geruh commented on code in PR #15006:
URL: https://github.com/apache/iceberg/pull/15006#discussion_r2680349443
##########
core/src/main/java/org/apache/iceberg/MergingSnapshotProducer.java:
##########
@@ -1060,19 +1086,119 @@ private List<ManifestFile> newDeleteFilesAsManifests()
{
}
if (cachedNewDeleteManifests.isEmpty()) {
+ // Found duplicates, merge them and update newDeleteFilesBySpec to
remove duplicates and add
+ // the new merged one
+ if (!duplicateDVsForDataFile.isEmpty()) {
+ Map<String, DeleteFile> mergedDVs = mergeDuplicateDVs();
+ for (Map.Entry<String, DeleteFile> mergedDV : mergedDVs.entrySet()) {
+ String referencedFile = mergedDV.getKey();
+ DeleteFile newDV = mergedDV.getValue();
+ DeleteFileSet duplicateDVs =
duplicateDVsForDataFile.get(referencedFile);
+ DeleteFileSet allDeleteFilesForSpec =
newDeleteFilesBySpec.get(newDV.specId());
+ allDeleteFilesForSpec.removeAll(duplicateDVs);
+ allDeleteFilesForSpec.add(newDV);
+ }
+ }
+
newDeleteFilesBySpec.forEach(
(specId, deleteFiles) -> {
PartitionSpec spec = ops().current().spec(specId);
+ // Update summaries for all added delete files including eq.
deletes for this partition
+ // spec
+ deleteFiles.forEach(file -> addedFilesSummary.addedFile(spec,
file));
List<ManifestFile> newDeleteManifests =
writeDeleteManifests(deleteFiles, spec);
cachedNewDeleteManifests.addAll(newDeleteManifests);
});
this.hasNewDeleteFiles = false;
+ this.duplicateDVsForDataFile.clear();
}
return cachedNewDeleteManifests;
}
+ // Find duplicate DVs for a given partition spec, and return a Pair of the
new DVs and the DVs
+ // that were merged
+ private Map<String, DeleteFile> mergeDuplicateDVs() {
+ Map<String, DeleteFile> mergedDVs = Maps.newConcurrentMap();
+ Tasks.foreach(duplicateDVsForDataFile.entrySet())
+ .executeWith(ThreadPools.getDeleteWorkerPool())
+ .stopOnFailure()
+ .throwFailureWhenFinished()
+ .run(
+ dvsToMergeForDataFile -> {
+ String referencedLocation = dvsToMergeForDataFile.getKey();
+ mergedDVs.put(
+ referencedLocation,
+ mergeAndWriteDV(referencedLocation,
dvsToMergeForDataFile.getValue()));
+ });
+
+ return mergedDVs;
+ }
+
+ private DeleteFile mergeAndWriteDV(String referencedDataFile, DeleteFileSet
dvs) {
+ Iterator<DeleteFile> dvIterator = dvs.iterator();
+ DeleteFile firstDV = dvIterator.next();
+ PositionDeleteIndex positionDeleteIndex =
+ Deletes.readDV(firstDV, ops().io(), ops().encryption());
+ PartitionSpec spec = spec(firstDV.specId());
+ while (dvIterator.hasNext()) {
+ DeleteFile dv = dvIterator.next();
+ Preconditions.checkArgument(
+ Objects.equals(dv.dataSequenceNumber(),
firstDV.dataSequenceNumber()),
+ "Cannot merge duplicate added DVs when data sequence numbers are
different,"
+ + "expected all to be added with sequence %s, but got %s",
+ firstDV.dataSequenceNumber(),
+ dv.dataSequenceNumber());
+ Preconditions.checkArgument(
+ dv.specId() == firstDV.specId(),
+ "Cannot merge duplicate added DVs when partition specs are
different,"
+ + "expected all to be added with spec %s, but got %s",
+ firstDV.specId(),
+ dv.specId());
+ Preconditions.checkArgument(
+ Objects.equals(dv.partition(), firstDV.partition()),
+ "Cannot merge duplicate added DVs when partition tuples are
different");
+ positionDeleteIndex.merge(Deletes.readDV(dv, ops().io(),
ops().encryption()));
+ }
Review Comment:
WDYT about adding some logging? I see two benefits:
1. It would make it clear to users when they have N DVs that were merged and
are now orphaned in storage, so they know they can safely run orphan file
removal.
2. We assume this case is rare, but logging would let us validate that
assumption by giving us visibility into how often DV merges actually happen and
provide insight into the operation i.e. a slow commit
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