zacharymorn commented on a change in pull request #180:
URL: https://github.com/apache/lucene/pull/180#discussion_r661242673
##########
File path: lucene/core/src/java/org/apache/lucene/index/BaseCompositeReader.java
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@@ -112,10 +112,29 @@ protected BaseCompositeReader(R[] subReaders,
Comparator<R> subReadersSorter) th
}
@Override
- public final Fields getTermVectors(int docID) throws IOException {
- ensureOpen();
- final int i = readerIndex(docID); // find subreader num
- return subReaders[i].getTermVectors(docID - starts[i]); // dispatch to
subreader
+ public final TermVectors getTermVectorsReader() {
+ TermVectors[] termVectors = new TermVectors[subReaders.length];
+
+ // subReaders is a collection of segmentReaders
+ for (int i = 0; i < subReaders.length; i++) {
+ // the getTermVectorsReader would clone a new instance, hence saving it
into an array
+ // to avoid re-cloning from direct subReaders[i].getTermVectorsReader()
call
+ termVectors[i] = subReaders[i].getTermVectorsReader();
+ }
+
+ return new TermVectors() {
Review comment:
I've implemented the lazy-init approach in the latest commit and it
passed the existing tests (in particular, `TestMultiThreadTermVectors`), so I
think it should be safe for threaded situation? One downside from this approach
I see though is that since `null` was used to indicate both TV not available
and not initialized, lazy-init will require repeated
`subReaders[i].getTermVectorsReader()` calls to get TV reader in the same
segment if that segment simply doesn't contain any TV index.
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