aokolnychyi commented on code in PR #8621:
URL: https://github.com/apache/iceberg/pull/8621#discussion_r1337601468
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spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/SparkWriteConf.java:
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@@ -174,12 +174,17 @@ public long targetDataFileSize() {
.parse();
}
- public boolean fanoutWriterEnabled() {
+ public boolean useFanoutWriter(SparkWriteRequirements writeRequirements) {
+ boolean defaultValue = !writeRequirements.hasOrdering();
Review Comment:
Actually, we may want to keep it this way.
Another use case that may benefit from the current approach is SPJ. There,
users set the distribution mode to none. They would get a super expensive local
sort and spill without explicitly enabling fanout writers. I think that's a
more realistic use case than setting to `none` and generating tons of files per
task. If the user sets it to `none` explicitly, they are probably OK with the
number of produced files, which hints it is not a crazy number. So why do a
local sort for them?
We generally preferred safe options vs more performant and it meant more
configs required to improve the performance. I'd say let's turn that around.
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