techdocsmith commented on a change in pull request #11506:
URL: https://github.com/apache/druid/pull/11506#discussion_r698651218
##########
File path: docs/ingestion/native-batch.md
##########
@@ -369,11 +369,16 @@ Druid currently supports only one partition function.
The Parallel task will use one subtask when you set `maxNumConcurrentSubTasks`
to 1.
-> Be aware that, with this technique, segment sizes could be skewed if your
chosen `partitionDimension` is also skewed in source data.
-
-> While it is technically possible to concatenate multiple dimensions into a
single new dimension
-> that you go on to specify in `partitionDimension`, remember that you _must_
then use this newly concatenated dimension at query time
-> in order for segment pruning to be effective.
+When you use this technique to partition your data, segment sizes may be
unequally distributed if the data
+in your `partitionDimension` is also unequally distributed. Therefore, to
avoid imbalance in data layout,
+ review the distribution of values in your source data before deciding on a
partitioning strategy.
+
+For segment pruning to be effective and translate into better query
performance, you must use
+the `partitionDimension` at query time. You can concatenate values from
multiple
+dimensions into a new dimension to use as the `partitionDimension`. In this
case, you
+must use that new dimension in your native filter `WHERE` clause.
+> [native filter](../querying/filters.md) /
Review comment:
```suggestion
```
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
