rdblue commented on code in PR #4578:
URL: https://github.com/apache/iceberg/pull/4578#discussion_r863332308
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core/src/main/java/org/apache/iceberg/RemoveSnapshots.java:
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@@ -163,21 +188,100 @@ private TableMetadata internalApply() {
this.base = ops.refresh();
Set<Long> idsToRetain = Sets.newHashSet();
- List<Long> ancestorIds = SnapshotUtil.ancestorIds(base.currentSnapshot(),
base::snapshot);
- if (minNumSnapshots >= ancestorIds.size()) {
+ // Identify refs that should be removed
+ Set<String> expiredRefs = computeExpiredRefs(base.refs());
+ Set<Long> idsOfRetainedRefs = base.refs().entrySet().stream()
+ .filter(ref -> !expiredRefs.contains(ref.getKey()))
+ .map(refEntry -> refEntry.getValue().snapshotId())
+ .collect(Collectors.toSet());
+
+ for (Long idToRemove : idsToRemove) {
+ Preconditions.checkArgument(!idsOfRetainedRefs.contains(idToRemove),
+ "Cannot expire %s. There is a reference to it", idToRemove);
+ }
+
+ idsToRetain.addAll(idsOfRetainedRefs);
+
+ List<Map.Entry<String, SnapshotRef>> branches =
base.refs().entrySet().stream()
+ .filter(refEntry -> refEntry.getValue().isBranch())
+ .collect(Collectors.toList());
+
+ Set<Long> branchSnapshotsToRetain =
computeAllBranchSnapshotsToRetain(branches);
+ idsToRetain.addAll(branchSnapshotsToRetain);
+ TableMetadata.Builder updatedMetaBuilder = TableMetadata.buildFrom(base);
+ idsToRemove.addAll(base.snapshots().stream().map(Snapshot::snapshotId)
+ .filter(snapshot ->
!idsToRetain.contains(snapshot)).collect(Collectors.toSet()));
+ updatedMetaBuilder.removeSnapshots(idsToRemove);
+ expiredRefs.forEach(updatedMetaBuilder::removeRef);
Review Comment:
You should remove the refs before removing the snapshots, just in case we
add a consistency check later.
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