ChrisHegarty commented on code in PR #16418:
URL: https://github.com/apache/lucene/pull/16418#discussion_r3664807755
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lucene/core/src/java/org/apache/lucene/index/IndexWriterConfig.java:
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@@ -324,6 +338,43 @@ public boolean getReaderPooling() {
return readerPooling;
}
+ /**
+ * When enabled, a doc-values update that only sets values (no removals) is
written as a sparse
+ * "delta" generation holding just the updated documents and overlaid on the
existing column at
+ * read time, rather than rewriting the whole column. This trades some read
cost for much lower
+ * write amplification on frequently updated fields. Enabled by default;
pass {@code false} to
+ * keep the classic full-column rewrite.
+ *
+ * <p>A commit whose segments carry sparse delta generations is written at a
bumped segments-file
Review Comment:
pedantically. There is already a notion of generations. We could use a
different term to avoid potential confusion with it, e.g. "sparse delta
layers", or some such?
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