jimczi commented on code in PR #16883:
URL: https://github.com/apache/lucene/pull/16883#discussion_r4350743536
##########
lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90CompoundReader.java:
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@@ -176,28 +182,50 @@ 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);
+ synchronized (this) {
+ Mapping mapping = mappingFor(id, context);
+ IndexInput slice = mapping.data.slice(name, entry.offset, entry.length,
context);
+ mapping.firstOpens.putIfAbsent(id, slice);
Review Comment:
A mapping serves every inner file opened on it, so it can't be keyed by
file. I inlined mappingFor into one loop in openInput: reuse the first mapping
where the file is not open yet or its slice serves the context, otherwise map
the data file again.
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