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Extend write consistency factor text, reapply on client vs lower factor

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timvisee
2025-01-28 16:43:51 +01:00
parent 50efda6b34
commit f2f8ec6d82
1 changed files with 13 additions and 3 deletions
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qdrant-landing/content/documentation/guides/distributed_deployment.md
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@@ -1033,8 +1033,11 @@ Qdrant provides a few options to control consistency guarantees:
### Write consistency factor
The `write_consistency_factor` represents the number of replicas that must acknowledge a write operation before responding to the client. It is set to one by default.
It can be configured at the collection's creation time.
The `write_consistency_factor` represents the number of replicas that must acknowledge a write operation before responding to the client. It is set to 1 by default.
It can be configured at the collection's creation or when updating the
collection parameters.
This value can range from 1 to the number of replicas you have for each shard.
```http
PUT /collections/{collection_name}
@@ -1165,7 +1168,14 @@ client.CreateCollection(context.Background(), &qdrant.CreateCollection{
})
```
Write operations will fail if the number of active replicas is less than the `write_consistency_factor`.
Write operations will fail if the number of active replicas is less than the
`write_consistency_factor`. In this case, the client is expected to send the
operation again to ensure a consistent state is reached.
Setting the `write_consistency_factor` to a lower value may allow accepting
writes even if there are unresponsive nodes. Unresponsive nodes are marked as
dead and will automatically be recovered again once available to ensure data
consistency.
The configuration of the `write_consistency_factor` is important for adjusting the cluster's behavior when some nodes go offline due to restarts, upgrades, or failures.