indexSearcher, () -> releaseOnCleanup(searcherManager, indexSearcher));
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}
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private static void releaseOnCleanup(SearcherManager searcherManager, IndexSearcher indexSearcher) {
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try {
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LOG.warn("An index searcher was not closed!");
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searcherManager.release(indexSearcher);
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} catch (IOException ex) {
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LOG.error("Failed to release the index searcher during cleanup: {}", indexSearcher, ex);
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}
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}
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@Override
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public void onClose() {
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dropCachedIndexSearcher();
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try {
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searcherManager.release(indexSearcher);
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} catch (IOException ex) {
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throw new DBException(ex);
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}
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}
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}
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private class SnapshotIndexSearcher extends LLIndexSearcherImpl {
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public SnapshotIndexSearcher(IndexSearcher indexSearcher) {
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super(indexSearcher);
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}
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@Override
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public void onClose() {
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dropCachedIndexSearcher();
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}
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}
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}
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