mikemccand commented on a change in pull request #179:
URL: https://github.com/apache/lucene/pull/179#discussion_r697880899
##########
File path:
lucene/facet/src/test/org/apache/lucene/facet/taxonomy/TestTaxonomyCombined.java
##########
@@ -366,9 +366,9 @@ public void testReaderBasic() throws Exception {
}
}
// (also test invalid ordinals:)
- assertNull(tr.getPath(-1));
- assertNull(tr.getPath(tr.getSize()));
- assertNull(tr.getPath(TaxonomyReader.INVALID_ORDINAL));
+ expectThrows(IllegalArgumentException.class, () -> tr.getPath(-1));
Review comment:
I guess this is a small API break? Previously this API leniently
returned `null` but now it throws exception. I think that's OK, but could you
advertise this in the `CHANGES.txt` entry?
##########
File path:
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/DirectoryTaxonomyReader.java
##########
@@ -351,12 +348,142 @@ public FacetLabel getPath(int ordinal) throws
IOException {
}
synchronized (categoryCache) {
- categoryCache.put(catIDInteger, ret);
+ categoryCache.put(ordinal, ret);
}
return ret;
}
+ private FacetLabel[] getPathFromCache(int... ordinals) {
+ FacetLabel[] facetLabels = new FacetLabel[ordinals.length];
+ // TODO LUCENE-10068: can we use an int-based hash impl, such as
IntToObjectMap,
+ // wrapped as LRU?
+ synchronized (categoryCache) {
+ for (int i = 0; i < ordinals.length; i++) {
+ facetLabels[i] = categoryCache.get(ordinals[i]);
+ }
+ }
+ return facetLabels;
+ }
+
+ /**
+ * Checks if the ordinals in the array are >=0 and < {@code
+ * DirectoryTaxonomyReader#indexReader.maxDoc()}
+ *
+ * @param ordinals Integer array of ordinals
+ * @throws IllegalArgumentException Throw an IllegalArgumentException if one
of the ordinals is
+ * out of bounds
+ */
+ private void checkOrdinalBounds(int... ordinals) throws
IllegalArgumentException {
+ for (int ordinal : ordinals) {
+ if (ordinal < 0 || ordinal >= indexReader.maxDoc()) {
+ throw new IllegalArgumentException(
+ "ordinal "
+ + ordinal
+ + " is out of the range of the indexReader "
+ + indexReader.toString()
+ + ". The maximum possible ordinal number is "
+ + (indexReader.maxDoc() - 1));
+ }
+ }
+ }
+
+ /**
+ * Returns an array of FacetLabels for a given array of ordinals.
+ *
+ * <p>This API is generally faster than iteratively calling {@link
#getPath(int)} over an array of
+ * ordinals. It uses the {@link #getPath(int)} method iteratively when it
detects that the index
+ * was created using StoredFields (with no performance gains) and uses
DocValues based iteration
+ * when the index is based on BinaryDocValues. Lucene switched to
BinaryDocValues in version 9.0
+ *
+ * @param ordinals Array of ordinals that are assigned to categories
inserted into the taxonomy
+ * index
+ */
+ @Override
+ public FacetLabel[] getBulkPath(int... ordinals) throws IOException {
+ ensureOpen();
+ checkOrdinalBounds(ordinals);
+
+ int ordinalsLength = ordinals.length;
+ FacetLabel[] bulkPath = new FacetLabel[ordinalsLength];
+ // remember the original positions of ordinals before they are sorted
+ int[] originalPosition = new int[ordinalsLength];
+ Arrays.setAll(originalPosition, IntUnaryOperator.identity());
+
+ getPathFromCache(ordinals);
+
+ /* parallel sort the ordinals and originalPosition array based on the
values in the ordinals array */
+ new InPlaceMergeSorter() {
+ @Override
+ protected void swap(int i, int j) {
+ int x = ordinals[i];
+ ordinals[i] = ordinals[j];
+ ordinals[j] = x;
+
+ x = originalPosition[i];
+ originalPosition[i] = originalPosition[j];
+ originalPosition[j] = x;
+ }
+
+ @Override
+ public int compare(int i, int j) {
+ return Integer.compare(ordinals[i], ordinals[j]);
+ }
+ }.sort(0, ordinalsLength);
+
+ int readerIndex;
+ int leafReaderMaxDoc = 0;
+ int leafReaderDocBase = 0;
+ LeafReader leafReader;
+ LeafReaderContext leafReaderContext;
+ BinaryDocValues values = null;
+ List<Integer> uncachedOrdinalPositions = new ArrayList<>();
+
+ for (int i = 0; i < ordinalsLength; i++) {
+ if (bulkPath[originalPosition[i]] == null) {
+ /*
+ If ordinals[i] >= leafReaderDocBase + leafReaderMaxDoc then we find
the next leaf that contains our ordinal.
