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Conditionally use sequential stored field reader in LuceneSyntheticSourceChangesSnapshot #121636

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merged 12 commits into from
Feb 10, 2025
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Conditionally use sequential stored field reader in LuceneSyntheticSourceChangesSnapshot #121636

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6eb67b2
Use sequential reader in LuceneSyntheticSourceChangesSnapshot
martijnvg Feb 4, 2025
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martijnvg Feb 4, 2025
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Merge remote-tracking branch 'es/main' into LuceneSyntheticSourceChan…
martijnvg Feb 4, 2025
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Merge remote-tracking branch 'es/main' into LuceneSyntheticSourceChan…
martijnvg Feb 6, 2025
1d0a210
pass down docids in order to determine whether to load sequential
martijnvg Feb 6, 2025
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martijnvg Feb 6, 2025
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Merge remote-tracking branch 'es/main' into LuceneSyntheticSourceChan…
martijnvg Feb 7, 2025
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Merge remote-tracking branch 'es/main' into LuceneSyntheticSourceChan…
martijnvg Feb 10, 2025
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martijnvg Feb 10, 2025
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5 changes: 4 additions & 1 deletion ...er/src/main/java/org/elasticsearch/index/engine/LuceneSyntheticSourceChangesSnapshot.java
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Expand Up @@ -15,6 +15,7 @@
import org.apache.lucene.util.ArrayUtil;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.IndexVersion;
import org.elasticsearch.index.codec.CodecService;
import org.elasticsearch.index.fieldvisitor.LeafStoredFieldLoader;
import org.elasticsearch.index.fieldvisitor.StoredFieldLoader;
import org.elasticsearch.index.mapper.MapperService;
Expand Down Expand Up @@ -83,7 +84,9 @@ public LuceneSyntheticSourceChangesSnapshot(
this.maxMemorySizeInBytes = maxMemorySizeInBytes > 0 ? maxMemorySizeInBytes : 1;
this.sourceLoader = mapperService.mappingLookup().newSourceLoader(null, SourceFieldMetrics.NOOP);
Set<String> storedFields = sourceLoader.requiredStoredFields();
this.storedFieldLoader = StoredFieldLoader.create(false, storedFields);
String codec = EngineConfig.INDEX_CODEC_SETTING.get(mapperService.getIndexSettings().getSettings());
boolean shouldForceSequentialReader = CodecService.BEST_COMPRESSION_CODEC.equals(codec);
this.storedFieldLoader = StoredFieldLoader.create(false, storedFields, shouldForceSequentialReader);
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Maybe we should use always force a sequential reader. I think no matter the stored field format, it has benefits given how LuceneSyntheticSourceChangesSnapshot access stored fields.

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I am not entirely sure. Does this not depend upon how jumpy the data is, which with index sorting could be very jumpy - and whether there is more than one stored field per doc (not sure that is always true?)?

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Right, this is why then changed to logic not look at index.codec setting anymore.

this.lastSeenSeqNo = fromSeqNo - 1;
}

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