deniskuzZ commented on code in PR #5712:
URL: https://github.com/apache/hive/pull/5712#discussion_r2016152736
##########
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/writer/WriterRegistry.java:
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@@ -36,13 +36,10 @@ public static Map<String, List<HiveIcebergWriter>>
removeWriters(TaskAttemptID t
}
public static void registerWriter(TaskAttemptID taskAttemptID, String
tableName, HiveIcebergWriter writer) {
- writers.putIfAbsent(taskAttemptID, Maps.newConcurrentMap());
+ Map<String, List<HiveIcebergWriter>> outputWriters =
+ writers.computeIfAbsent(taskAttemptID, k -> Maps.newConcurrentMap());
- Map<String, List<HiveIcebergWriter>> writersOfTableMap =
writers.get(taskAttemptID);
- writersOfTableMap.putIfAbsent(tableName, Lists.newArrayList());
-
- List<HiveIcebergWriter> writerList = writersOfTableMap.get(tableName);
- writerList.add(writer);
+ outputWriters.computeIfAbsent(tableName, k -> new
CopyOnWriteArrayList<>()).add(writer);
Review Comment:
Writers registration happens during task execution and removal only after
the task commit.
During the task commit, we create the commit manifest file by iterating over
all the registered in the task writers.
The issue is that very rarely, some of the data files aren't added to the
task commit file.
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