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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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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
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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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martijnvg Feb 6, 2025
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Merge remote-tracking branch 'es/main' into LuceneSyntheticSourceChan…
martijnvg Feb 7, 2025
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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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@martijnvg
martijnvg committed Feb 6, 2025
commit c6cc1e79ccba7e587a2efb6873a38cdd110f4690
14 changes: 9 additions & 5 deletions ...er/src/main/java/org/elasticsearch/index/engine/LuceneSyntheticSourceChangesSnapshot.java
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Expand Up @@ -194,14 +194,18 @@ private Translog.Operation[] loadDocuments(List<SearchRecord> documentRecords) t
maxDoc = leafReaderContext.reader().maxDoc();
} while (docRecord.docID() >= docBase + maxDoc);

// TODO: instead of building an array, let's just check whether doc ids are (semi) dense
IntArrayList nextDocIds = new IntArrayList();
for (int j = i; j < documentRecords.size(); j++) {
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As far as I understand we're not increasing the complexity of the method by iterating on documentRecords again here (as we already iterates on documentRecords in the outer loop), because we only compute nextDocIds for 1 leaf reader. Can you confirm?

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Yes, we only compute the docids for the current lead reader. If docid is higher then or equal to docbase + maxDoc then it means current document record belongs to the next leaf reader.

int docID = documentRecords.get(j).docID();
if (docBase + maxDoc >= docID) {
break;
var record = documentRecords.get(j);
if (record.isTombstone()) {
continue;
}
int docID = record.docID();
if (docID >= docBase && docID < docBase + maxDoc) {
int segmentDocID = docID - docBase;
nextDocIds.add(segmentDocID);
}
int segmentDocID = docID - docBase;
nextDocIds.add(segmentDocID);
}

int[] nextDocIdArray = nextDocIds.toArray();
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