Details
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Type:
Enhancement
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Status: Resolved (View Workflow)
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 25.2.0
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Component/s: Minion
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Security Level: Default (Default Security Scheme)
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Labels:None
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Sprint:Horizon 2019 - July 10th 2019, Horizon 2019 - July 17th 2019, Horizon 2019 - July 24th, Horizon 2019 - July 31st, Horizon 2019 - August 7th, Horizon 2019 - August 14th, Horizon 2019 - August 21st, Horizon 2019 - August 28th, Horizon 2020 - January 8th, Horizon 2020 - January 22nd
Description
We currently support off-heap storage for Sink messages on Minion when it can't reach the broker (added in https://issues.opennms.org/browse/NMS-10942).
The current solution uses H2 database as key value store (MVStore) for an in-memory (off-heap) solution. Some of the drawback of this solution are:
- Large memory overhead per message
- Messages are lost on when the Minion is restarted
We now have additional requirements to make the messages persist across Minion restarts, while continuing to make a best effort to preserve the order.
Here we explore options to replace the current H2 implementation with one that is backed by RocksDB.