Kranthi created LUCENE-8558:
-------------------------------
Summary: Adding NumericDocValuesFields is slowing down the
indexing process significantly
Key: LUCENE-8558
URL: https://issues.apache.org/jira/browse/LUCENE-8558
Project: Lucene - Core
Issue Type: Improvement
Components: core/index
Affects Versions: 7.5, 7.4
Reporter: Kranthi
Fix For: 7.5, 7.4
The indexing time for my ~2M documents has gone up significantly when I started
adding fields of type NumericDocValuesField.
Upon debugging found the bottleneck to be in the
PerFieldMergeState#FilterFieldInfos constructor. The contains check in the
below code snippet was the culprit.
{code:java}
this.filteredNames = new HashSet<>(filterFields);
this.filtered = new ArrayList<>(filterFields.size());
for (FieldInfo fi : src) {
if (filterFields.contains(fi.name)) {
{code}
A simple change to the following seems to have fixed my issue
{code:java}
this.filteredNames = new HashSet<>(filterFields);
this.filtered = new ArrayList<>(filterFields.size());
for (FieldInfo fi : src) {
if (this.filteredNames.contains(fi.name)) {
{code}
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