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Fix bug in tsdb doc value codec #134979

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Merged
martijnvg merged 4 commits into from
Sep 18, 2025
Merged

Fix bug in tsdb doc value codec #134979

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c7419e0
Fix bug in tsdb doc value codec
martijnvg Sep 18, 2025
77f7052
Merge remote-tracking branch 'es/main' into tsdb_codec/ordinal_range_…
martijnvg Sep 18, 2025
72a6592
read multi-valued range encoded values and return as singleton sorted…
martijnvg Sep 18, 2025
167bb1d
remove usage of offsetAccumulator
martijnvg Sep 18, 2025
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5 changes: 3 additions & 2 deletions ...er/src/main/java/org/elasticsearch/index/codec/tsdb/es819/ES819TSDBDocValuesConsumer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -129,9 +129,10 @@ public SortedNumericDocValues getSortedNumeric(FieldInfo field) throws IOExcepti
writeField(field, producer, -1, null);
}

private boolean shouldEncodeOrdinalRange(FieldInfo field, long maxOrd, int numDocsWithValue) {
private boolean shouldEncodeOrdinalRange(FieldInfo field, long maxOrd, int numDocsWithValue, long numValues) {
return maxDoc > 1
&& field.number == primarySortFieldNumber
&& numDocsWithValue == numValues // Only single valued fields can be supported with range encoded ordinals format
&& (numDocsWithValue / maxOrd) >= minDocsPerOrdinalForOrdinalRangeEncoding;
}

Expand Down Expand Up @@ -167,7 +168,7 @@ private long[] writeField(FieldInfo field, TsdbDocValuesProducer valuesProducer,
if (maxOrd == 1) {
// Special case for maxOrd of 1, signal -1 that no blocks will be written
meta.writeInt(-1);
} else if (shouldEncodeOrdinalRange(field, maxOrd, numDocsWithValue)) {
} else if (shouldEncodeOrdinalRange(field, maxOrd, numDocsWithValue, numValues)) {
// When a field is sorted, use ordinal range encode for long runs of the same ordinal.
meta.writeInt(-2);
meta.writeVInt(Math.toIntExact(maxOrd));
Expand Down
1 change: 1 addition & 0 deletions ...er/src/main/java/org/elasticsearch/index/codec/tsdb/es819/ES819TSDBDocValuesProducer.java
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Expand Up @@ -1638,6 +1638,7 @@ private SortedNumericDocValues getSortedNumeric(SortedNumericEntry entry, long m
final RandomAccessInput addressesInput = data.randomAccessSlice(entry.addressesOffset, entry.addressesLength);
final LongValues addresses = DirectMonotonicReader.getInstance(entry.addressesMeta, addressesInput, merging);

assert entry.sortedOrdinals == null : "encoded ordinal range supports only one value per document";
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@martijnvg martijnvg Sep 18, 2025

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Invoking getValues(...) will result into a NPE if entry.sortedOrdinals != null.
Maybe we can return a singleton SortedNumericDocValues instance here, so that at least the the first value of every document is available?

final NumericValues values = getValues(entry, maxOrd);

if (entry.docsWithFieldOffset == -1) {
Expand Down
80 changes: 79 additions & 1 deletion ...src/test/java/org/elasticsearch/index/codec/tsdb/es819/ES819TSDBDocValuesFormatTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.SortedNumericSortField;
import org.apache.lucene.search.SortedSetSortField;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.cluster.metadata.DataStream;
Expand Down Expand Up @@ -1302,6 +1303,79 @@ public int get(int docId) {
}
}

public void testEncodeRangeWithSortedSetPrimarySortField() throws Exception {
String timestampField = "@timestamp";
String hostnameField = "host.name";
long baseTimestamp = 1704067200000L;

var config = getTimeSeriesIndexWriterConfig(hostnameField, true, timestampField);
try (var dir = newDirectory(); var iw = new IndexWriter(dir, config)) {

int numDocs = 512 + random().nextInt(512);
int numHosts = numDocs / 20;

for (int i = 0; i < numDocs; i++) {
var d = new Document();
int batchIndex = i / numHosts;
{
String hostName = String.format(Locale.ROOT, "host-%03d", batchIndex);
d.add(new SortedSetDocValuesField(hostnameField, new BytesRef(hostName)));
}
{
String hostName = String.format(Locale.ROOT, "host-%03d", batchIndex + 1);
d.add(new SortedSetDocValuesField(hostnameField, new BytesRef(hostName)));
}
// Index sorting doesn't work with NumericDocValuesField:
long timestamp = baseTimestamp + (1000L * i);
d.add(new SortedNumericDocValuesField(timestampField, timestamp));
iw.addDocument(d);
if (i % 100 == 0) {
iw.commit();
}
}
iw.commit();
iw.forceMerge(1);

try (var reader = DirectoryReader.open(iw)) {
assertEquals(1, reader.leaves().size());
assertEquals(numDocs, reader.maxDoc());
var leaf = reader.leaves().get(0).reader();
var hostNameDV = leaf.getSortedSetDocValues(hostnameField);
assertNotNull(hostNameDV);
var timestampDV = DocValues.unwrapSingleton(leaf.getSortedNumericDocValues(timestampField));
assertNotNull(timestampDV);
for (int i = 0; i < numDocs; i++) {
assertEquals(i, hostNameDV.nextDoc());

int batchIndex = i / numHosts;
assertEquals(2, hostNameDV.docValueCount());

long firstOrd = hostNameDV.nextOrd();
assertEquals(batchIndex, firstOrd);
String expectedFirstHostName = String.format(Locale.ROOT, "host-%03d", batchIndex);
String actualFirstHostName = hostNameDV.lookupOrd(firstOrd).utf8ToString();
assertEquals(expectedFirstHostName, actualFirstHostName);

batchIndex++;
long secondOrd = hostNameDV.nextOrd();
assertEquals(batchIndex, secondOrd);
String expectedSecondHostName = String.format(Locale.ROOT, "host-%03d", batchIndex);
String actualSecondHostName = hostNameDV.lookupOrd(secondOrd).utf8ToString();
assertEquals(expectedSecondHostName, actualSecondHostName);

assertEquals(i, timestampDV.nextDoc());
long timestamp = timestampDV.longValue();
long lowerBound = baseTimestamp;
long upperBound = baseTimestamp + (1000L * numDocs);
assertTrue(
"unexpected timestamp [" + timestamp + "], expected between [" + lowerBound + "] and [" + upperBound + "]",
timestamp >= lowerBound && timestamp < upperBound
);
}
}
}
}

private static BaseDenseNumericValues getBaseDenseNumericValues(LeafReader leafReader, String field) throws IOException {
return (BaseDenseNumericValues) DocValues.unwrapSingleton(leafReader.getSortedNumericDocValues(field));
}
Expand All @@ -1315,11 +1389,15 @@ private static BaseSortedDocValues getBaseSortedDocValues(LeafReader leafReader,
}

private IndexWriterConfig getTimeSeriesIndexWriterConfig(String hostnameField, String timestampField) {
return getTimeSeriesIndexWriterConfig(hostnameField, false, timestampField);
}

private IndexWriterConfig getTimeSeriesIndexWriterConfig(String hostnameField, boolean multiValued, String timestampField) {
var config = new IndexWriterConfig();
if (hostnameField != null) {
config.setIndexSort(
new Sort(
new SortField(hostnameField, SortField.Type.STRING, false),
multiValued ? new SortedSetSortField(hostnameField, false) : new SortField(hostnameField, SortField.Type.STRING, false),
new SortedNumericSortField(timestampField, SortField.Type.LONG, true)
)
);
Expand Down