RussellSpitzer commented on code in PR #15006:
URL: https://github.com/apache/iceberg/pull/15006#discussion_r2695186490
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core/src/main/java/org/apache/iceberg/MergingSnapshotProducer.java:
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@@ -1073,6 +1088,139 @@ private List<ManifestFile> newDeleteFilesAsManifests() {
return cachedNewDeleteManifests;
}
+ // Merge duplicates, internally takes care of updating newDeleteFilesBySpec
to remove
+ // duplicates and add the newly merged DV
+ private void mergeDVsAndWrite() {
+ Map<Integer, List<MergedDVContent>> mergedIndicesBySpec =
Maps.newConcurrentMap();
+
+ Tasks.foreach(dvsByReferencedFile.entrySet())
+ .executeWith(ThreadPools.getDeleteWorkerPool())
+ .stopOnFailure()
+ .throwFailureWhenFinished()
+ .run(
+ entry -> {
+ String referencedLocation = entry.getKey();
+ DeleteFileSet dvsToMerge = entry.getValue();
+ // Nothing to merge
+ if (dvsToMerge.size() < 2) {
+ return;
+ }
+
+ MergedDVContent merged = mergePositions(referencedLocation,
dvsToMerge);
+
+ mergedIndicesBySpec
+ .computeIfAbsent(
+ merged.specId, spec ->
Collections.synchronizedList(Lists.newArrayList()))
+ .add(merged);
+ });
+
+ // Update newDeleteFilesBySpec to remove all the duplicates
+ mergedIndicesBySpec.forEach(
+ (specId, mergedDVContent) -> {
+ mergedDVContent.stream()
+ .map(content -> content.mergedDVs)
+ .forEach(duplicateDVs ->
newDeleteFilesBySpec.get(specId).removeAll(duplicateDVs));
+ });
+
+ writeMergedDVs(mergedIndicesBySpec);
+ }
+
+ // Produces a Puffin per partition spec containing the merged DVs for that
spec
+ private void writeMergedDVs(Map<Integer, List<MergedDVContent>>
mergedDVContentBySpec) {
+ Map<Integer, DeleteFileSet> mergedDVsBySpec = Maps.newHashMap();
+
+ mergedDVContentBySpec.forEach(
+ (specId, mergedDVsForSpec) -> {
+ try (DVFileWriter dvFileWriter =
+ new BaseDVFileWriter(
+ OutputFileFactory.builderFor(ops(), spec(specId),
FileFormat.PUFFIN, 1, 1)
+ .build(),
+ path -> null)) {
+
+ for (MergedDVContent mergedDV : mergedDVsForSpec) {
+ LOG.warn(
+ "Merged {} duplicate deletion vectors for data file {} in
table {}. The merged DVs are orphaned, and writers should merge DVs per file
before committing",
Review Comment:
I hate english, I feel "merged DVs" refers to the dvs that were merged?
Maybe
Merged DVs were created from duplicate deletion vectors but the duplicates
have been left as Orphan files. Writers should merge DV's prior to committing
Although this raises the question of why we aren't just deleting the
duplicates?
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