amogh-jahagirdar commented on code in PR #15006:
URL: https://github.com/apache/iceberg/pull/15006#discussion_r2687249525
##########
core/src/main/java/org/apache/iceberg/MergingSnapshotProducer.java:
##########
@@ -1060,19 +1096,113 @@ 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();
+ mergedDVs.forEach(
+ (referencedFile, newDV) -> {
+ DeleteFileSet duplicateDVs =
duplicateDVsForDataFile.get(referencedFile);
+ DeleteFileSet allDeleteFilesForSpec =
newDeleteFilesBySpec.get(newDV.specId());
+ 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",
+ duplicateDVs.size(),
+ referencedFile,
+ tableName);
+ allDeleteFilesForSpec.removeAll(duplicateDVs);
+ allDeleteFilesForSpec.add(newDV);
+ });
+ }
+
newDeleteFilesBySpec.forEach(
(specId, deleteFiles) -> {
PartitionSpec spec = ops().current().spec(specId);
+ deleteFiles.forEach(file -> addedFilesSummary.addedFile(spec,
file));
List<ManifestFile> newDeleteManifests =
writeDeleteManifests(deleteFiles, spec);
cachedNewDeleteManifests.addAll(newDeleteManifests);
});
this.hasNewDeleteFiles = false;
+ this.duplicateDVsForDataFile.clear();
}
return cachedNewDeleteManifests;
}
+ // Returns the merged DV for a given data file that had duplicate DVs
Review Comment:
You're right, I'll make this clearer that it's actually doing an I/O.
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