Hinted Handoff is a mechanism in ScyllaDB designed to ensure data consistency and availability. When a node is temporarily unavailable, ScyllaDB stores hints for the data that should have been written to that node. Once the node becomes available again, these hints are delivered, ensuring that the node is updated with the latest data.
When Hinted Handoff fails, you may observe error messages indicating that hints could not be delivered to a node. This typically occurs when a node is persistently unavailable, either due to it being down or because of network issues.
You might see log entries similar to:
ERROR [HintedHandoff:1] Hinted handoff failed for node X due to persistent unavailability.
The primary cause of Hinted Handoff failure is the persistent unavailability of a node. This can happen if the node is down or if there are network issues preventing communication between nodes.
To resolve this issue, follow these steps:
Ensure that the node is up and running. You can check the status of nodes using the nodetool status command:
$ nodetool status
Look for any nodes marked as 'DN' (Down) or 'UJ' (Unreachable).
Ensure that there are no network issues. Verify that all nodes can communicate with each other. Check firewall settings and network configurations.
If the node was down for an extended period, it might require a repair. Use the nodetool repair command to synchronize data:
$ nodetool repair
For more information on Hinted Handoff and troubleshooting, refer to the following resources:
By following these steps, you should be able to resolve Hinted Handoff failures and ensure that your ScyllaDB cluster remains consistent and available.
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