rdblue commented on a change in pull request #388: Handle rollback in snapshot
expiration
URL: https://github.com/apache/incubator-iceberg/pull/388#discussion_r314106205
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File path: core/src/main/java/org/apache/iceberg/RemoveSnapshots.java
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@@ -120,56 +123,128 @@ public void commit() {
}
});
- LOG.info("Committed snapshot changes; cleaning up expired manifests and
data files.");
+ cleanExpiredSnapshots();
+ }
+ private void cleanExpiredSnapshots() {
// clean up the expired snapshots:
// 1. Get a list of the snapshots that were removed
// 2. Delete any data files that were deleted by those snapshots and are
not in the table
// 3. Delete any manifests that are no longer used by current snapshots
// 4. Delete the manifest lists
+ TableMetadata current = ops.refresh();
+
+ Set<Long> validIds = Sets.newHashSet();
+ for (Snapshot snapshot : current.snapshots()) {
+ validIds.add(snapshot.snapshotId());
+ }
+
+ Set<Long> expiredIds = Sets.newHashSet();
+ for (Snapshot snapshot : base.snapshots()) {
+ long snapshotId = snapshot.snapshotId();
+ if (!validIds.contains(snapshotId)) {
+ // the snapshot was expired
+ LOG.info("Expired snapshot: {}", snapshot);
+ expiredIds.add(snapshotId);
+ }
+ }
+
+ if (expiredIds.isEmpty()) {
+ // if no snapshots were expired, skip cleanup
+ return;
+ }
+
+ LOG.info("Committed snapshot changes; cleaning up expired manifests and
data files.");
+
+ cleanExpiredFiles(current.snapshots(), validIds, expiredIds);
+ }
+
+ @SuppressWarnings("checkstyle:CyclomaticComplexity")
Review comment:
I tried to break this up as much as possible, but I don't think it is worth
the changes to break up this method. The loops produce too many intermediate
sets that would need to be returned.
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