Kaixuan-Duan commented on code in PR #3132:
URL: https://github.com/apache/fluss/pull/3132#discussion_r3224026145
##########
fluss-server/src/main/java/org/apache/fluss/server/kv/RemoteLogFetcher.java:
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@@ -333,12 +555,202 @@ private void advance() {
}
}
+ /**
+ * Obtain the local file for {@code segment}, ideally reusing a
prefetched download. On
+ * success the ring head is consumed and a refill is triggered, so the
window stays full as
+ * long as more segments remain.
+ */
+ private File fetchSegmentFile(RemoteLogSegment segment) throws
IOException {
+ // Invariant: fillPrefetchWindow() and advance() walk the same
pre-filtered
+ // `segments` list in strict order with identical skip rules;
consumption is
+ // single-threaded FIFO; prefetchNum >= 1 (Math.max(1, ...) in the
ctor). So
+ // the ring head is *always* the segment advance() is asking for.
+ int headSlot = nextConsumeIndex % prefetchNum;
+ RemoteLogSegment headSegment = prefetchSegments[headSlot];
+ assert isSameSegmentId(segment, headSegment)
Review Comment:
Agreed. Fixed.
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