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https://issues.apache.org/jira/browse/LUCENE-10509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525652#comment-17525652
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Rajesh T commented on LUCENE-10509:
-----------------------------------
[~jpountz] I have made the change in our custom plugin as you suggested. There
was no performance improvement even after the change. Please have a look at the
below code which is running slower with lucene 8.9.0. For 1M documents, below
code is executed 290 times/minute with 8.8.2 version, and 140 times/minutes
with 8.9.0 version.
{code:java}
SortedSetDocValues values = ((ValuesSource.Bytes.WithOrdinals.FieldData)
valuesSource).ordinalsValues(leafReaderContext);
BitSet ordSet = new BitSet();
int doc = values.nextDoc();
while (doc != DocIdSetIterator.NO_MORE_DOCS) {
while (true) {
long ord = values.nextOrd();
if (ord == SortedSetDocValues.NO_MORE_ORDS) {
break;
}
ordSet.set((int) ord);
}
doc = values.nextDoc();
}
ordSet.stream().forEach(x -> {
try {
byte[] bytes = values.lookupOrd(x).bytes;
} catch (IOException e) {
e.printStackTrace();
}
});
{code}
> Performance degraded after upgrade from 8.8.2 to 8.9.0
> ------------------------------------------------------
>
> Key: LUCENE-10509
> URL: https://issues.apache.org/jira/browse/LUCENE-10509
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 8.8.2
> Reporter: Rajesh T
> Priority: Minor
>
> We are planning to upgrade from elasticsearch 7.7.1 to opensearch 1.1.0 (with
> lucene version 8.9.0). We have noticed that the performance of opensearch
> 1.1.0 is worse than elasticsearch 7.7.1 due to lucene 8.9.0 version. Whereas
> performance of opensearch 1.0.1 (with lucene version 8.8.2) is almost same as
> elasticsearch 7.7.1 version.
> We have tested following scenarios and observed the slowness is caused by
> lucene 8.9.0 version. The performance is degraded by 50% for cardinality
> aggregations.
> Elasticsearch 7.7.1 version (with lucene-core 8.5.1) : Fast
> OpenSearch 1.0.1 version (with lucene-core 8.8.2) : Fast
> OpenSearch 1.1.0 version (with lucene-core 8.9.0) : Slow
> OpenSearch 1.1.0 version (with lucene-core 8.8.2) : Fast
> This is the snippet of openseach code which is running slow with lucene 8.9.0
> {code:java}
> QueryBuilder qb =
> QueryBuilders.boolQuery().mustNot(QueryBuilders.termQuery("__id.keyword",
> randomValue));
> CardinalityAggregationBuilder agg = AggregationBuilders
> .cardinality("somename")
> .field("__id.keyword");
> return client.prepareSearch(index).setQuery(qb).addAggregation(agg);
> {code}
> Please let us know if this is something that can be fixed.
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