amogh-jahagirdar commented on code in PR #4578:
URL: https://github.com/apache/iceberg/pull/4578#discussion_r873228264
##########
core/src/main/java/org/apache/iceberg/RemoveSnapshots.java:
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@@ -155,27 +168,93 @@ public List<Snapshot> apply() {
TableMetadata updated = internalApply();
List<Snapshot> removed = Lists.newArrayList(base.snapshots());
removed.removeAll(updated.snapshots());
-
return removed;
}
private TableMetadata internalApply() {
this.base = ops.refresh();
+ if (base.refs().isEmpty()) {
+ return base;
+ }
Set<Long> idsToRetain = Sets.newHashSet();
- List<Long> ancestorIds = SnapshotUtil.ancestorIds(base.currentSnapshot(),
base::snapshot);
- if (minNumSnapshots >= ancestorIds.size()) {
- idsToRetain.addAll(ancestorIds);
- } else {
- idsToRetain.addAll(ancestorIds.subList(0, minNumSnapshots));
+ // Identify refs that should be removed
+ Map<String, SnapshotRef> retainedRefs = computeRetainedRefs(base.refs());
+ Set<Long> retainedRefIds = retainedRefs.entrySet().stream()
+ .map(refEntry -> refEntry.getValue().snapshotId())
+ .collect(Collectors.toSet());
+
+ for (long idToRemove : idsToRemove) {
+ Preconditions.checkArgument(!retainedRefIds.contains(idToRemove),
+ "Cannot expire %s. There is a reference to it", idToRemove);
Review Comment:
I've updated to maintain the refs associated with a given snapshot ID so
that the exception message could be clearer. @rdblue let me know what you
think!
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