szehon-ho commented on code in PR #7653:
URL: https://github.com/apache/iceberg/pull/7653#discussion_r1266249371
##########
spark/v3.1/spark/src/main/java/org/apache/iceberg/spark/actions/BaseDeleteOrphanFilesSparkAction.java:
##########
@@ -296,4 +334,160 @@ private static FlatMapFunction<Iterator<String>, String>
listDirsRecursively(
return files.iterator();
};
}
+
+ @VisibleForTesting
+ static List<String> findOrphanFiles(
+ SparkSession spark,
+ Dataset<Row> actualFileDF,
+ Dataset<Row> validFileDF,
+ Map<String, String> equalSchemes,
+ Map<String, String> equalAuthorities,
+ PrefixMismatchMode prefixMismatchMode) {
+ Dataset<FileMetadata> actualFileMetadataDS =
+ actualFileDF.mapPartitions(
+ toFileMetadata(equalSchemes, equalAuthorities),
Encoders.bean(FileMetadata.class));
+ Dataset<FileMetadata> validFileMetadataDS =
+ validFileDF.mapPartitions(
+ toFileMetadata(equalSchemes, equalAuthorities),
Encoders.bean(FileMetadata.class));
+
+ SetAccumulator<Pair<String, String>> conflicts = new SetAccumulator<>();
+ spark.sparkContext().register(conflicts);
+
+ Column joinCond =
actualFileMetadataDS.col("path").equalTo(validFileMetadataDS.col("path"));
+
+ List<String> orphanFiles =
+ actualFileMetadataDS
+ .joinWith(validFileMetadataDS, joinCond, "leftouter")
+ .mapPartitions(findOrphanFiles(prefixMismatchMode, conflicts),
Encoders.STRING())
+ .collectAsList();
+
+ if (prefixMismatchMode == PrefixMismatchMode.ERROR &&
!conflicts.value().isEmpty()) {
+ throw new ValidationException(
+ "Unable to determine whether certain files are orphan. "
+ + "Metadata references files that match listed/provided files
except for authority/scheme. "
+ + "Please, inspect the conflicting authorities/schemes and
provide which of them are equal "
+ + "by further configuring the action via equalSchemes() and
equalAuthorities() methods. "
+ + "Set the prefix mismatch mode to 'NONE' to ignore remaining
locations with conflicting "
+ + "authorities/schemes or to 'DELETE' iff you are ABSOLUTELY
confident that remaining conflicting "
+ + "authorities/schemes are different. It will be impossible to
recover deleted files. "
+ + "Conflicting authorities/schemes: %s.",
+ conflicts.value());
+ }
+
+ return orphanFiles;
+ }
+
+ private static MapPartitionsFunction<Tuple2<FileMetadata, FileMetadata>,
String> findOrphanFiles(
+ PrefixMismatchMode mode, SetAccumulator<Pair<String, String>> conflicts)
{
+ return rows -> {
+ Iterator<String> transformed =
+ Iterators.transform(
+ rows,
+ row -> {
+ FileMetadata actual = row._1;
+ FileMetadata valid = row._2;
+
+ if (valid == null) {
+ return actual.location;
+ }
+
+ boolean schemeMatch =
+ Strings.isNullOrEmpty(valid.scheme)
+ || valid.scheme.equalsIgnoreCase(actual.scheme);
+ boolean authorityMatch =
+ Strings.isNullOrEmpty(valid.authority)
+ || valid.authority.equalsIgnoreCase(actual.authority);
+
+ if ((!schemeMatch || !authorityMatch) && mode ==
PrefixMismatchMode.DELETE) {
+ return actual.location;
+ } else {
+ if (!schemeMatch) {
+ conflicts.add(Pair.of(valid.scheme, actual.scheme));
+ }
+ if (!authorityMatch) {
+ conflicts.add(Pair.of(valid.authority, actual.authority));
+ }
+ }
+
+ return null;
+ });
+ return Iterators.filter(transformed, Objects::nonNull);
+ };
+ }
+
+ private static Map<String, String> flattenMap(Map<String, String> map) {
+ Map<String, String> flattenedMap = Maps.newHashMap();
+ if (map != null) {
+ for (String key : map.keySet()) {
+ String value = map.get(key);
+ for (String splitKey : COMMA.split(key)) {
+ flattenedMap.put(splitKey.trim(), value.trim());
+ }
+ }
+ }
+ return flattenedMap;
+ }
+
+ private static MapPartitionsFunction<Row, FileMetadata> toFileMetadata(
+ Map<String, String> equalSchemesMap, Map<String, String>
equalAuthoritiesMap) {
+ return rows ->
+ Iterators.transform(
Review Comment:
Same, can be one line like Spark 3.2
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