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bugfix: prevent background merges on the realtime lucene index #13050

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May 3, 2024
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bugfix: prevent background merges on the realtime lucene index #13050

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10 changes: 10 additions & 0 deletions ...java/org/apache/pinot/segment/local/segment/creator/impl/text/LuceneTextIndexCreator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.NoMergeScheduler;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
Expand Down Expand Up @@ -131,6 +132,15 @@ public LuceneTextIndexCreator(String column, File segmentIndexDir, boolean commi
indexWriterConfig.setCommitOnClose(commit);
indexWriterConfig.setUseCompoundFile(config.isLuceneUseCompoundFile());

// For the realtime segment, prevent background merging. The realtime segment will call .commit()
// on the IndexWriter when segment conversion occurs. By default, Lucene will sometimes choose to
// merge segments in the background, which is problematic because the lucene index directory's
// contents is copied to create the immutable segment. If a background merge occurs during this
// copy, a FileNotFoundException will be triggered and segment build will fail.
if (!_commitOnClose) {
indexWriterConfig.setMergeScheduler(NoMergeScheduler.INSTANCE);
}

if (_reuseMutableIndex) {
LOGGER.info("Reusing the realtime lucene index for segment {} and column {}", segmentIndexDir, column);
indexWriterConfig.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);
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