uschindler commented on code in PR #13570:
URL: https://github.com/apache/lucene/pull/13570#discussion_r1678835899
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lucene/core/src/java21/org/apache/lucene/store/MemorySegmentIndexInputProvider.java:
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@@ -125,4 +134,31 @@ private final MemorySegment[] map(
}
return segments;
}
+
+ public ConcurrentHashMap<String, RefCountedSharedArena> attachment() {
+ return new ConcurrentHashMap<>();
+ }
+
+ /**
+ * Gets an arena for the give path, potentially aggregating files from the
same segment into a
+ * single ref counted shared arena. A ref counted shared arena, if created
will be added to the
+ * given arenas map.
+ */
+ static Arena getSharedArena(Path p, ConcurrentHashMap<String,
RefCountedSharedArena> arenas) {
+ String filename = p.getFileName().toString();
+ String segmentName = IndexFileNames.parseSegmentName(filename);
+ if (filename.length() == segmentName.length()) {
+ // no segment found; just use a shared segment
+ return Arena.ofShared();
Review Comment:
This is a new Arena so it's private to that file. It's basically a fallback
to current behaviour without PR. It is not a "global arena". It is a private
one for this single file. Like in main branch.
Actually using "" as segment name would break it here as this would group
all indexinputs into the same arena.
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