Pierre-Luc Perron created LUCENE-9314:
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Summary: Lucene monitor module uses ByteBuffersDirectory rather
than MemoryIndex when matching a single document
Key: LUCENE-9314
URL: https://issues.apache.org/jira/browse/LUCENE-9314
Project: Lucene - Core
Issue Type: Improvement
Components: modules/other
Affects Versions: 8.5, 8.4, 8.3, 8.2
Reporter: Pierre-Luc Perron
Lucene monitor function, [match single
document|https://github.com/apache/lucene-solr/blob/e376582e25d02f85b415eb1c0456f3fdc800fc84/lucene/monitor/src/java/org/apache/lucene/monitor/Monitor.java#L276],
wraps a single document into a array of documents. Hence, it always calls the
function, [match many
documents|https://github.com/apache/lucene-solr/blob/e376582e25d02f85b415eb1c0456f3fdc800fc84/lucene/monitor/src/java/org/apache/lucene/monitor/Monitor.java#L256],
which build a
[MultiDocumentBatch|https://github.com/apache/lucene-solr/blob/71d335ff688982cef10a648c914623c81ceeeeed/lucene/monitor/src/java/org/apache/lucene/monitor/DocumentBatch.java#L56]
rather than a
[SingletonDocumentBatch|https://github.com/apache/lucene-solr/blob/71d335ff688982cef10a648c914623c81ceeeeed/lucene/monitor/src/java/org/apache/lucene/monitor/DocumentBatch.java#L46].
The former uses ByteBuffersDirectory while later uses MemoryIndex.
As per documentation,
[MemoryIndex|https://lucene.apache.org/core/8_2_0/memory/index.html] is a
high-performance single-document main memory Apache Lucene fulltext search
index. Hence, Lucene monitor should use it when matching a single document.
The patch routes [match single
document|https://github.com/apache/lucene-solr/blob/e376582e25d02f85b415eb1c0456f3fdc800fc84/lucene/monitor/src/java/org/apache/lucene/monitor/Monitor.java#L276]
to a SingletonDocumentBatch.
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