uschindler commented on code in PR #13535:
URL: https://github.com/apache/lucene/pull/13535#discussion_r1665828693
##########
lucene/core/src/java/org/apache/lucene/index/ReadersAndUpdates.java:
##########
@@ -578,7 +578,8 @@ public synchronized boolean writeFieldUpdates(
// IndexWriter.commitMergedDeletes).
final SegmentReader reader;
if (this.reader == null) {
- reader = new SegmentReader(info, indexCreatedVersionMajor,
IOContext.READONCE);
+ IOContext context = info.info.getUseCompoundFile() ? IOContext.DEFAULT
: IOContext.READONCE;
Review Comment:
This looks correct with READONCE, as we close the segment reader down there,
so it is only open for short time and we never look into it by different
threads.
So I think we can revert that change and use READONCE. It is still a bit
expensive to mmap a huge CFS file just to read a few bytes.
##########
lucene/core/src/java/org/apache/lucene/index/PendingSoftDeletes.java:
##########
@@ -232,7 +232,7 @@ private FieldInfos readFieldInfos() throws IOException {
segInfo
.getCodec()
.compoundFormat()
- .getCompoundReader(segInfo.dir, segInfo,
IOContext.READONCE);
+ .getCompoundReader(segInfo.dir, segInfo,
IOContext.DEFAULT);
Review Comment:
READONCE is also fine here, because we only open the CFS file for very short
time and close it down there. So as said before, this is a bit of overhead to
mmap a large CFS file just to read fieldinfos.
We should think about this a bit in a separate issue. It is good you catched
it.
##########
lucene/core/src/java21/org/apache/lucene/store/MemorySegmentIndexInput.java:
##########
@@ -53,6 +53,7 @@ abstract class MemorySegmentIndexInput extends IndexInput
final long length;
final long chunkSizeMask;
final int chunkSizePower;
+ final boolean confined;
Review Comment:
We could also pass down the IOContext for more flexibility in the future.
For now a single boolean is fine!
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