+ Remember: ordinals[i] operates in the global ordinal space and hence
we add leafReaderDocBase to the leafReaderMaxDoc
+ (which is the maxDoc of the specific leaf)
+ */
+ if (values == null || ordinals[i] >= leafReaderDocBase +
leafReaderMaxDoc) {
+
+ readerIndex = ReaderUtil.subIndex(ordinals[i], indexReader.leaves());
+ leafReaderContext = indexReader.leaves().get(readerIndex);
+ leafReader = leafReaderContext.reader();
+ leafReaderMaxDoc = leafReader.maxDoc();
+ leafReaderDocBase = leafReaderContext.docBase;
+ values = leafReader.getBinaryDocValues(Consts.FULL);
+
+ /*
+ If the index is constructed with the older StoredFields it will not
have any BinaryDocValues field and will return null
+ */
+ if (values == null) {
Review comment:
It's sort of weird to do this check per-segment, since we can know up
front, based on indexed created version, whether it's stored fields or doc
values? I.e. this is not a segment by segment decision. But let's do it in
follow-on issue. I think this one is ready!
##########
File path:
lucene/facet/src/test/org/apache/lucene/facet/taxonomy/directory/TestBackwardsCompatibility.java
##########
@@ -89,6 +89,28 @@ private void createNewTaxonomyIndex(String dirName) throws
IOException {
dir.close();
}
+ // Opens up a pre-existing index and tries to run getBulkPath on it
+ public void testGetBulkPathOnOlderCodec() throws Exception {
+ Path indexDir = createTempDir(oldTaxonomyIndexName);
+ TestUtil.unzip(getDataInputStream(oldTaxonomyIndexName + ".zip"),
indexDir);
+ Directory dir = newFSDirectory(indexDir);
+
+ DirectoryTaxonomyWriter writer = new DirectoryTaxonomyWriter(dir);
+ DirectoryTaxonomyReader reader = new DirectoryTaxonomyReader(writer);
+
+ FacetLabel[] facetLabels = {
+ new FacetLabel("a"), new FacetLabel("b"),
+ };
+ int[] ordinals =
+ new int[] {reader.getOrdinal(facetLabels[0]),
reader.getOrdinal(facetLabels[1])};
+ // The zip file already contains a category "a" and a category "b" stored
with the older
Review comment:
Maybe the test should assert that `ordinals[0] != -1` and same for
`ordinals[1]`?
##########
File path:
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/DirectoryTaxonomyReader.java
##########
@@ -351,12 +348,140 @@ public FacetLabel getPath(int ordinal) throws
IOException {
}
synchronized (categoryCache) {
- categoryCache.put(catIDInteger, ret);
+ categoryCache.put(ordinal, ret);
}
return ret;
}
+ private FacetLabel[] getPathFromCache(int... ordinals) {
+ FacetLabel[] facetLabels = new FacetLabel[ordinals.length];
+ // TODO LUCENE-10068: can we use an int-based hash impl, such as
IntToObjectMap,
+ // wrapped as LRU?
+ synchronized (categoryCache) {
+ for (int i = 0; i < ordinals.length; i++) {
+ facetLabels[i] = categoryCache.get(ordinals[i]);
+ }
+ }
+ return facetLabels;
+ }
+
+ /**
+ * Checks if the ordinals in the array are >=0 and < {@code
+ * DirectoryTaxonomyReader#indexReader.maxDoc()}
+ *
+ * @param ordinals Integer array of ordinals
+ * @throws IllegalArgumentException Throw an IllegalArgumentException if one
of the ordinals is
+ * out of bounds
+ */
+ private void checkOrdinalBounds(int... ordinals) throws
IllegalArgumentException {
+ for (int ordinal : ordinals) {
+ if (ordinal < 0 || ordinal >= indexReader.maxDoc()) {
+ throw new IllegalArgumentException(
+ "ordinal "
+ + ordinal
+ + " is out of the range of the indexReader "
+ + indexReader.toString()
+ + ". The maximum possible ordinal number is "
+ + (indexReader.maxDoc() - 1));
+ }
+ }
+ }
+
+ /**
+ * Returns an array of FacetLabels for a given array of ordinals.
+ *
+ * <p>This API is generally faster than iteratively calling {@link
#getPath(int)} over an array of
+ * ordinals. It uses the {@link #getPath(int)} method iteratively when it
detects that the index
+ * was created using StoredFields (with no performance gains) and uses
DocValues based iteration
+ * when the index is based on BinaryDocValues. Lucene switched to
BinaryDocValues in version 9.0
+ *
+ * @param ordinals Array of ordinals that are assigned to categories
inserted into the taxonomy
+ * index
+ */
+ @Override
+ public FacetLabel[] getBulkPath(int... ordinals) throws IOException {
+ ensureOpen();
+ checkOrdinalBounds(ordinals);
+
+ int ordinalsLength = ordinals.length;
+ FacetLabel[] bulkPath = new FacetLabel[ordinalsLength];
+ // remember the original positions of ordinals before they are sorted
+ int[] originalPosition = new int[ordinalsLength];
+ Arrays.setAll(originalPosition, IntUnaryOperator.identity());
+
+ getPathFromCache(ordinals);
Review comment:
Yeah good point ...
Though I do think it's weird that we set `categoryCache = null` in `doClose`
because this means if the application is (illegally) still trying to do
faceting in one query thread, while another thread closes, then the query
threads will hit `NullPointerException`. I think it'd be better to make
`categoryCache` `final` and throw `AlreadyClosedException`. But let's not do
that here/now! Can you open a followon issue?
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