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timvisee
reviewed
Nov 11, 2024
| By default, the cluster continues to accept updates as long as at least one replica of each shard is online. However, this behavior means that once an offline replica is restored, it will require additional synchronization with the rest of the cluster. In some cases, this synchronization can be resource-intensive and undesirable. | ||
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| Setting the write_consistency_factor to match the replication factor modifies the cluster's behavior so that unreplicated updates are rejected, preventing the need for extra synchronization. | ||
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Maybe it would be nice to be a little bit more concrete on what happens:
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| If the update is applied to enough replicas - according to the `write_consistency_factor` - the update will return a successful status. Any replicas that failed to apply the update will be temporarily disabled and are automatically recovered to keep data consistency. If the update could not be applied to enough replicas, it'll return an error and may be partially applied. The user must submit the operation again to ensure data consistency. | |
Here I describe that the update will return a successful status if it was applied to enough replicas. That is not necessarily true if there are consensus problems. But I don't think we've to describe that edge case here.
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