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Limit types

  • Soft limit: meta_actor_cnt_per_worker_parallelism_soft_limit, defaults to 100. If exceeding this limit, creating materialized view, table, or sink can still succeed but will generate a SQL notice message when the statement returns.
  • Hard limit: meta_actor_cnt_per_worker_parallelism_hard_limit, defaults to 400. If exceeding this limit, creating materialized view, table, or sink will fail and generate an error message when the statement returns.

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Notes

  • The limit applies only when you create new materialized view, table, or sink. Existing database objects are unaffected.
  • To resolve issues related to these limits, consider scaling the cluster or reducing the streaming job parallelism.
  • Default limits may be adjusted in future releases.

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Override cluster limits

If it’s safe for the cluster to operate with limits exceeded, you can override the default behavior using one of the following methods:

  1. Bypass the limit check via session variable: SET bypass_cluster_limits TO true.
  2. Increase the limit via meta developer config:
[meta.developer]
meta_actor_cnt_per_worker_parallelism_soft_limit = 100
meta_actor_cnt_per_worker_parallelism_hard_limit = 400

Please be aware that once you bypass the check or increase the limits, the cluster could become overloaded, leading to issues with stability, availability, or performance.

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Examples

Create a materialized view exceeding the soft limit

CREATE MATERIALIZED VIEW test_cluster_limit_exceed_soft AS SELECT * FROM test;

----RESULT
NOTICE:
- Actor count per parallelism exceeds the recommended limit.
- Depending on your workload, this may overload the cluster and cause performance/stability issues. Scaling the cluster is recommended.
- Contact us via Slack or https://risingwave.com/contact-us/ for further enquiry.
- You can bypass this check via SQL `SET bypass_cluster_limits TO true`.
- You can check actor count distribution via SQL `SELECT * FROM rw_worker_actor_count`.
ActorCountPerParallelism { critical limit: 8, recommended limit: 7. worker_id_to_actor_count: ["1 -> WorkerActorCount { actor_count: 32, parallelism: 4 }"] }
CREATE_MATERIALIZED_VIEW

Create a materialized view exceeding the hard limit

CREATE MATERIALIZED VIEW test_cluster_limit_exceed_hard AS SELECT * FROM test;

----RESULT
ERROR:  Failed to run the query

Caused by:
  Protocol error:
- Actor count per parallelism exceeds the critical limit.
- Depending on your workload, this may overload the cluster and cause performance/stability issues. Please scale the cluster before proceeding!
- Contact us via Slack or https://risingwave.com/contact-us/ for further enquiry.
- You can bypass this check via SQL `SET bypass_cluster_limits TO true`.
- You can check actor count distribution via SQL `SELECT * FROM rw_worker_actor_count`.
ActorCountPerParallelism { critical limit: 7, recommended limit: 6. worker_id_to_actor_count: ["1 -> WorkerActorCount { actor_count: 32, parallelism: 4 }"] }