nastra commented on code in PR #11825:
URL: https://github.com/apache/iceberg/pull/11825#discussion_r1905666756
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core/src/main/java/org/apache/iceberg/actions/SizeBasedDataRewriter.java:
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@@ -84,13 +86,30 @@ private boolean shouldRewrite(List<FileScanTask> group) {
return enoughInputFiles(group)
|| enoughContent(group)
|| tooMuchContent(group)
- || anyTaskHasTooManyDeletes(group);
+ || anyTaskHasTooManyDeletes(group)
+ || anyTaskHasTooHighDeleteRatio(group);
}
private boolean anyTaskHasTooManyDeletes(List<FileScanTask> group) {
return group.stream().anyMatch(this::tooManyDeletes);
}
+ private boolean anyTaskHasTooHighDeleteRatio(List<FileScanTask> group) {
+ return group.stream().anyMatch(this::tooHighDeleteRatio);
+ }
+
+ private boolean tooHighDeleteRatio(FileScanTask task) {
+ if (ContentFileUtil.containsSingleDV(task.deletes())) {
+ DeleteFile file = Iterables.getOnlyElement(task.deletes());
+ double deletedRecords = (double) Math.min(file.recordCount(),
task.file().recordCount());
+ double deleteRatio = deletedRecords / task.file().recordCount();
Review Comment:
@singhpk234 the min calculation here is really only used for the case where
we have more deletes than actual records, which is covered by
`testDataFilesRewrittenWithMaxDeleteRatio()` (I don't think there's currently
any logic that prevents creating more deletes than the amount of records in a
data file and so we'd like to have the delete ratio not be greater than 1.0 in
this case
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