wanglijie95 commented on a change in pull request #18757:
URL: https://github.com/apache/flink/pull/18757#discussion_r809738524
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File path: docs/content/docs/deployment/elastic_scaling.md
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@@ -151,5 +151,45 @@ The behavior of Adaptive Scheduler is configured by [all
configuration options c
- **Unused slots**: If the max parallelism for slot sharing groups is not
equal, slots offered to Adaptive Scheduler might be unused.
- Scaling events trigger job and task restarts, which will increase the number
of Task attempts.
+## Adaptive Batch Scheduler
+
+The Adaptive Batch Scheduler can automatically decide parallelisms of
operators for batch jobs. If an operator is not set with a parallelism, the
scheduler will decide parallelism for it according to the size of its consumed
datasets. This can bring many benefits:
+- Batch job users can be relieved from parallelism tuning
+- Automatically tuned parallelisms can better fit consumed datasets which have
a varying volume size every day
+- Operators from SQL batch jobs can be assigned with different parallelisms
which are automatically tuned
+
+### Usage
+
+To automatically decide parallelisms for operators with Adaptive Batch
Scheduler, you need to:
+- Configure to use Adaptive Batch Scheduler.
+- Set the parallelism of operators to `-1`.
+
+#### Configure to use Adaptive Batch Scheduler
+To use Adaptive Batch Scheduler, you need to:
+- Set the [`jobmanager.scheduler`]({{< ref "docs/deployment/config"
>}}#jobmanager-scheduler) to `AdaptiveBatch`
+- Set the [`execution.batch-shuffle-mode`]({{< ref "docs/deployment/config"
>}}#execution-batch-shuffle-mode) to `ALL-EXCHANGES-BLOCKING`(default value)
due to ["ALL-EXCHANGES-BLOCKING jobs only"](#Limitations).
Review comment:
> Maybe use the anchor to the
subsection`#all-exchanges-blocking-jobs-only`?
`#all-exchanges-blocking-jobs-only` is not title, so can't link.
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