private IndexWriter createWriter() throws IOException {
IndexWriter indexWriter = null;
try {
// release locks when started
if (IndexWriter.isLocked(store.directory())) {
logger.warn("shard is locked, releasing lock");
IndexWriter.unlock(store.directory());
}
boolean create = !IndexReader.indexExists(store.directory());
indexWriter =
new IndexWriter(
store.directory(),
analysisService.defaultIndexAnalyzer(),
create,
deletionPolicy,
IndexWriter.MaxFieldLength.UNLIMITED);
indexWriter.setMergeScheduler(mergeScheduler.newMergeScheduler());
indexWriter.setMergePolicy(mergePolicyProvider.newMergePolicy(indexWriter));
indexWriter.setSimilarity(similarityService.defaultIndexSimilarity());
indexWriter.setRAMBufferSizeMB(indexingBufferSize.mbFrac());
indexWriter.setTermIndexInterval(termIndexInterval);
} catch (IOException e) {
safeClose(indexWriter);
throw e;
}
return indexWriter;
}
private AcquirableResource<ReaderSearcherHolder> buildNrtResource(IndexWriter indexWriter)
throws IOException {
IndexReader indexReader = indexWriter.getReader();
IndexSearcher indexSearcher = new IndexSearcher(indexReader);
indexSearcher.setSimilarity(similarityService.defaultSearchSimilarity());
return newAcquirableResource(new ReaderSearcherHolder(indexSearcher));
}
@Override
public void refresh(Refresh refresh) throws EngineException {
// we obtain a read lock here, since we don't want a flush to happen while we are refreshing
// since it flushes the index as well (though, in terms of concurrency, we are allowed to do it)
rwl.readLock().lock();
if (indexWriter == null) {
throw new EngineClosedException(shardId);
}
try {
// this engine always acts as if waitForOperations=true
if (refreshMutex.compareAndSet(false, true)) {
IndexWriter currentWriter = indexWriter;
if (currentWriter == null) {
throw new EngineClosedException(shardId);
}
try {
if (dirty) {
dirty = false;
AcquirableResource<ReaderSearcherHolder> current = nrtResource;
IndexReader newReader = current.resource().reader().reopen(true);
if (newReader != current.resource().reader()) {
IndexSearcher indexSearcher = new IndexSearcher(newReader);
indexSearcher.setSimilarity(similarityService.defaultSearchSimilarity());
nrtResource = newAcquirableResource(new ReaderSearcherHolder(indexSearcher));
current.markForClose();
}
}
} catch (AlreadyClosedException e) {
// an index writer got replaced on us, ignore
} catch (Exception e) {
if (indexWriter == null) {
throw new EngineClosedException(shardId);
} else if (currentWriter != indexWriter) {
// an index writer got replaced on us, ignore
} else {
throw new RefreshFailedEngineException(shardId, e);
}
} finally {
refreshMutex.set(false);
}
}
} finally {
rwl.readLock().unlock();
}
}