thecoop commented on code in PR #16883:
URL: https://github.com/apache/lucene/pull/16883#discussion_r4361487693
##########
lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90CompoundReader.java:
##########
@@ -176,28 +185,33 @@ public IndexInput openInput(String name, IOContext
context) throws IOException {
+ entries.keySet()
+ ")");
}
- IndexInput data = context.context() == IOContext.Context.MERGE ?
mergeHandle() : handle;
- return data.slice(name, entry.offset, entry.length, context);
- }
-
- /**
- * A merge reads through a mapping of its own, so the access it advises does
not replace the
- * advice of searches reading the same inner files. Merges of this segment
share it. Like the
- * search mapping, it is opened without advice: each inner file is advised
on its own region.
- */
- private synchronized IndexInput mergeHandle() throws IOException {
- if (closed) {
- throw new AlreadyClosedException("this Directory is closed");
- }
- if (mergeHandle == null) {
- try {
- mergeHandle = directory.openInput(dataFileName, IOContext.DEFAULT);
- } catch (@SuppressWarnings("unused") FileNotFoundException |
NoSuchFileException e) {
- // an open reader outlives its files, so fall back to the mapping it
already holds
- mergeHandle = handle;
+ synchronized (this) {
+ if (closed) {
+ throw new AlreadyClosedException("this Directory is closed");
+ }
+ List<Slice> fileSlices = slices.computeIfAbsent(id, _ -> new
ArrayList<>());
+ int copy = 0;
+ while (copy < fileSlices.size()
+ && fileSlices.get(copy).input().isEfficientFor(context) == false) {
+ copy++;
+ }
+ // each slice of an inner file is on its own copy of the data file, so
it keeps its own advice
+ if (copy == fileSlices.size()) {
+ try {
+ if (copy == data.size()) {
+ // without advice, like handle, so inner files advise their own
pages
+ data.add(directory.openInput(dataFileName, IOContext.DEFAULT));
+ }
+ IndexInput input = data.get(copy).slice(name, entry.offset,
entry.length, context);
Review Comment:
Yes, thats much clearer!
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