mjsax commented on code in PR #22614:
URL: https://github.com/apache/kafka/pull/22614#discussion_r3606234170
##########
streams/src/main/java/org/apache/kafka/streams/processor/internals/StoreChangelogReader.java:
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@@ -730,6 +739,23 @@ private int restoreChangelog(final Task task, final
ChangelogMetadata changelogM
return numRecords;
}
+ /**
+ * Record restoration progress: restore-total/restore-rate advance by the
records restored
+ * ({@code numRecords}), while the remaining-records metric is decremented
by the offset slots
+ * between {@code previousOffset} (or {@code restoreStartOffset} if null)
and {@code restoredToOffset}.
+ * Measuring the latter in offset slots accounts for offsets the restore
consumer never returns
+ * (transaction markers, compacted records) so it reaches exactly zero on
completion.
+ */
+ private void recordRestorationProgress(final Task task,
+ final ChangelogMetadata
changelogMetadata,
+ final long numRecords,
+ final Long previousOffset,
+ final long restoredToOffset) {
+ final long restoredFrom = previousOffset == null ?
changelogMetadata.restoreStartOffset - 1 : previousOffset;
Review Comment:
Why do we need `-1` and not just `changelogMetadata.restoreStartOffset`
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